emoji
utf8 编码问题 https://laravel-china.org/top...
function nickname_encode($s){
$chars = preg_split('//u', $s, null, PREG_SPLIT_NO_EMPTY);
foreach ($chars as &$c) {
if (strlen($c) > 3 || $c === "%"){
$c = urlencode($c);
}
}
return implode($chars);
}
解码直接用urldecode就行了。strtotime
var_dump(date("Y-m-d", strtotime("2017-06-31")));
//输出2017-07-01
var_dump(date("Y-m-d", strtotime("-1 month", strtotime("2017-03-31"))));
//输出2017-03-03
var_dump(date("Y-m-d", strtotime("+1 month", strtotime("2017-08-31"))));
//输出2017-10-01
var_dump(date("Y-m-d", strtotime("next month", strtotime("2017-01-31"))));
//输出2017-03-03
var_dump(date("Y-m-d", strtotime("last month", strtotime("2017-03-31"))));
//输出2017-03-03
var_dump(date("Y-m-d", strtotime("last day of -1 month", strtotime("2017-03-31"))));
//输出2017-02-28
var_dump(date("Y-m-d", strtotime("first day of +1 month", strtotime("2017-08-31"))));
////输出2017-09-01
var_dump(date("Y-m-d", strtotime("first day of next month", strtotime("2017-01-31"))));
////输出2017-02-01
var_dump(date("Y-m-d", strtotime("last day of last month", strtotime("2017-03-31"))));
////输出2017-02-28
需要获得多少天之前 $day
mktime(0, 0, 0, date("m", $startTime), date("d", $startTime) - $day, date("Y", $startTime));
这个坑在carbon中一样的有. 比如:Carbon::now()->subMonth(1)->startOfMonth() 一样的会出现上面说的问题. 你必须这样写:Carbon::now()->startOfMonth()->subMonth(1)
Carbon::now()->subMonthNoOverflow(1)->startOfMonth()
https://laravel-china.org/articles/17317
$i = 12;
while($i >= 1) {
echo date('Y-m', strtotime('-' . $i . ' month', strtotime('2018-8'))) . "\n";
$i--;
}https://laravel-china.org/art...
解决方法
??
运算符可 用于判断$a变量不存在的情况（也可用于数组），而使用三元运算符判断一个未定义的变量，PHP会抛出异常。也正是因为这样，用??判断一个赋值为0的变量的时候结果是不一样的。https://laravel-china.org/articles/17304?#reply64712
$a=0;
$c=1;
$b=$a??$c;
echo 'a:'.$a.',b:'.$b.',c:'.$c;
//a:0,b:0,c:1
$a=0;
$c=1;
$b=$a?$a:$c;
echo 'a:'.$a.',b:'.$b.',c:'.$c;
//a:0,b:1,c:1Error while reading line from the server. [tcp://127.0.0.1:6379]
redis 加了代理 Twemproxy，而 predis 对这个配置默认执行 select 操作，导致了连接错误。
大家以后要注意，如果 redis 有代理的话，别忘了把 'database' => 0,这个配置删掉。
https://laravel-china.org/top...
PHP empty 函数判断结果为空
class person
{
protected $attributes = [];
public function __construct(array $attributes)
{
$this->attributes = $attributes;
}
public function __get($name)
{
return $this->attributes[$name] ?? null;
}
}
https://laravel-china.org/articles/12530/the-shock-php-empty-function-is-empty-but-the-actual-value-is-nonempty
https://laravel-china.org/topics/3021/isset-is-not-right-after-upgrading-php7
var_dump(
$person->firstName,
empty($person->firstName),
isset($person->firstName),
is_null($person->firstName)
);Laravel Redis 多个进程同时取队列问题
Laravel 使用 Redis 的 list 作为队列的数据结构，并会为每个队列分配一个 ID
Laravel 中入队列方法
public function pushRaw($payload, $queue = null, array $options = [])
{
$this->getConnection()->rpush($this->getQueue($queue), $payload);
return Arr::get(json_decode($payload, true), 'id');
}
用的是 Redis 的 rpush 命令。
Laravel 中取队列方法
public function pop($queue = null)
{
$original = $queue ?: $this->default;
$queue = $this->getQueue($queue);
$this->migrateExpiredJobs($queue.':delayed', $queue);
if (! is_null($this->expire)) {
$this->migrateExpiredJobs($queue.':reserved', $queue);
}
list($job, $reserved) = $this->getConnection()->eval(
LuaScripts::pop(), 2, $queue, $queue.':reserved', $this->getTime() + $this->expire
);
if ($reserved) {
return new RedisJob($this->container, $this, $job, $reserved, $original);
}
}
这里用的是 lua 脚本取队列，如下：
public static function pop()
{
return <<<'LUA'
local job = redis.call('lpop', KEYS[1])
local reserved = false
if(job ~= false) then
reserved = cjson.decode(job)
reserved['attempts'] = reserved['attempts'] + 1
reserved = cjson.encode(reserved)
redis.call('zadd', KEYS[2], ARGV[1], reserved)
end
return {job, reserved}
LUA;
}那么结论是：从 Laravel 的处理方式和打印的日志结果看，即使多个进程读取同一个队列，也不会读取到一样的数据。
队列执行失败之后根本不会执行failed方法
执行队列侦听器时加上 --tries参数即可，failed()方法只有在重试指定次数完成后才会调用failed()方法如：
http://blog.zhouchenxi.cn/pos...
php artisan queue:listen --queue=default,listeners --tries=3
顺便提一下：如果指定了队列名称必须在侦听器的参数上加上 --queue参数才行，不然没有指定的队列是不会运行的。
event 指定队列
public $queue = 'listeners';
public function queue($queue, $job, $data)
{
if (isset($this->queue, $this->delay)) {
return $queue->laterOn($this->queue, $this->delay, $job, $data);
}
if (isset($this->queue)) {
return $queue->pushOn($this->queue, $job, $data);
}
if (isset($this->delay)) {
return $queue->later($this->delay, $job, $data);
}
return $queue->push($job, $data);
}php7不支持 preg_replace e修正符
车轮升级PHP7踩过的一些坑 http://php.swoole.com/wiki/%E...
php5 php7不兼容的地方：https://segmentfault.com/a/11...
$joinStr = preg_replace("/__([A-Z_-]+)__/e",$prex.".strtolower('$1')",$joinStr);
//替换为
preg_replace_callback("/__([A-Z_-]+)__/",function($r) use (&$joinStr){
$joinStr = $prex.strtolower($r[1]);
},$joinStr);内存溢出
//https://laravel-china.org/articles/16312/handling-large-amounts-of-data-to-write-files-to-avoid-memory-overflow-and-response-timeout
$beginIndex = 0;
$pageLimit = 50000;
$endIndex = $beginIndex + $pageLimit;
while ($pageData = \DB::connection('hub_log')->select("SELECT * FROM `{$tableName}` WHERE id > {$beginIndex} and id <= {$endIndex}")) {
foreach ($pageData as $row) {
file_put_contents(storage_path('mcd_rawdata/'.$tableName.'.txt'), $row->Content . "\n", FILE_APPEND);
}
$beginIndex += $pageLimit;
$endIndex += $pageLimit;
}
$public_path = $time.'test.txt';
DB::table('20171220')->orderBy('id')->chunk(10000,function($data) use ($public_path){
$arr = '';
foreach ($data->toArray() as $key => $value) {
$arr .= $value->Content."\n";
}
file_put_contents(public_path($public_path),$arr, FILE_APPEND);
unset($data);unset($arr);
});git bash 输入python命令停滞
$ python -i
$ winpty python -3
保留两位小数
round(a,2)
r = lambda f: f - f % 0.01
int(a*100)/100
print("%.2f" %a)
后期绑定
https://www.v2ex.com/t/482659...
def testFun():
return(lambda x : i*x for i in range(4))
for everyLambda in testFun():
print(everyLambda(2))
& python test.py
0
2
4
6
def testFun():
temp = [lambda x : i*x for i in range(4)]
return temp
for everyLambda in testFun():
print(everyLambda(2))
& python test.py
6
6
6
6
第一个是括号(), 为生成器, 返回 generator
第二个是中括号[], 为列表生成式, 返回数组 列表表达式是即时计算的, 而生成器是迭代时才会计算{} + []
({}).valueOf() // []
// 返回来的是个对象,继续调用 toString https://www.v2ex.com/t/480998#reply11
[].toString() // ""
[] + 1// "1"
[] + 'a' // "a"echo 后发送 header
使用 fastcgi_finish_request();（ PHP-fpm ）可以强制断开客户端连接 session 本质上是 header set-cookie，所以不算输出。这里的输出指的是 response body 的部分
https://www.v2ex.com/t/481127...
isset在php5.6-和php7.0+的一些差异
https://segmentfault.com/a/1190000016097997
class ProductCategory
{
const TYPES = [
1 => 'type1',
2 => 'type2',
];
public function getType()
{
return isset(self::TYPES[$this->type]) ? self:TYPES[$this->type] : 'unrecognized_type';
}
}
//把汉字拆分为数组
function ch2arr($str)
{
return preg_split('//u', $str, null, PREG_SPLIT_NO_EMPTY);
}laravel 中使用 导出 excel 时报错
PHPExcel_Calculation_Exception: Q5!A65 → Formula Error: An unexpected error occured in /application/www/web_git-pull/vendor/phpoffice/phpexcel/Classes/PHPExcel/Cell.php:291
原因：
在excel中一个单元格如果是以=开头，则说明这个单元格是根据其他单元格的值算出来的，=后面必须跟着一个合法的表达式,而那个字符串是用户的输入，很明显不应该是一个合法的表达式，所以应该在代码中过滤掉
解决：$str = "\t".$str;//同时解决 如 11111111111 显示成 1.11111E+29
参考
https://github.com/Maatwebsit...
https://stackoverflow.com/que...
gzip UnicodeDecodeError
import urllib.request
import gzip
# 注意要先读取内容才可以解压缩
data = urllib.request.urlopen(url).read()
try:
html =data.decode("utf-8")
except:
html =gzip.decompress(data).decode("utf-8")
Intervention/Image 图片写入中文
https://laravel-china.org/topics/13642/problems-encountered-in-writing-chinese-with-interventionimage-pictures-and-solutions
function to_unicode($string)
{
$str = mb_convert_encoding($string, 'UCS-2', 'UTF-8');
$arrstr = str_split($str, 2);
$unistr = '';
foreach ($arrstr as $n) {
$dec = hexdec(bin2hex($n));
$unistr .= '&#' . $dec . ';';
}
return $unistr;
}获取某字段修改前的值
Issue::saving(function(Issue $issue){
if ($issue->isDirty('title')) {
$user = Auth::user()->username;
$oldTitle = $issue->getOriginal('title'); // 原始值
$newTitle = $issue->title; // 新值
ActionLog::log("$user 把标题 $oldTitle 修改为 $newTitle");
}
});前一天
https://www.cnblogs.com/lhm166/articles/6066762.html
$mytime=mktime(0, 0, 0, date('m'), date('d')-1, date('Y'));//获取时间戳
$mytime=date("Y-m-d H:i:s", strtotime("-1 day")); //获取格式为2016-12-30 13:26:13
$timetoday = strtotime(date("Y-m-d",time()));
function mdate($time = NULL) {
$text = '';
$time = $time === NULL || $time > time() ? time() : intval($time);
$t = time() - $time; //时间差 （秒）
$y = date('Y', $time)-date('Y', time());//是否跨年
switch($t){
case $t == 0:
$text = '刚刚';
break;
case $t < 60:
$text = $t . '秒前'; // 一分钟内
break;
case $t < 60 * 60:
$text = floor($t / 60) . '分钟前'; //一小时内
break;
case $t < 60 * 60 * 24:
$text = floor($t / (60 * 60)) . '小时前'; // 一天内
break;
case $t < 60 * 60 * 24 * 3:
$text = floor($time/(60*60*24)) ==1 ?'昨天 ' . date('H:i', $time) : '前天 ' . date('H:i', $time) ; //昨天和前天
break;
case $t < 60 * 60 * 24 * 30:
$text = date('m月d日 H:i', $time); //一个月内
break;
case $t < 60 * 60 * 24 * 365&&$y==0:
$text = date('m月d日', $time); //一年内
break;
default:
$text = date('Y年m月d日', $time); //一年以前
break;
}
return $text;
}function friend_date($time)
{
if (!$time)
return false;
$fdate = '';
$d = time() - intval($time);
$ld = $time - mktime(0, 0, 0, 0, 0, date('Y')); //得出年
$md = $time - mktime(0, 0, 0, date('m'), 0, date('Y')); //得出月
$byd = $time - mktime(0, 0, 0, date('m'), date('d') - 2, date('Y')); //前天
$yd = $time - mktime(0, 0, 0, date('m'), date('d') - 1, date('Y')); //昨天
$dd = $time - mktime(0, 0, 0, date('m'), date('d'), date('Y')); //今天
$td = $time - mktime(0, 0, 0, date('m'), date('d') + 1, date('Y')); //明天
$atd = $time - mktime(0, 0, 0, date('m'), date('d') + 2, date('Y')); //后天
if ($d == 0) {
$fdate = '刚刚';
} else {
switch ($d) {
case $d < $atd:
$fdate = date('Y年m月d日', $time);
break;
case $d < $td:
$fdate = '后天' . date('H:i', $time);
break;
case $d < 0:
$fdate = '明天' . date('H:i', $time);
break;
case $d < 60:
$fdate = $d . '秒前';
break;
case $d < 3600:
$fdate = floor($d / 60) . '分钟前';
break;
case $d < $dd:
$fdate = floor($d / 3600) . '小时前';
break;
case $d < $yd:
$fdate = '昨天' . date('H:i', $time);
break;
case $d < $byd:
$fdate = '前天' . date('H:i', $time);
break;
case $d < $md:
$fdate = date('m月d日 H:i', $time);
break;
case $d < $ld:
$fdate = date('m月d日', $time);
break;
default:
$fdate = date('Y年m月d日', $time);
break;
}
}
return $fdate;
}phpstorm xdebug
https://www.cnblogs.com/baoch...
https://www.cnblogs.com/niuxi...
https://laravel-china.org/top...
https://laravel-china.org/art...
https://laravel-china.org/art...
如果出现Can't start listening for connections from 'xdebug': Port 9000 is busy
可修改端口号，要修改两个地方
第一个地方是刚才php.ini里面的xdebug.remote_port=9000
第二个地方是phpstorm - setting - Languages&Frameworks - 相应的语言（比如PHP） - debug - 修改里面的Debug port
Python for 循环中的陷阱
https://www.v2ex.com/t/470443...
pyinstaller 打包 exe
pyinstaller -p venv_path (中间一定要有空格) you.py https://www.v2ex.com/t/476247...
http://ju.outofmemory.cn/entr...
php捕获fatal error
function fatal_handler() {
$errfile = "unknown file";
$errstr = "shutdown";
$errno = E_CORE_ERROR;
$errline = 0;
$error = error_get_last();
if($error){
//发送邮件队列也可以http://www.iamtb.cn/2017/11/17/php-catch-fatel-error/
file_put_contents('./testerror11.txt', json_encode($error));
}
}
register_shutdown_function("fatal_handler");
try{
$db=new db();
}catch(Exception $e){
echo $e->error_msg();
}PHP7开始，含十六进制字符串不再被认为是数字
$str = "0xffff";//https://segmentfault.com/q/1010000004829059
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
if (false === $int) {
throw new Exception("Invalid integer!");
}
var_dump($int); // int(65535)
$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));
var_dump($t1,$t2);php artisan config:cache
cat config/sentry.php
return array(
'dsn' => env('SENTRY_LARAVEL_DSN'),
// capture release as git sha
// 'release' => trim(exec('git log --pretty="%h" -n1 HEAD')),
// Capture bindings on SQL queries
'breadcrumbs.sql_bindings' => true,
// Capture default user context
'user_context' => false,
//transport function
'transport'=>function(Raven_Client $raven_Client,&$data){
$raven_Client->setTransport(null);
$raven_Client->close_curl_resource();
\Queue::pushOn('sentry',new \App\Commands\sentry($raven_Client,$data));
},
);
'transport'=>new \app\SentryTransport(),
class SentryTransport
{
public static function __set_state($arr){
return function($raven_Client,&$data){
\Queue::pushOn('sentry',new \App\Commands\sentry($raven_Client,$data));
};
}
}curl超时
//重试
$ch = curl_init();
// curl_setopt ($ch, CURLOPT_URL, 'produc_redis.php.com');
curl_setopt ($ch, CURLOPT_URL, '11.11.11.1');
https://segmentfault.com/a/1190000011188541
// I changed UA here
curl_setopt ($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt ($ch, CURLOPT_AUTOREFERER, true);
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 2);
$html = curl_exec($ch);
var_dump($html,curl_error($ch));
$num=3;
for($i=1;$i<=$num;$i++){
if(curl_getinfo($ch,CURLINFO_HTTP_CODE)=='0' && $i<=$num){
echo "retry $i 次".PHP_EOL;
if($i==3){
curl_setopt ($ch, CURLOPT_URL, '220.181.57.217');
}
$html = curl_exec($ch);
}
}
var_dump($html);
var_dump(curl_error($ch));
// var_dump(curl_getinfo($ch));
/**
* curl请求
*https://segmentfault.com/a/1190000010197068
* @param $url
* @param string $postData
* @param int $timeout
* @return array|mixed
* @throws Exception
*/
protected static function post($url, $postData = '', $timeout = 5)
{
$ret = array();
$times = 5;
do {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HEADER, false);
if ($postData != '') {
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
// 重要, 该处不能丢 curl 执行最大秒数
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
$output = curl_exec($ch);
if ($errNo = curl_errno($ch)) {
error_log("Error [$errNo]: " . curl_error($ch));
} else {
$ret = json_decode($output, true);
// 解析的结果集为空时停止查询
if (!is_array($ret) && !trim($ret)) {
throw new Exception(__METHOD__ . ": cURL调用失败, 信息为: " . $output);
}
unset($output);
}
curl_close($ch);
if (isset($ret[0]) && $ret[0]) {
return $ret;
}
} while ($times--);
exit(__METHOD__ . ": cURL请求重试至 {$times} 次后仍无响应, 执行退出");
}cURL error 28
cURL error 28: See http://curl.haxx.se/libcurl/c/libcurl-errors.html
$client=new GuzzleHttp\Client();
try {
$tmp = $client->get($url,array("timeout"=>3,"connect_timeout"=>3));
$res = json_decode(strval($tmp->getBody()),1);
} catch (\Exception $e) {
$res = [];
\Log::info('error', ['url' => $url, 'msg' => $e->getMessage()]);
}
$client=new GuzzleHttp\Client();
$requests=[
$client->createRequest('GET',$url,["timeout"=>3,"connect_timeout"=>3]),
$client->createRequest('GET',$url2,["timeout"=>3,"connect_timeout"=>3]),
];
$result = Pool::batch($client, $requests, ['pool_size' => 2]);
//$result->getResult($requests[0]) instanceof GuzzleHttp\Message\Response
if ($result[0] instanceof Response && $result[0]->getStatusCode() == 200) {
$data = json_decode($result[0]->getBody(), true);
}
格式化
import prettytable as pt
https://www.v2ex.com/t/483984#reply15
## 按行添加数据
tb = pt.PrettyTable()
tb.field_names = ["City name", "Area", "Population", "Annual Rainfall"]
tb.add_row(["Adelaide",1295, 1158259, 600.5])
tb.add_row(["Brisbane",5905, 1857594, 1146.4])
tb.add_row(["Darwin", 112, 120900, 1714.7])
tb.add_row(["Hobart", 1357, 205556,619.5])
print(tb)
#str.ljust 和 rjust 才是王道，谁用谁知道！
+-----------+------+------------+-----------------+
| City name | Area | Population | Annual Rainfall |
+-----------+------+------------+-----------------+
| Adelaide | 1295 | 1158259 | 600.5 |
| Brisbane | 5905 | 1857594 | 1146.4 |
| Darwin | 112 | 120900 | 1714.7 |
| Hobart | 1357 | 205556 | 619.5 |
+-----------+------+------------+-----------------+unicode
Unicode 每个字符的详情，可以查官方文档： https://www.unicode.org/charts/
python2 代码：
for i in range(0x005b,0x005f):
print (unichr(i))#print (chr(i))
python3 代码请查看 http://www.chenxm.cc/post/683...
unicode 字符表示方法 u + 16 进制数值,例如 u0001 print(''.join(chr(u) for u in range(0, 0x41))) u0040 这里 0040 就是 16 进制的，range 是左闭右开的，所以u0020-u0040 的码点范围是 range(0x00, 0x40+1)
0b 二进制 0o 八进制 0x 16 进制
0b10 // 2
0o10 // 8
0x10 // 16
unicode 字符表示方法 u + 16 进制数值,例如 u0001
print(u'u0061') // ahttps://www.v2ex.com/t/484923...
laravel更新后读取数据失败
https://laravel-china.org/articles/16566/take-a-laravel-mysql-to-verify-the-experience-of-bug#reply62596
//创建数据
$meeting = meeting::create($data);
//查询数据
$meeting = meeting::findOrFail($meeting->id);
//纪录操作日志
Log::insert($meeting);
线上数据库是读写分离的，主库写入，但更新数据后马上查询，从库可能没来得及更新数据
当网络不好时遇到从库更新不及时 findOrFail 就会报 404，导致后面所有操作都失效，自然验证也失效了
解决方法
更新完后，查询指定使用主库
更新后禁止查询，直接使用 create 返回的 model 实例，对于数据库中的有默认值的字段，手动加入到 model 实例中批量更新
//https://laravel-china.org/topics/6864/how-to-batch-update-accumulate-a-field
https://laravel-china.org/articles/16620/laravel-project-execl-batch-import-database-data-update-data-no-insertion
$arr = [
// user_id => reward
'1' => 50,
'2' => 30,
'3' => 60
];
User::find(array_keys($arr))->each(function ($query) use ($arr) {
$query->increment('award' , $arr[$query->id]);
});
# 批量更新相同的 award
User::find(array_keys($arr))->each->increment('award', 30);
/**
* 批量更新表的值，防止阻塞
* @note 生成的SQL语句如下：
* update mj_node set sort = case id
* when 13 then 1
* when 1 then 4
* when 7 then 5
* when 8 then 6
* when 9 then 7
* when 10 then 8
* when 11 then 9
* when 12 then 10
* end where id in (13,1,7,8,9,10,11,12)
* @param $conditions_field 条件字段
* @param $values_field 需要被更新的字段
* @param $conditions
* @param $values
* @return int
*/
public function batchUpdate($conditions_field, $values_field, $conditions, $values)
{
$table = $this->model->getFullTableName();//返回完整表名，自己在项目中定义
$sql = 'update ' . $table . ' set '. $values_field .' = case ' .$conditions_field;
foreach ($conditions as $key => $condition) {
$sql .= ' when ' . $condition . ' then ?';
}
$sql .= ' end where id in (' . implode(',', $conditions) . ')';
return DB::update($sql, $values);//项目中需要引入DB facade
}cat 多换行
https://www.v2ex.com/t/188162
调试shell脚本可以使用 sh -x ****.sh，有详细输出内容
Bash的echo默认在末尾加了换行符"\n"，所以你cat那个文件多了一个换行符，给echo加上-n参数就能不自动加换行符了。
var= cat tmp.txt;echo $var"abc" 改成如下的形式
var= `cat tmp.txt`;echo $var"abc"或者 #注意不是单引号，是tab键上面1前面的那个符号
var=$(cat tmp.txt);echo $var"abc"grep and or
https://blog.csdn.net/jackaduma/article/details/6900242
grep -E 'Tech|Sales' employee.txt
grep -v 'pattern1' filename
$ grep -E 'Manager.*Sales|Sales.*Manager' employee.txt # -E 'pattern1.*pattern2'
egrep "php.*artisan.*$1"
egrep 'pattern1|pattern2' filenamememcached 默认的过期时间则 不能大于 30 天
https://laravel-china.org/top...
cron 内容最后一行未回车
https://segmentfault.com/a/11... crontab -u www -e
unix:///tmp/supervisor.sock refused connection
[root@localhost supervisor]# supervisorctl -c /etc/supervisord.conf
unix:///tmp/supervisor.sock refused connection
supervisor> exit
rm -f /tmp/supervisor.sock
[root@localhost supervisor]# ps aux|grep super
root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers]
root 8246 0.0 0.1 208064 13404 ? Ss 18:17 0:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf
supervisord是服务端，是个deamon，supervisorctl是客户https://www.v2ex.com/t/210122
修改supervisor.conf文件后，要执行supervisorctl reload，重新加载配置文件
vi artisan.conf
[root@localhost supervisor]# supervisorctl status
unix:///tmp/supervisor.sock no such file
[root@localhost supervisor]# ps aux|grep super
root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers]
root 19472 0.0 0.0 103256 844 pts/5 S+ 19:57 0:00 grep super
[root@localhost supervisor]# supervisord -c /etc/supervisord.conf
Error: Invalid user name www in section 'program:artisan_queue' (file: '/etc/supervisor/artisan.conf')
For help, use /usr/bin/supervisord -h
[root@localhost supervisor]# vi /etc/supervisor/artisan.conf
[root@localhost supervisor]# supervisord -c /etc/supervisord.conf
[root@localhost supervisor]# supervisorctl status
artisan_queue BACKOFF Exited too quickly (process log may have details)
http://blog.51cto.com/jxlwc/2112062
https://www.jianshu.com/p/3658c963d28bSpecified key was too long
https://laravel-china.org/articles/17094/larave-admin-installation?#reply64528
默认的数据库字符集，现在utf8mb4包括存储emojis支持。如果你运行MySQL v5.7.7或者更高版本，则不需要做任何事情。
https://laravel-china.org/articles/4195/laravel-54-common-error-specified-key-was-too-long
https://segmentfault.com/a/1190000008416200
把config下的database.php下的mysql设置中,将'strict' => false就行了..
Schema::defaultStringLength(191); 是设置好的默认的字符串长度，也就是说，迁移中的字段没有设置长度的话，varchar 字段会被默认成长度只有 191
use Illuminate\Support\Facades\Schema;
public function boot()
{
Schema::defaultStringLength(191);
}laravel with 查询中只查询个别字段
select 的时候没有 id 的话就会为 null https://laravel-china.org/articles/17379
public function brand()
{
return $this->belongsTo(Brand::class, 'brandId')->select('id', 'briefCode');
}
$result = Brand::with(['brand' => function($query){
$query->select('id', 'briefCode');
}])->get();PHP输出A到Z
for($i='A'; $i<='Z'; $i++)
{
echo $i . '<br>';
}
for($i=ord('A'); $i<=ord('Z'); $i++)
{
echo chr($i) . '<br>';
}
for($i = 'A'; $i != 'BB'; $i++)
{
echo $i . '<br>';
}
$al = 'A';
while($al != 'BB')
{
echo $al++ . '<br>';
}env函数的小坑
dump(env('APP_ENV') === null); // true
因为没有执行 config:cache 命令，而项目上线后为了优化访问速度，生成了缓存文件，导致env取值失败
如果使用了config:cache，env函数只能在config目录下的配置文件的php里使用，不可以在其他地方使用。
一个非常简单的办法就是将
env('APP_ENV')改为config('app.env')
config函数会优先读取 bootstrap/cache/config.php 中缓存的配置，如果没有缓存文件，则会直接读取 config 目录下的所有配置文件
https://www.jianshu.com/p/83f9cd407751任务调度的列表
//1. 加载Console内核
app()->make(\Illuminate\Contracts\Console\Kernel::class);
//2. 获取计划任务列表
$scheduleList = app()->make(\Illuminate\Console\Scheduling\Schedule::class)->events();在模型事件中获取某字段修改前的值
Issue::saving(function(Issue $issue){
if ($issue->isDirty('title')) {
$user = Auth::user()->username;
$oldTitle = $issue->getOriginal('title'); // 原始值https://laravel-china.org/wikis/16169
$newTitle = $issue->title; // 新值
ActionLog::log("$user 把标题 $oldTitle 修改为 $newTitle");
}
});laravel SerializesModels
因为我们在任务类里引用了 SerializesModels 这个 trait，使得 Eloquent 模型在处理任务时可以被优雅地序列化和反序列化。如果你的队列任务类在构造器中接收了一个 Eloquent 模型，那么只有可识别出该模型的属性会被序列化到队列里。当任务被实际运行时，队列系统便会自动从数据库中重新取回完整的模型。这整个过程对你的应用程序来说是完全透明的，这样可以避免在序列化完整的 Eloquent 模式实例时所带来的一些问题。https://laravel-china.org/top...
composer require失败
cat composer.json
"monolog/monolog": "^2.0@dev",
$ composer require dees040/laravel-api-responses
1/1: https://packagist.laravel-china.org/p/provider-latest$0449728151603 e355a0ee137fb34881e699652e41e3e1de11ba9c4ea7a47a312.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
Using version dev-master for dees040/laravel-api-responses
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- The requested package monolog/monolog (locked at 1.23.0, required as ^2.0@dev ) is satisfiable by monolog/monolog[1.23.0] but these conflict with your requiremen ts or minimum-stability.
Problem 2
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- Can only install one of: monolog/monolog[2.x-dev, 1.x-dev].
- Installation request for monolog/monolog ^2.0@dev -> satisfiable by monolog/m onolog[2.x-dev].
- Installation request for laravel/framework (locked at v5.5.42, required as 5. 5.*) -> satisfiable by laravel/framework[v5.5.42].
$composer require "monolog/monolog:~1.12"
1/1: https://packagist.laravel-china.org/p/provider-latest$d12a81f48a3e1dad512c1d2c375298e3a8ea414dff5000d5f345939429c6b29b.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/monolog/monolog/c465e1144536862e03f519cb3d65e924062cabfb.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Package operations: 0 installs, 1 update, 0 removals
- Removing monolog/monolog (1.23.0)
- Installing monolog/monolog (1.x-dev c465e11):
Cloning c465e11445 from cache
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover
Discovered Package: 96qbhy/hyid
Discovered Package: appstract/laravel-opcache
Discovered Package: appstract/lush-http
Discovered Package: barryvdh/laravel-debugbar
Discovered Package: barryvdh/laravel-dompdf
Discovered Package: barryvdh/laravel-ide-helper
Discovered Package: base62/base62
Discovered Package: cblink/laravel-excel-zip
Discovered Package: cblink/laravel-sso
Discovered Package: chumper/zipper
Discovered Package: encore/laravel-admin
Discovered Package: encore/redis-manager
Discovered Package: fideloper/proxy
Discovered Package: foryoufeng/laravel-generator
Discovered Package: ibrand/laravel-miniprogram-poster
Discovered Package: intervention/image
Discovered Package: itsgoingd/clockwork
Discovered Package: jacobcyl/ali-oss-storage
Discovered Package: jellybool/flysystem-upyun
Discovered Package: jenssegers/agent
Discovered Package: jenssegers/mongodb
Discovered Package: laravel-admin-ext/helpers
Discovered Package: laravel/tinker
Discovered Package: latrell/lock
Discovered Package: lubusin/laravel-decomposer
Discovered Package: maatwebsite/excel
Discovered Package: nesbot/carbon
Discovered Package: overtrue/laravel-query-logger
Discovered Package: overtrue/laravel-socialite
Discovered Package: prettus/l5-repository
Discovered Package: sentry/sentry-laravel
Discovered Package: simplesoftwareio/simple-qrcode
Discovered Package: spatie/laravel-tail
Discovered Package: tymon/jwt-auth
Discovered Package: zgldh/qiniu-laravel-storage
Package manifest generated successfully.
$ composer require dees040/laravel-api-responses
1/1: https://packagist.laravel-china.org/p/provider-latest$14d9ca1b35af157c565d6c564cde71c59043d7457135c5a4317471625a1db2e7.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
Using version dev-master for dees040/laravel-api-responses
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/dees040/laravel-api-responses/9aec7eb323fc45e17f1dbb9c6e203d240836f91b.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Package operations: 1 install, 0 updates, 0 removals
- Installing dees040/laravel-api-responses (dev-master 9aec7eb): Cloning 9aec7eb323 from cache
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover
$ composer require phpoffice/phpspreadsheet
1/2: https://packagist.laravel-china.org/p/provider-latest$8512051929ea08e8189e440a1f5293135717f61525e93d6f4577794143032dd5.json
2/2: https://packagist.laravel-china.org/p/provider-2018-10$4f971ac341cf575b7ed47aa09773abb926ec0c2baad56a0da2c9eed868beb649.json
Finished: success: 2, skipped: 0, failure: 0, total: 2
Using version dev-master for phpoffice/phpspreadsheet
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- Installation request for maatwebsite/excel (locked at 3.0.9) -> satisfiable by maatwebsite/excel[3.0.9].
Installation failed, reverting ./composer.json to its original content.
suping3@BJ-D-212361A MINGW64 /d/code/blog
$ composer require "phpoffice/phpspreadsheet:^1.2"
1/3: https://packagist.laravel-china.org/p/provider-2018-10$edb575ac09ff566f26e69fb52521dbd7b5bd90cb0e97c11c04a834f1ba157b0b.json
2/3: https://packagist.laravel-china.org/p/provider-latest$f7aba8aec5290950424531a654a2519842e07f0dcd995755aa8e64e7f622ad17.json
3/3: https://packagist.laravel-china.org/p/provider-2018-07$1f1ac5377ce1027162f91a3db54217c36e38f7ae18744629e6e89c5e6d410c78.json
Finished: success: 3, skipped: 0, failure: 0, total: 3
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/phpoffice/phpspreadsheet/2dfd06c59825914a1a325f2a2ed13634b9d8c411.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Fatal error: Class 'PHPUnit_Framework_TestCase' not found
https://github.com/dees040/laravel-api-responses/issues/2
vi vendor/dees040/laravel-api-responses/tests/ResponseTest.php
class ResponseTest extends \PHPUnit\Framework\TestCase
$ phpunit vendor/dees040/laravel-api-responses/tests/ResponseTest.php
PHPUnit 6.5.3 by Sebastian Bergmann and contributors.
.............. 14 / 14 (100%)
Time: 378 ms, Memory: 16.00MBLaravel 的 collection
$collection = new \Illuminate\Database\Eloquent\Collection(['item a', 'item b', 'item c']);
$collection = $collection->unique();
执行时候会报错
PHP Fatal error: Call to a member function getKey() on string in /Project/nginx/webbpm-dev.ssl.lol/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Collection.php on line 259
[Symfony\Component\Debug\Exception\FatalErrorException]
Call to a member function getKey() on string
这是因为 Illuminate\Database\Eloquent\Collection 通过调用自身的 getDictionary 方法，使用根据主键去重复的逻辑覆盖了 Illuminate\Support\Collection 的逻辑。
以上代码改成https://laravel-china.org/topics/18696
$collection = collect(['item a', 'item b', 'item c']);
$collection = $collection->unique();使用"mews/captcha:~2.0" 验证码图片不显示问题
Symfony\Component\Debug\Exception\FatalThrowableError: Call to undefined function Intervention\Image\Gd\imagettfbbox() in file /usr/share/nginx/html/LaraBBS/vendor/intervention/image/src/Intervention/Image/Gd/Font.php on line 85
如果已经开启了gd，请参考下 https://laravel-china.org/articles/18815?#reply69185
FROM php:7.0-fpm
RUN apt-get update && apt-get install -y \
libfreetype6-dev \
libjpeg62-turbo-dev \
libmcrypt-dev \
libpng-dev \
&& docker-php-ext-install -j$(nproc) iconv mcrypt \
&& docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
&& docker-php-ext-install -j$(nproc) gd在解析外部变量时的一个问题
//https://segmentfault.com/a/1190000017051950
<form method="post">
<input type="text" name="id[]" value="1">
<input type="text" name="id[]_text" value="a">
<input type="text" name="id[]" value="2">
<input type="text" name="id[]_text" value="b">
<input type="submit">
</form>
var_export($_POST);
array (
'id' =>
array (
0 => '1',
1 => 'a',
2 => '2',
3 => 'b',
),
)
$foo["id"] = 1;
$foo["id[]_text"] = 2;
var_export($foo);
extract($foo);
var_export(get_defined_vars());Laravel with () limit
比如如何取得每篇文章中的前10条评论
下面为错误写法：https://laravel-china.org/articles/19932
essay::with(['comment' => function($query) {
$query->take(10)
}])
public function products()
{
return $this->belongsToMany(Hproduct::class,'hproduct_has_type','type_id','product_id');
}
public function topTenproducts()
{
return $this->products()->with('supplier')->where('is_sale','=',1)->limit(4);
}
public function getProdcutsWithtopTenproducts($col)
{
$model = $this->whereIn('id',$col)->get();
$model->each(function ($model) {
$model->load('topTenproducts');
});
return $model->toArray();
}laravel 5.5 索引长度超过限制
laravel5.4中改变了默认的编码类型(utf8 => utf8mb4), 从而使email字段索引长度超过了的默认限制长度 https://laravel-china.org/articles/18306
InnoDB 引擎中：
uft8 varchar 最大长度 255
utf8mb4 varchar 最大长度 191
设置一下 varchar 的长度不超过 191 即可
table->string('email')->index(); varchar会使用utf8mb4编码, utf8mb4编码(4bytes)属于utf8编码(3bytes)的扩展类型,
由此可以计算索引长度为255*4+2=1022 >767
$ php artisan migrate
Migration table created successfully.
In Connection.php line 664:
SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was t
oo long; max key length is 1000 bytes (SQL: alter table `users` add unique
`users_email_unique`(`email`))
golang序列化失败
ret, _ := json.Marshal(result)//https://www.hchstudio.cn/article/2018/2622/
发现是结构体定义有问题，当定义结构体时首字母必须大写才能序列化成功，这个特点在golang里面很是明显，在函数调用时首字母小写的函数在其他文件里面是调不到的。下面给出正确的结构体定义
type ResultCode struct {
Msg string `json:"msg"`
Code int `json:"code"`
Data string `json:"data"`
}
**粗体** _斜体_ [链接](http://example.com) `代码` - 列表 > 引用。你还可以使用@来通知其他用户。