php对二维数组排序

Question

排序前

$arr = array(
  'apple' => array('weight'=>'3'),
  'orange' => array('weight'=>'5'),
  'banana' => array('weight'=>'2'),
  'tomato' => array('weight'=>'1'),
);

排序后(根据weight排序)

?

请教大家php怎么写

Answer 1

• PHP: usort - Manual

$arr = [
    ['name' => 'apple', 'weight' => '3'],
    ['name' => 'orange', 'weight' => '5'],
    ['name' => 'banana', 'weight' => '2'],
    ['name' => 'tomato', 'weight' => '1'],
];

usort($arr, function ($current, $next): int {
    return $current['weight'] > $next['weight'] ? 1 : -1;
});

var_dump($arr);

Answer 2

/**

• @desc arraySort php二维数组排序 按照指定的key 对数组进行自然排序
• @param array $arr 将要排序的数组
• @param string $keys 指定排序的key
• @param string $type 排序类型 asc | desc
• @return array

*/
function arraySort($arr, $keys, $type = 'asc')
{

$keysvalue = $new_array = array();
foreach ($arr as $k => $v) {
    $keysvalue[$k] = $v[$keys];
}
if ($type == 'asc') {
    natsort($keysvalue);
}
if ($type == 'desc') {
    natsort($keysvalue);
    // 将原数组中的元素顺序翻转,如果第二个参数指定为 true，则元素的键名保持不变
    $keysvalue = array_reverse($keysvalue, TRUE);
}
foreach ($keysvalue as $k => $v) {
    $new_array[$k] = $arr[$k];
}
return $new_array;

}
$arr = arraySort($arr, "weight", "asc" );
var_dump($arr);

Answer 3

$arr = array(
  'apple' => array('weight'=>'3'),
  'orange' => array('weight'=>'5'),
  'banana' => array('weight'=>'2'),
  'tomato' => array('weight'=>'1'),
);
$weight = array_column($arr, 'weight');
array_multisort($weight, SORT_ASC, $arr);
var_dump($arr);