foreach 两层改变原值，请大神赐教

Question

如下要怎么做

$data = [1,2,3,[a,b,c]];
foreach($data as &$e){
    //$data数组里的数量不确定，一维数组各加1，二维数组各拼接m
    
}
var_dump($data);//[2,3,4,[am,bm,cm]]
unset($e);

Answer 1

$data = [1,2,3,['a','b','c']];
foreach($data as &$e){
    //$data数组里的数量不确定，一维数组各加1，二维数组各拼接m
    if(is_array($e)){
        foreach ($e as $k => &$v) {
            $v = $v.'m';
        }
    }else{
        $e = $e + 1;
    }
    
}
print_r($data);//[2,3,4,[am,bm,cm]]

Answer 2

<?php
function test(&$array){
    foreach ($array as $key => &$value) {
        if(is_array($value)){
            foreach($value as &$v){
                $v.= 'm';
            }
        } else {
            ++$value;
        } 
    }
}
$array = array(1, 2, 3, array('a', 'b', 'c'));
test($array);
print_r($array);

运行结果如下：
Array
(

[0] => 2
[1] => 3
[2] => 4
[3] => Array
    (
        [0] => am
        [1] => bm
        [2] => cm
    )

)

Answer 3

<?php
$data = [1,2,3,['a','b','c']];
foreach($data as &$v){
    if(is_array($v)){
        foreach ($v as &$av) {
            $av .= 'm';
        }
    }else if(is_numbric($v)){
        ++$v;
    }
    
}
print_r($data);//[2,3,4,[am,bm,cm]]