多维数组转化为单层数组PHP

Question

我有以下数组返回

Array
    (
        [0] => Array
            (
                [uid] => 616941445
            )
        [1] => Array
            (
                [uid] => 1354124203
            )
    )

然而，我只想要一个单层数组，所以我想要这样的东西。

Array
(     
[0] => 616941445
[1] => 1354124203
)

Answer 1

foreach ($arr as $key => $val) {
  $arr[$key] = $val['uid'];
}

Answer 2

<?php
$multi_arr = array(
    array(
        'uid' => 616941445
    ),
    array(
        'uid' => 1354124203
    ),
);
$single_arr = array();
foreach($multi_arr as $arr){
    foreach($arr as $val) $single_arr[] = $val;
}
?>

Answer 3

与往常一样，当您需要将两个级别的数组更改为一个级别而不需要保留键时:

$your2DArray = array(/* .. */);
$flatArray = array_map('array_pop', $your2DArray);

就像你想的那样，没有循环。

Answer 4

foreach($arr as $key=>$val) {
    $single_arr[] = $arr[$key]['uid'];
}