How does foreach traverse an array and only retain values, no key values?

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I want to take out only the uid in each key value, but without the subscript.

Reply content:

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I want to take out only the uid in each key value, but without the subscript.

array_column($arr, 'uid');

Also

<code>$temp = array();
foreach ($a as $b) {
    $temp[] = $b['uid'];
}</code>