<?php $arr = array(0 => array("key" => "val"), 1 => array("key" => "anotherval")); $key = "key"; $t = []; var_dump($t[]="foo"); /* $result = array_reduce($arr, function(&$cur, $item) use ($key) { return $cur=array_key_exists($key, $item)?array_merge($cur, [$item[$key]]):$cur; }, []); var_dump($result);*/
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