Online PHP editor | output for ZsZkj

<?php function find_value_by_key($key,$array) { $data = array('key'=>$key,'ret'=>false); array_walk_recursive($array,function($v,$k) use (&$data) { if ($data['ret']) return; if ($k==$data['key'] and $v) $data['ret'] = $v; },$data); return $data['ret']; } $array = [ 'foo' => '0', 'bar' => [ 'boo' => 'two', 'foo' => null, 'loo' => [ 'foo' => 0, ], ], 'goo' => [ 'foo' => '', ] ]; var_export( find_value_by_key('foo', $array) );