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<?php $document = array('url'=> array("a", "b,")); array_unshift($document['url'], "/"); var_dump($document);
Output for 4.3.0 - 7.2.0
array(1) { ["url"]=> array(3) { [0]=> string(1) "/" [1]=> string(1) "a" [2]=> string(2) "b," } }