array_push の返り値は処理後の配列そのものではなく、配列の要素数なので、書き方には気を付けなければいけません。
example.php
$ex_array = array();
array_push($ex_array, 'youso');
//$ex_array = array_push($ex_array, 'youso1'); ではエラーになる
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