本文實例分析了php中array_unshift()修改數組key注意事項。分享給大家供大家參考，具體如下：
眾所周知,array_unshift()用來在數組的開頭添加元素，但今天突然發現如果數組的鍵值是數字類型的（或能轉成數字類型的），array_unshift()會修改所有鍵為數字的元素的Key,真是坑啊
實例:
$a=array(111=>"dddddddddddd","112"=>array("one"=>"orange","two"=>"hhhhh"), "113"=>array("one"=>"orange","two"=>"hhhhh"),"oooo"=>"jjjjj");print_r($a);echo "</br>";array_unshift($a, "aaaaaaaaa");print_r($a);echo "</br>"; 輸出結果:
Array ( [111] => dddddddddddd [112] => Array ( [one] => orange [two] => hhhhh ) [113] => Array ( [one] => orange [two] => hhhhh ) [oooo] => jjjjj )Array ( [0] => aaaaaaaaa [1] => dddddddddddd [2] => Array ( [one] => orange [two] => hhhhh ) [3] => Array ( [one] => orange [two] => hhhhh ) [oooo] => jjjjj )
看到了吧，array_unshift()后數組鍵值發生了變化，原來的111變成了1，真是坑哪！以后大家在使用array_unshift()的時候對此需要格外注意了！
