本文實例分析了php中array_unshift()修改數(shù)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(shù)組的開頭添加元素，但今天突然發(fā)現(xiàn)如果數(shù)組的鍵值是數(shù)字類型的（或能轉(zhuǎn)成數(shù)字類型的），array_unshift()會修改所有鍵為數(shù)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(jié)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(shù)組鍵值發(fā)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?qū)Υ诵枰裢庾⒁饬耍?/P>

希望本文所述對大家PHP程序設(shè)計有所幫助。