php 數組元素隨機排序代碼

php教程 數組元素隨機排序代碼
因為工作需要我要對我定義好的數組進行隨機排序，每一次迴圈都要是不同的，下面我們利用了php shuffle函數隨機對數組元素進行排序。方法非常簡單。

shuffle() 函數把數組中的元素按隨機順序重新排列。

若成功，則返回 true，否則返回 false。

注釋：本函數為數組中的單元賦予新的鍵名。這將刪除原有的鍵名而不僅是重新排序。

*/
$array = array(1,2,3,4);
for( $i=1;$i<30;$i++)
{
 shuffle( $array );
 print_r($array);
 echo '<br />';
}
/*
array ( [0] => 3 [1] => 2 [2] => 4 [3] => 1 )
array ( [0] => 3 [1] => 4 [2] => 1 [3] => 2 )
array ( [0] => 2 [1] => 1 [2] => 3 [3] => 4 )
array ( [0] => 2 [1] => 4 [2] => 1 [3] => 3 )
array ( [0] => 3 [1] => 4 [2] => 2 [3] => 1 )
array ( [0] => 3 [1] => 2 [2] => 4 [3] => 1 )
array ( [0] => 3 [1] => 4 [2] => 1 [3] => 2 )
array ( [0] => 4 [1] => 2 [2] => 1 [3] => 3 )
array ( [0] => 2 [1] => 4 [2] => 1 [3] => 3 )
array ( [0] => 4 [1] => 3 [2] => 1 [3] => 2 )
array ( [0] => 3 [1] => 2 [2] => 1 [3] => 4 )
array ( [0] => 4 [1] => 3 [2] => 1 [3] => 2 )
array ( [0] => 4 [1] => 1 [2] => 2 [3] => 3 )
array ( [0] => 2 [1] => 1 [2] => 4 [3] => 3 )
array ( [0] => 3 [1] => 1 [2] => 4 [3] => 2 )
array ( [0] => 2 [1] => 1 [2] => 3 [3] => 4 )
array ( [0] => 4 [1] => 1 [2] => 3 [3] => 2 )
array ( [0] => 1 [1] => 4 [2] => 2 [3] => 3 )
array ( [0] => 3 [1] => 2 [2] => 1 [3] => 4 )
array ( [0] => 1 [1] => 2 [2] => 4 [3] => 3 )
array ( [0] => 1 [1] => 3 [2] => 4 [3] => 2 )
array ( [0] => 2 [1] => 4 [2] => 3 [3] => 1 )
array ( [0] => 3 [1] => 2 [2] => 1 [3] => 4 )
array ( [0] => 1 [1] => 3 [2] => 4 [3] => 2 )
array ( [0] => 2 [1] => 1 [2] => 4 [3] => 3 )
array ( [0] => 4 [1] => 1 [2] => 3 [3] => 2 )
array ( [0] => 3 [1] => 2 [2] => 1 [3] => 4 )
array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )
array ( [0] => 2 [1] => 1 [2] => 4 [3] => 3 )

總結：
php有大量的函數，如果你知道這個函數會對你開發提高大量的協助，如果你不知道要自己寫可能花很多時間。
*/