php 数组元素随机排序代码
因为工作需要我要对我定义好的数组进行随机排序,每一次循环都要是不同的,下面我们利用了php shuffle函数随机对数组元素进行排序,方法非常简单.
shuffle() 函数把数组中的元素按随机顺序重新排列,若成功,则返回 true,否则返回 false.
注释:本函数为数组中的单元赋予新的键名,这将删除原有的键名而不仅是重新排序,代码如下:
- */
- $array = array(1,2,3,4);
- for( $i=1;$i<30;$i++)
- {
- shuffle( $array );
- print_r($array);
- echo '<br />';//开源代码phpfensi.com
- }
- /*
- 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 )
总结:php有大量的函数,如果你知道这个函数会对你开发提高大量的帮助,如果你不知道要自己写可能花很多时间.