php教程 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。
*/
$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 )
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。
*/