Random number generation from array in PHP

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<?php
// array_rand();从数组中随机取出一个或多个单元
// 如果array_rand不写length参数或者参数是1，返回的不是数组，而是int类型的整数，如下的var_dump，这样的话赋值给变量再array_merge就会报错。
// var_dump(array_rand(range(0,9),$length));
// array_flip();交换数组中的键和值
// range();根据范围创建数组，包含指定的元素
// shuffle — 打乱数组,返回的是布尔值，不适合本案例
$merge=array_rand(array_flip(array_merge(range(&#39;a&#39;,&#39;z&#39;),range(0,9))),4);
print_r($merge);
 ?>

<?php
// join(&#39;&#39;,$array)以空连接数组，并返回字符串，join是implode的别名
$str=join(&#39;&#39;,array_rand(array_flip(array_merge(range(&#39;a&#39;,&#39;z&#39;),range(0,9))),4));
var_dump($str);
 ?>

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