随机生成50000个数组元素 和 php 单利类代码

<?php 
$arr = range("10000","60000");
shuffle($arr);
if(file_put_contents('./file.php', '<?php' ."\r\n" . 'return $list = ' . var_export($arr,true) . ';')){
	echo 'ok';
}
?>

 下面是php单利类

<?php
header("Content-type:text/html;charset=utf-8");
class instance{
	private static $instance = null;

	private function __construct(){}
	public static function getInstance(){
		if(self::$instance == null){
			self::$instance = new instance;
		}
		return self::$instance;
	}
	private function __clone(){}
	public function eat(){
		echo '我在吃';
	}
}

 随机生成20个字符的字符串（我认为是最简单的一种）

<?php 
$str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//
$str = str_shuffle($str);
echo substr($str,0,20);
?>