仓库初始化

extend/Yzh/Utils/MessString.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Yzh\Utils;
+
+class MessString
+{
+    const MIN_RAND_LENGTH = 8;
+    const DEFAULT_RAND_LENGTH = 16;
+    const MAX_RAND_LENGTH = 64;
+    const ALL_STRING_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-+_';
+
+    /**
+     * @param $length
+     * @return false|string
+     */
+    public static function rand($length = 16)
+    {
+        return substr(str_shuffle(self::ALL_STRING_CHARS), 0, $length > self::MAX_RAND_LENGTH ? self::DEFAULT_RAND_LENGTH : ($length < self::MIN_RAND_LENGTH ? self::DEFAULT_RAND_LENGTH : $length));
+    }
+}