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                            - 隨機生成字符串

````

/**
     * 隨機生成字符串
     * @param int $length
     * @return null|string
     */
    private static function getRandChar($length = 6)
    {
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol)-1;

        for($i=0;$i<$length;$i++){
            $str.=$strPol[rand(0,$max)]; //rand($min,$max)生成介于min和max兩個數之間的一個隨機整數
        }
        return $str;
    }
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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