PHP's most powerful random string generation function

In PHP, especially website programs, it is often necessary to generate random passwords or strings, such as WeChat tokens, API keys, AppSecret, etc. Use the following random string generation function to easily generate what you need random string.

The code is as follows:

/**
 * 随机字符
 * @param number $length 长度
 * @param string $type 类型
 * @param number $convert 转换大小写
 * @return string
 */
function random($length=6, $type='string', $convert=0){
    $config = array(
        'number'=>'1234567890',
        'letter'=>'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
        'string'=>'abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789',
        'all'=>'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'
    );
     
    if(!isset($config[$type])) $type = 'string';
    $string = $config[$type];
     
    $code = '';
    $strlen = strlen($string) -1;
    for($i = 0; $i < $length; $i++){
        $code .= $string{mt_rand(0, $strlen)};
    }
    if(!empty($convert)){
        $code = ($convert > 0)? strtoupper($code) : strtolower($code);
    }
    return $code;
}

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