PHP simply generates random strings

PHP simple custom method to generate random strings

/**
 * 生成随机字符串
 * @param string $lenth 长度
 * @return string 字符串
 */
function get_randomstr($lenth = 6) {
    return get_random($lenth, '123456789abcdefghijklmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ');
}
 
/**
 * 产生随机字符串
 *
 * @param    int        $length  输出长度
 * @param    string     $chars   可选的 ，默认为 0123456789
 * @return   string     字符串
 */
function get_random($length, $chars = '0123456789') {
    $hash = '';
    $max = strlen($chars) - 1;
    for($i = 0; $i < $length; $i++) {
        $hash .= $chars[mt_rand(0, $max)];
    }
    return $hash;
}

Usage:

echo get_randomstr(6);
echo get_randomstr(7);

Output:

vS8wZK
hQ17fEI

The above two results will be randomly generated, and the structure will be different every time it is run.

Analysis:

Pass in the number of generated strings through parameters to the method get_randomstr(); the get_randomstr() method then generates a random number through the get_random method and returns it to get_randomstr(). In fact, this process is through two I personally think it is more cumbersome to complete it with a custom method, although the idea is clear. In fact, the advantage of this method is that when we hard-code the get_random method in the public method, if we later find that some functions cannot be satisfied by get_random, we can extend it through the get_randomstr method.

So under normal circumstances, I recommend that you use the following method to generate random strings:

Several methods of generating PHP random numbers