How to randomly generate a combination of numbers and letters in php, generate numbers and letters in php_PHP tutorial

How to randomly generate a combination of numbers and letters in php, how to generate a combination of numbers and letters in php

The example in this article describes how to randomly generate a combination of numbers and letters in php. Share it with everyone for your reference. The details are as follows:

Go directly to the code:
Copy code The code is as follows: function getRandomString($len, $chars=null)
{
If (is_null($chars)){
            $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
}  
mt_srand(10000000*(double)microtime());
for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i ){
          $str .= $chars[mt_rand(0, $lc)];
}
Return $str;
}

For example, randomly generate a 2-digit letter and number combination
Just call the function and pass parameter 2.

echo getRandomString(2);

If you only generate lowercase letters, you can use a similar method

echo chr(mt_rand(65, 90);

Capital letters

echo chr(mt_rand(97, 122));

I hope this article will be helpful to everyone’s PHP programming design.

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