PHP Random String Generator, Random Value from Array

In this tutorial, we will creat a random string, get a value from an array. Why do we need it? Simple, sometime, we have license that limit number of query to 90, but we need more, so we register 5 or more licenses, then we use PHP random from array to get 1 license. Or we want to creat a 9 capital, number value for license key (for whom need generate a license key).

Demo: PHP Random String Generator, Random Value from Array

Now, let’s go.
First, we will generate a Random string:

function rand_str($length = 32, $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890')
    {
        $chars_length = (strlen($chars) - 1);  
        $string = $chars{rand(0, $chars_length)};
        for ($i = 1; $i < $length; $i = strlen($string))
        {
            $r = $chars{rand(0, $chars_length)
        };
        if ($r != $string{$i - 1}) $string .=  $r;  }
        return $string;
        }

That function will generate a random string with capital character and number. Number of character will define by us.
Example:

echo rand_str ($length = 15, $chars = 'ABCDEFGHKLMNPQRSTUVWXYZ123456789');

Will generate a random string in 15 chracter length, from these character only: ABCDEFGHKLMNPQRSTUVWXYZ123456789
If you need lowercase character, just define it in $chars. Something like this:

echo rand_str ($length = 15, $chars = 'ABCDEFGHKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvz123456789');

Now, how about get a license from an array license?
Let’s try:
We have a licenses list:

$licenselist = array('02AD-C7RC-ZLEH', '0298-ZACX-FF4F', '0378-34CX-FCVF', '6598-96CX-263F', '7246-823X-980F', '4358-9245-B678');

Now, we get 1 license key from that array:

function array_random($arr, $num = 1) {
    shuffle($arr);
    
    $r = array();
    for ($i = 0; $i < $num; $i++) {
        $r[] = $arr[$i];
    }
    return $num == 1 ? $r[0] : $r;
}

Used:

$license = array_random($licenselist);
    echo "<br /><br />".$license;

Well, that’s it. Is it simple?