PHP: Random string with numbers and letters

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I thought that some of you might find it useful to learn how to generate a random string or a random number with PHP. I wrote a quick function to use PHP to generate random. See it below :

function genRandomString() {
$length = 10;
$characters = ’0123456789abcdefghijklmnopqrstuvwxyz’;
$string = ”;

for ($p = 0; $p < $length; $p++) {
$string .= $characters[mt_rand(0, strlen($characters))];
}

return $string;
}
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