- rand: documentation ( source)
<?php
$characters=('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz');
$delka=8;
$randomString = '';
for ($i = 0; $i < $delka; $i++) {
$randomString .= $characters[rand(0, strlen($characters) - 1)];
}
echo $randomString;
?>