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<?php
 // Create a random string, leaving out 'o' to avoid confusion with '0'
 $char = strtoupper(substr(str_shuffle('abcdefghjkmnpqrstuvwxyz'), 0, 4));
 
 // Concatenate the random string onto the random numbers
 // The font 'Anorexia' doesn't have a character for '8', so the numbers will only go up to 7
 // '0' is left out to avoid confusion with 'O'
 $str = rand(1, 7) . rand(1, 7) . $char;
 
 ?>
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