Generate Random keys based from a pattern of string
<?php
$keygen = new Keygen\Utility\Generator\KeyGenerator('0123456789abcdefghijklmnopqrstuvwxyz');
$csvOutput = new Keygen\Utility\Output\CsvOutput(__DIR__);
// Generate 10000 9 digit unique keys based from the default pattern
// string '0123456789abcdefghijklmnopqrstuvwxyz'
// the result keys will also be written to a csv file using
// the CsvOutput handler
$keys = $keygen->generateUniqueKeys(9, 10000, $csvOutput);
print_r $keys;