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@ 2016-04-05T09:33:07Z

<?php

for ($y = 1999; $y<=2100; $y++) {
    for($m=1; $m<=12; $m++) {
      echo $y.'-'.sprintf('%02d ', $m), (int) preg_match('/20[0-9]{2}-(0[1-9]|1[0-2])/', $y.'-'.sprintf('%02d', $m)), PHP_EOL;
    }
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

55.56 ms | 402 KiB | 5 Q