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@ 2013-01-10T21:35:58Z

<?php

function getLastDay($mes = null, $ano = null) {

    $mes = is_null($mes) ? date('m') : $mes;
    $ano = is_null($ano) ? date('Y') : $ano;


    $data = $ano . '-' . $mes . '-' . '01';

	return date('t', strtotime($data));
}

echo getLastDay();

Output
Performance
VLD
References
Branches

date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

34.95 ms | 402 KiB | 5 Q