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@ 2015-10-27T12:56:08Z

<?php

$cpf = 12345678912;
		if(is_numeric($cpf) && strlen($cpf) == 11) {
			$block1 = substr($cpf, 0, 3);
			$block2 = substr($cpf, 3, 3);
			$block3 = substr($cpf, 6, 3);
			$block4 = substr($cpf, 9);
			echo "$block1.$block2.$block3-$block4";
		}

Output
Performance
VLD
References
Branches

substr: documentation ( source)
is_numeric: documentation ( source)

preferences:dark modelive preview

64.62 ms | 402 KiB | 5 Q