validar cpf

cpfValidator.php

<?php
function validaCpf($cpf) {
    $cpf = preg_replace("/\D+/", "", $cpf);
    if(strlen($cpf) < 11 || count(array_count_values(str_split($cpf))) === 1) {
        return false;
    }
    for ($t = 9; $t < 11; $t++) {
        for ($dv = 0, $c = 0; $c < $t; $c++) {
            $dv += $cpf[$c] * (($t + 1) - $c);
        }
        $dv = ((10 * $dv) % 11) % 10;
	    if ($cpf[$c] != $dv) {
            return false;
        }
    }
    return true;
}