<?php
/* 
Versoes de Referencias 2.0;3.0;301;3.2
Modificado por Felipe Jorge L. Rabelo Ferreira 23/04/2005
*/
$cpf="123456-09";

$cpf = ereg_replace("[^0-9]", "", $cpf);
if (strlen($cpf)!=11)
	echo "CPF INVALIDO";
else
{
		$dv = substr($cpf,-2);
		$compdv = 0;
		$nulos = array("12345678909","11111111111","22222222222","33333333333", 
               "44444444444","55555555555","66666666666","77777777777", 
               "88888888888","99999999999","00000000000");   

		if(in_array($cpf, $nulos))
				echo "CPF NULO"; 
 
		else 
		{ 
				 $acum=0; 
				 for ($i=0; $i<9; $i++)
					   $acum+=$cpf[$i]*(10-$i);
				 $x=$acum % 11;
				 $acum = ($x>1) ? (11 - $x) : 0;
				 $compdv = $acum * 10;
				 
				 $acum=0;
				 for ($i=0; $i<10; $i++)
					   $acum+=$cpf[$i]*(11-$i); 
				 $x=$acum % 11;
				 $acum = ($x>1) ? (11 - $x) : 0;
				 $compdv = $compdv + $acum;
				 
				 if($compdv == $dv)
					echo "CPF VALIDO";
				else
					echo "CPF INVALIDO";
		 } 
}

?>