<?php

function cpf_errado($cpf) {
		$erro = false;
    		$aux_cpf = "";
    		for($j=0;$j<strlen($cpf);$j++)
      			if(substr($cpf,$j,1)>="0" AND substr($cpf,$j,1)<="9")
         				$aux_cpf .= substr($cpf,$j,1);
    		if(strlen($aux_cpf)!=11)
      			$erro = true;
    		else {
    			$cpf1 = $aux_cpf;
      			$cpf2 = substr($cpf,-2);
      			$controle = "";
      			$start = 2;
      			$end = 10;
      			for($i=1;$i<=2;$i++) {
      				$soma = 0;
        				for($j=$start;$j<=$end;$j++)
          				  $soma += substr($cpf1,($j-$i-1),1)*($end+1+$i-$j);
        				if($i==2)
          				  $soma += $digito * 2;
        				$digito = ($soma * 10) % 11;
        				if($digito==10)
          				  $digito = 0;
        				$controle .= $digito;
        				$start = 3;
        				$end = 11;
      			}
      			if($controle!=$cpf2)
        				$erro = true;
    		}
    
    		return $erro;
  	}
?>