cpf validation

cpf_validation.php

  function validaCPF($cpf) {

    $cpf = str_pad(ereg_replace('[^0-9]', '', $cpf), 11, '0', STR_PAD_LEFT);

    if (strlen($cpf) != 11  || $cpf == '00000000000' || $cpf == '11111111111' || $cpf == '22222222222' || $cpf == '33333333333' || $cpf == '44444444444' || $cp
      return false;
    } else {   
      for ($t = 9; $t < 11; $t++) { 
        for ($d = 0, $c = 0; $c < $t; $c++) { 
          $d += $cpf{$c} * (($t + 1) - $c);
        }

        $d = ((10 * $d) % 11) % 10;
    
        if ($cpf{$c} != $d) { 
          return false;
        } 
      }

      return true;
    }

  }