Validação do CPF em PHP

Função para validação do número do CPF em PHP.

Como todos sabem o cpf é validado através de um cálculo númerico e, como é mais facil fazer q explicar, segue abaixo a função para validação.

Obs.: Vale à pena frizar, para validação de um cpf não é necessário acessar uma base de dados da receita federal e sim efetuar um cálculo matemático para validar a seguencia numérica com o digito verificador. Vale lembrar ainda que a validação do mesmo não garante a total veracidade do número, pois podemos gerar números (se soubermos a regra de validação) que são válidos mas não são existentes.

<?php 

// Função que valida o CPF
function validar_cpf($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' || $cpf == '55555555555' || $cpf == '66666666666' || $cpf == '77777777777' || $cpf == '88888888888' || $cpf == '99999999999'){
   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;
   }
}

?>
Postado Por Thomas Jefferson em 12/08/2011 08:47:12
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