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VALIDAR EMAIL Y STRING CON PHP

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Validacion de email y string con php

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  1. function comprobar_string($string){
  2.         //compruebo que los caracteres sean los permitidos
  3.         $permitidos = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_áéíóúÁÉÍÓÚ";
  4.         for ($i=0; $i<strlen($string); $i++){
  5.             if (strpos($permitidos, substr($string,$i,1))===false){
  6.                 $error = "novalido".$string;
  7.                 return $error;
  8.             }
  9.         }
  10.         return $string;
  11.     } 
  12.  
  13.     function comprobar_email($email){
  14.         $mail_correcto = 0;
  15.         //compruebo unas cosas primeras
  16.         if ((strlen($email) >= 6) && (substr_count($email,"@") == 1) && (substr($email,0,1) != "@") && (substr($email,strlen($email)-1,1) != "@")){
  17.             if ((!strstr($email,"'")) && (!strstr($email,"\"")) && (!strstr($email,"\\")) && (!strstr($email,"\$")) && (!strstr($email," "))) {
  18.                 //miro si tiene caracter .
  19.                 if (substr_count($email,".")>= 1){
  20.                     //obtengo la terminacion del dominio
  21.                     $term_dom = substr(strrchr ($email, '.'),1);
  22.                     //compruebo que la terminación del dominio sea correcta
  23.                     if (strlen($term_dom)>1 && strlen($term_dom)<5 && (!strstr($term_dom,"@")) ){
  24.                         //compruebo que lo de antes del dominio sea correcto
  25.                         $antes_dom = substr($email,0,strlen($email) - strlen($term_dom) - 1);
  26.                         $caracter_ult = substr($antes_dom,strlen($antes_dom)-1,1);
  27.                         if ($caracter_ult != "@" && $caracter_ult != "."){
  28.                             $mail_correcto = 1;
  29.                         }
  30.                     }
  31.                 }
  32.             }
  33.         }
  34.         if ($mail_correcto)
  35.             return $email;
  36.         else
  37.             return "novalido".$email;
  38.     }

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