在php中验证url

Question

I have the following seems simple code in php; but the ptoblem is that it shows all valid links as "not valid"; any help appreciated:

<?php
   $m = "urllist.txt";
   $n = fopen($m, "r");
   while (!feof($n)) {
      $l = fgets($n);
      if (filter_var($l, FILTER_VALIDATE_URL) === FALSE) {
          echo "NOT VALID - $l<br>";
      } else {
          echo "VALID - $l<br>";
      }
   }
   fclose($n);
?>

Answer 1

The string returned by fgets() contains a trailing newline character that needs to be trimmed before you can validate it. Try out following code, I hope this will help you:

<?php
  $m = "urllist.txt";
  $n = fopen($m, "r");
  while (!feof($n)) {
    $l = fgets($n);
    if(filter_var(trim($l), FILTER_VALIDATE_URL)) {
      echo "VALID - $l<br>";
    } else {
      echo "NOT VALID - $l<br>";
    }      
  }
  fclose($n);
?>

I have tried with following urls:

http://stackoverflow.com/
https://www.google.co.in/
https://www.google.co.in/?gfe_rd=cr&ei=bf4HVLOmF8XFoAOg_4HoCg&gws_rd=ssl
www.google.com
http://www.example.com
example.php?name=Peter&age=37

and get following result:

VALID - http://stackoverflow.com/ 
VALID - https://www.google.co.in/ 
VALID - https://www.google.co.in/?gfe_rd=cr&ei=bf4HVLOmF8XFoAOg_4HoCg&gws_rd=ssl 
NOT VALID - www.google.com 
VALID - http://www.example.com 
NOT VALID - example.php?name=Peter&age=37