html - Contact form PHP shows blank -

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i took standard form use included comments are. website don't need comments left email , url in it. when remove related comments in php file shows blank page, not error.

here's code: 

<?php if(isset($_post['email'])) {      // change 2 lines below     $email_to = "email@email.com";      $email_subject = "new contact";       function died($error) {         // error code can go here         echo "we sorry, there error(s) found form submitted. ";         echo "these errors appear below.<br /><br />";         echo $error."<br /><br />";         echo "please go , fix these errors.<br /><br />";         die();     }      // validation expected data exists     if(!isset($_post['email']) ||         !isset($_post['url'])) || {         died('we sorry, there appears problem form submitted.');            }      $email_from = $_post['email']; // required     $url = $_post['url']; // not required       $error_message = "";     $email_exp = '/^[a-za-z0-9._%-]+@[a-za-z0-9.-]+\.[a-za-z]{2,4}$/';   if(!preg_match($email_exp,$email_from)) {     $error_message .= 'the email address entered not appear valid.<br />';   }     if(strlen($error_message) > 0) {     died($error_message);   }     $email_message = "form details below.\n\n";      function clean_string($string) {       $bad = array("content-type","bcc:","to:","cc:","href");       return str_replace($bad,"",$string);     }       $email_message .= "email: ".clean_string($email_from)."\n";     $email_message .= "url: ".clean_string($url)."\n";    // create email headers $headers = 'from: '.$email_from."\r\n". 'reply-to: '.$email_from."\r\n" . 'x-mailer: php/' . phpversion(); @mail($email_to, $email_subject, $email_message, $headers);   ?>  <!-- place own success html below -->  success  <?php } die(); ?>

you have || in if condition. remove , should work.

if(!isset($_post['email']) ||     !isset($_post['url'])) || {                           ^^^^     died('we sorry, there appears problem form submitted.');        }

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