PHP code showing blank page - php

Question

I want to send a email with input data from my html page. I am using next php script:
<?php
if((isset($_POST['budget']))&&(isset($_POST['type']))) {
$email_to = "design.er#icloud.com";
$email_subject = "Design";
function died($error) {
// your error code can go here
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
echo "These errors appear below.<br /><br />";
echo $error."<br /><br />";
echo "Please go back and fix these errors.<br /><br />";
die();
}
// validation expected data exists
if(!isset($_POST['budget']) ||
!isset($_POST['type'])) {
died('We are sorry, but there appears to be a problem with the form you submitted.');
}
$email = $_POST['email']; // required
$budget = $_POST['budget']; // required
$type = $_POST['type']; // required
$comments = $_POST['comments']; // not required
$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+#[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
$string_exp = "/^[A-Za-z .'-]+$/";
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)."\n";
$email_message .= "Budget: ".clean_string($budget)."\n";
$email_message .= "Type: ".clean_string($type)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";
// create email headers
$headers = 'From: '.$email."\r\n".
'Reply-To: '.$email."\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($email_to, $email_subject, $email_message, $headers);
?>
<!-- THERE MY PHP CODE, I REMOVED IT ESPECIALLY FOR STACKOVERFLOW, BUT IT EXIST -->
<?php
}
?>
But it doesn't work. When I am clicking on submit - it shows me a blank page.
I can't understand what the problem is.
Also, I tried next script and it worked perfectly:
<?php
$to = "xyz#somedomain.com";
$subject = "This is subject";
$message = "<b>This is HTML message.</b>";
$message .= "<h1>This is headline.</h1>";
$header = "From:abc#somedomain.com \r\n";
$header .= "Cc:afgh#somedomain.com \r\n";
$header .= "MIME-Version: 1.0\r\n";
$header .= "Content-type: text/html\r\n";
$retval = mail ($to,$subject,$message,$header);
if( $retval == true ) {
echo "Message sent successfully...";
}else {
echo "Message could not be sent...";
}
?>

Answer 1

There is nothing showing because there is nothing to show. The only place in the script where there is an effort to display something is if the page is accessed without the proper post variables (in this case displaying the contents of the died() method). At the very bottom of this script there is an html comment with <!-- HTML CODE HERE --> and there's nothing there.

Answer 2

An absolutely blank page (i.e. even no output when you view the page's source in the browser) usually means that a PHP error occurred and error reporting is turned off. In this case you should take a look into the server's log files, if you can do that. (It might not be available on some hosted platforms.)
Common mistakes for such a "white screen of death" are syntax errors in the PHP script, but yours seems to be OK. However, some host providers disable some functions like the mail() function to avoid scripts that send spam emails. In this case, the mail() function could cause an internal error which stops the script execution at that point. Since this is before the point where any HTML code is printed in your script, this could be the cause of the error.