Question

In: Computer Science

Why am I getting this error using 000webhost , but I do not get this error...

Why am I getting this error using 000webhost , but I do not get this error running XAMPP?

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd2/006/14881006/public_html/test/index.php:1) in /storage/ssd2/006/14881006/public_html/test/index.php on line 8
Code is below.

********************************************************************************************************************

<!DOCTYPE html>
<?php

   //Determine if the submit button has been clicked to set the cookie name and value
   if (isset($_POST['name'])){
           $cookie_name = $_POST['name'];
           $cookie_value = $_POST['value'];
           setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day
   } else {
       $cookie_name = NULL;
       $cookie_value = NULL;
   }
?>

<html>
   <body>
       
       <form action="index.php" method="post">
           <p>Cookie name: <input type="text" name="name" /></p>
           <p>Cookie value: <input type="text" name="value" /></p>
           <br>
           <p><input type="submit" name="Submit"/></p>
       </form>

<?php

           //Display cookie name and value
           if(!isset($_COOKIE[$cookie_name])) {
           echo "Cookie named '" .$cookie_name. "' is not set!";
           } else {
           echo "Cookie '" .$cookie_name. "' is set!<br>";
           echo "Value is: " .$_COOKIE[$cookie_name];
           }
       ?>

<p><strong>Note:</strong> You might have to reload the page to see the value of the cookie.</p>
</body>
</html>

Expert Solution

Some functions modifying the HTTP header are:

header / header_remove
session_start / session_regenerate_id
setcookie / setrawcookie

Output can be:

Unintentional:
- Whitespace before <?php or after ?>
- The UTF-8 Byte Order Mark specifically
- Previous error messages or notices

Intentional:
- print, echo and other functions producing output
- Raw <html> sections prior <?php code.

The header() warning contains all relevant information to locate the problem cause:

Cannot modify header information - headers already sent by (output started at /storage/ssd2/006/14881006/public_html/test/index.php:1) in /storage/ssd2/006/14881006/public_html/test/index.php on line 8

Here "line 8" refers to the script where the header() invocation failed.

The "output started at" note within the parenthesis is more significant. It denominates the source of previous output.

In this,

Raw HTML areas

Unparsed HTML sections in a .php file are direct output as well. Script conditions that will trigger a header() call must be noted before any raw <html> blocks.

<!DOCTYPE html>
<?php
    // Too late for headers already.

Use a templating scheme to separate processing from output logic.

Place form processing code atop scripts.
Use temporary string variables to defer messages.
The actual output logic and intermixed HTML output should follow last.

Another reason could be:

Whitespace before <?php for "script.php line 1" warnings

If the warning refers to output in line 1, then it's mostly leading whitespace, text or HTML before the opening <?php token.

 <?php
# There's a SINGLE space/newline before <? - Which already seals it.

Similarly it can occur for appended scripts or script sections:

?>

<?php

PHP actually eats up a single linebreak after close tags. But it won't compensate multiple newlines or tabs or spaces shifted into such gaps.

Hope this helps you. For further queries please add comment below. Please give an upvote. Thank you.

venereology answered 1 month ago

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