[Solved] This code in functions.php causes a blank page error: add_action('wp_head', 'print_message'); function print_message() { echo 'Hi there!'; exit; } What is the problem? | Wordpress

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This code in functions.php causes a blank page error:

add_action('wp_head', 'print_message');
function print_message() {
  echo 'Hi there!';
  exit;
}

What is the problem?

AFunction name must be declared before add_action

BEcho cannot be used in wp_head hook

CCalling exit stops page loading, causing blank page

Dwp_head hook does not allow custom functions

Step-by-Step Solution

Solution:

Step 1: Analyze the function behavior
The function echoes a message then calls exit, which stops PHP execution immediately.
Step 2: Understand impact on page rendering
Calling exit in wp_head prevents the rest of the page from loading, resulting in a blank page.
Final Answer:
Calling exit stops page loading, causing blank page -> Option C
Quick Check:
exit halts PHP, causing blank page [OK]

Quick Trick: Avoid exit in hooks to prevent blank pages [OK]

Common Mistakes:

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This code in functions.php causes a blank page error: