What potential issue can arise from placing the code at the top of the index.php file?

Placing code at the top of the index.php file can cause headers to be sent prematurely, which can lead to errors such as "Headers already sent" or unexpected output being displayed on the page. To solve this issue, the code should be placed before any HTML or whitespace is output to the browser. 

<?php
ob_start(); // Start output buffering
// Your PHP code here
ob_end_flush(); // Flush the output buffer
?>
<!DOCTYPE html>
<html>
<head>
    <title>Your Page Title</title>
</head>
<body>
    <!-- Your HTML content here -->
</body>
</html>

Keywords

syntax error header already sent output buffering session_start include path

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