How can the use of JavaScript alert messages interfere with PHP header redirection in web development?

When using JavaScript alert messages before a PHP header redirection, the alert can disrupt the redirection process as the headers are already sent to the browser. To solve this issue, ensure that no output is sent to the browser before using header redirection in PHP. 

<?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_clean(); // Clean the output buffer

// Perform header redirection
header("Location: newpage.php");
exit();
?>

Keywords

JavaScript alert messages PHP header redirection web development

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