How can the error "Cannot modify header information - headers already sent by..." be resolved in PHP?

The error "Cannot modify header information - headers already sent by..." occurs when there is any output sent to the browser before PHP tries to modify header information. To resolve this issue, you need to ensure that no output is sent before header functions are called. One common solution is to move all header-related functions to the top of the PHP file before any HTML or whitespace. 

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

// Your PHP code here

// Example of setting a header
header('Location: new_page.php');

ob_end_flush(); // Flush the output from the buffer
?>

Keywords

output buffering ob_start ob_end_flush header error_reporting

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