How can PHP developers ensure that header commands are executed before any output in a request?

To ensure that header commands are executed before any output in a request, PHP developers can use the ob_start() function to buffer the output. This allows headers to be set before any content is sent to the browser. By buffering the output, developers can prevent any accidental output that may interfere with header commands. 

<?php
ob_start();
// Set headers here
header('Content-Type: text/html');
// Send output
echo "Hello, World!";
ob_end_flush();

Keywords

output buffering ob_start ob_end_flush headers_sent flush

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