Can PHP developers still send headers after using flush() for output buffering?

When using output buffering in PHP with functions like ob_start() and flush(), headers must be sent before any content is output. Once output buffering is started, headers cannot be sent using functions like header(). To send headers after using flush(), you can store the headers in a variable and output them after flushing the buffer. 

<?php
ob_start();

// Output buffering started, headers cannot be sent here

// Store headers in a variable
$headers = "Content-Type: text/html";

// Flush the buffer
ob_flush();

// Send headers after flushing
header($headers);

// Output content
echo "Hello, World!";

ob_end_flush();
?>

Keywords

PHP developers headers flush() output buffering

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