How can one avoid outputting content before using the header function in PHP for redirection?

When using the header function in PHP for redirection, it is important to avoid outputting any content before the header function is called. This is because headers must be sent before any actual content is output to the browser. To avoid this issue, you can use output buffering to capture any output before sending headers. 

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

// Your code here

if ($condition) {
    header("Location: newpage.php");
    exit;
}

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

Keywords

output buffering ob_start header function redirection headers_sent

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