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How To Resolve “Header Already Sent Error In PHP” While Redirecting

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The header already sent error in PHP is a very common error. The main reason behind header already sent is, before the redirect code starts you already have some output.

What is header, as per php.net

header() is used to send a raw HTTP header. See the » HTTP/1.1 specification for more information on HTTPheaders.

In simple terms, header is a function where you can pass some methods  for the action you need done.Defining a page 404 in PHP using header for

Making status code  404 in PHP using Header

<?php
	header("HTTP/1.0 404 Not Found");
?>

or redirect using header in PHP

<?php
	header("Location: http://hiteshchandwani.com/");
	exit;
?>

Here is a solution on how you can prevent header already sent error in PHP

• Make sure no output is sent (print) before the PHP redirect using the header function, be it HTML code or white space or just a new line.
• If you aren’t sure of output then do the following, right click -> click the view source. If there is any output then you will be able to recognize it.
• Use below method to redirect, which checks if header is already sent,  if yes then use alternate methods to redirect

  if (!headers_sent())
  	header("Location: http://hiteshchandwani.com/");
  else {
  	echo '<script type="text/javascript">';
  	echo 'window.location.href="https://hiteshchandwani.com/";';
  	echo '</script>';
  	echo '<noscript>';
  	echo '<meta http-equiv="refresh" content="0;url=https://hiteshchandwani.com/" />';
  	echo '</noscript>';
  }

If you have any issue regards header error in PHP then don’t hesitate to comment, I will help you out.

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