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PHP header() Function Example | header() Method In PHP Tutorial

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PHP header() Function Example | header() Method In PHP Tutorial is today’s topic. Redirection in PHP can be done using the header() function.  Remember that the header() must be called before any actual output is sent, either by standard HTML tags, blank lines in the file, or from PHP.  In PHP 4 version and later, you can use output buffering to solve this problem.

PHP header() Function

The HTTP functions are those functions which modify information sent to a client or browser by a Web server before any other output has been sent.

The PHP header() function sends the HTTP header to the client or browser in raw form. Before HTML, XML, JSON or other output has been sent to the browser or client, and the raw data is sent with the request (especially HTTP Request) made by the server as header information.

HTTP header provides the required data about an object sent in the message body more precisely about the request and response.

#Syntax of header() Function

header( $header, $replace = TRUE, $http_response_code )
  1. $header: The $header parameter holds the header string. There are two types of header calls. The first header starts with the string “HTTP/,” which is used to figure out the HTTP status code to send. The second case of the header is the “Location:”. It is a mandatory parameter.
  2. $replace: The $replace is an optional parameter. It denotes the header should replace previous or add the second header. The default value is True (will replace). If $replace value is False, then it forces multiple headers of the same type.
  3. $http_response_code: The $http_response_code is an optional parameter. It forces an HTTP response code to the specified value (PHP 4.3 and higher).

See the following example.

<?php
  
// Redirect the browser 
header("Location: https://appdividend.com");

#Prevent page caching in PHP

We can prevent the page caching by using the header() function.

<?php

// PHP program to describes header function 

header("Expires: Sun, 19 February 1994 06:02:34 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");

#Save PDF File

If we want a functionality in which let the user be prompted to save a generated PDF file. Then the Content-Disposition header is used to supply the recommended filename and force the browser to display the save dialog box.

See the following code.

<?php
  
header("Content-type:application/pdf");

// It will be called downloaded.pdf
header("Content-Disposition:attachment;filename='app.pdf'");
  
// The PDF source is in original.pdf
readfile("data.pdf");

#Other Applications

  1. If we want to change the page location.
  2. If we want to set timezone.
  3. If we want the caching control.
  4. If we want to initiate force download.
  5. If we want to send HTTP Status.

Finally, PHP header() Function Example | header() Method In PHP Tutorial is over.

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