PHP Include

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PHP Tutorial > PHP Commands > INCLUDE

INCLUDE is used in PHP to append the code from an external file into the current file. The syntax for INCLUDE is

INCLUDE ("external_file_name");

This is a convenient feature for a large website. Often, we may want to change an element of the website that is consistent across the entire site, yet we don't want to go through the trouble of updating every single file. In this case, we can simply use INCLUDE in every file to call the same external file, and then all we need to change is the content in that one external file.

Let's look at a simple example. Assuming we have the following two files:

index.php

<?php
  print "This is the original content<br>";
  include ("external_file");
?>

external_file

<?php
  print "This is the external content";
?>

Upon executing index.php, we'll get the following output:

This is the original content
This is the external content

This is because, to the web server, it sees the following content:

<?php
  print "This is the original content<br>";
  print "This is the external content";
?>

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