PHP include files
PHP include and require statements
In PHP, you can insert a The contents of the file.
include and require statements are used to insert useful code written in other files into the execution flow.
and Require Except for different ways to deal with errors, they are the same in other aspects:
· Require generate a fatal error (e_compile_error). .
· include generates a warning (E_WARNING), and the script will continue to execute after the error occurs.
So if you want to continue execution and output the results to the user even if the included file is missing, then use include. Otherwise, in frameworks, CMS, or complex PHP application programming, always use require to reference key files to the execution flow. This helps improve application security and integrity in the event that a critical file is accidentally lost.
Including files saves a lot of work. This means you can create standard header, footer or menu files for all web pages. Then, when the header needs updating, you simply update the header include file.
Syntax
include 'filename';
or
require 'filename';
PHP include and require statements
Basic Example
Suppose you have a standard page header file named "header.php". To reference this header file in the page, please use include/require:
<html>
<head>
<meta charset="utf-8">
<title>php中文网</title>
</head>
<body>
<?php include 'header.php'; ?>
<h1>欢迎来到我的主页!</h1>
<p>一些文本。</p>
</body>
</html>
Example 2
Suppose we have a standard menu file used in all pages.
"menu.php":
echo '<a href="/">主页</a>
<a href="/html">HTML 教程</a>
<a href="/php">PHP 教程</a>';
All pages in the website should reference this menu file. The following is the specific approach:
<html>
<head>
<meta charset="utf-8">
<title>php中文网</title>
</head>
<body>
<div>
<?php include 'menu.php'; ?>
</div>
<h1>欢迎来到我的主页!</h1>
<p>一些文本。</p>
</body>
</html>
Example 3
Suppose we have an include file ("vars.php") that defines variables:
<?php
$color='red';
$car='BMW';
?>
These variables can be used in calls In the file:
<html>
<head>
<meta charset="utf-8">
<title>php中文网</title>
</head>
<body>
<h1>欢迎来到我的主页!</h1>
<?php
include 'vars.php';
echo "I have a $color $car"; // I have a red BMW
?>
</body>
</html>
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