php中的include和require的区别

The include (or require) statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement.

Including files is very useful when you want to include the same PHP, HTML, or text on multiple pages of a website.

It is possible to insert the content of one PHP file into another PHP file (before the server executes it), with the include or require statement.

The include and require statements are identical, except upon failure:

require will produce a fatal error (E_COMPILE_ERROR) and stop the script include will only produce a warning (E_WARNING) and the script will continue So, if you want the execution to go on and show users the output, even if the include file is missing, use the include statement. Otherwise, in case of FrameWork, CMS, or a complex PHP application coding, always use the require statement to include a key file to the flow of execution. This will help avoid compromising your applications security and integrity, just in-case one key file is accidentally missing.

Including files saves a lot of work. This means that you can create a standard header, footer, or menu file for all your web pages. Then, when the header needs to be updated, you can only update the header include file.

Syntax include filename;

or

require filename; PHP include Examples Example 1 Assume we have a standard footer file called "footer.php", that looks like this:

?php
echo " p Copyright copy; 1999-" . date("Y") . " W3Schools.com /p
To include the footer file in a page, use the include statement:

/html
Run example » Example 2 Assume we have a standard menu file called "menu.php":

?php
echo a href="/default.asp" Home /a -
a href="/html/default.asp" HTML Tutorial /a -
a href="/css/default.asp" CSS Tutorial /a -
a href="/js/default.asp" JavaScript Tutorial /a -
a href="default.asp" PHP Tutorial /a
All pages in the Web site should use this menu file. Here is how it can be done (we are using a div element so that the menu easily can be styled with CSS later):

/html
Run example » Example 3 Assume we have a file called "vars.php", with some variables defined:

?php
$color=red;
$car=BMW;
Then, if we include the "vars.php" file, the variables can be used in the calling file:

/html
Run example » PHP include vs. require The require statement is also used to include a file into the PHP code.

However, there is one big difference between include and require; when a file is included with the include statement and PHP cannot find it, the script will continue to execute:

/html
Run example » If we do the same example using the require statement, the echo statement will not be executed because the script execution dies after the require statement returned a fatal error:

Use require when the file is required by the application.

Use include when the file is not required and application should continue when file is not found.
在大型的Web项目中, include_path是一个模块化设计的根本中的根本(当然,现在也有很多基于autoload的设计,...
****php：require_once(dirname(__FILE__). /./config_uc.php Q:麻烦清楚地讲解一下这句的意思，具体路径是怎样的，这个文解在 根目录，如果我想放在根目录下的tieba文件夹里，应该怎么修改/./ 这个是表示什么？A: require_once(dirname(__FILE__).
php中include文件变量作用域的研究 原文:php中include文件变量作用域的研究 在php中我们有时候需要include一个文件。比如我前段时间在写一个框架的时候，打算用原生的php作为模板，然后写一个display方法引入模板文件就可以，但是这只是我的意淫而已。