Usage example analysis of auto_prepend_file and auto_append_file in PHP, autoprependfile_PHP tutorial

Analysis of usage examples of auto_prepend_file and auto_append_file in PHP, autoprependfile

The examples in this article describe the usage of auto_prepend_file and auto_append_file in PHP, which are more practical techniques in PHP programming. Share it with everyone for your reference. The specific method is as follows:

If necessary, require the file to the top and bottom of all pages.

The first method: add require statements at the top and bottom of all pages.
For example:

require('header.php');
//页面正文内容部分
require('footer.php');

But if you need to modify the top or bottom require file path with this method, you need to modify all page files. Moreover, each page needs to be added with a require statement, which is quite troublesome.

Second method: Use auto_prepend_file and auto_append_file to require files at the top and bottom of all pages.

There are two items in php.ini:

auto_prepend_file Load file at top of page
auto_append_file Load file at the bottom of the page

Using this method does not require changing any pages. When you need to modify the top or bottom require files, you only need to modify the values ​​​​of auto_prepend_file and auto_append_file.

For example: modify php.ini and modify the values ​​of auto_prepend_file and auto_append_file.

auto_prepend_file = "/home/fdipzone/header.php"
auto_append_file = "/home/fdipzone/footer.php"

Restart the server after modification, so that the top and bottom of all pages will require /home/fdipzone/header.php and /home/fdipzone/footer.php

Note: auto_prepend_file and auto_append_file can only require one php file, but this php file can require multiple other php files.

If you do not need all pages to require files at the top or bottom, you can specify the page file in a folder to call auto_prepend_file and auto_append_file
Add the .htaccess file to the folder where files need to be loaded at the top or bottom, with the following content:

php_value auto_prepend_file "/home/fdipzone/header.php"
php_value auto_append_file "/home/fdipzone/footer.php"

In this way, the page files in the specified .htaccess folder will load /home/fdipzone/header.php and /home/fdipzone/footer.php, and other page files will not be affected.

Using .htaccess settings is more flexible, does not require restarting the server, and does not require administrator rights. The only disadvantage is that every file that is read and interpreted in the directory must be processed every time, not at startup. Processed once, so performance will be reduced.

I hope this article will be helpful to everyone’s learning of PHP programming.

Usage, function and examples of return in php

return() will also terminate the execution of the eval() statement or script file. If called in the global scope, the current script file aborts running. If the current script file is include()ed or require()ed, control is returned to the calling file. Additionally, if the current script is include()ed, the return() value will be treated as the return value of the include() call. If return() is called in the main script file, the script aborts. If the current script file is specified by the configuration option auto_prepend_file or auto_append_file in php.ini, the script file is aborted. b.php

Usage, function and examples of return in php

If the return() statement is called within a function, execution of the function immediately ends and its arguments are returned as the function's values. return() also terminates the execution of the eval() statement or script file.

If called in the global scope, the current script file aborts execution. If the current script file is include()ed or require()ed, control is returned to the calling file. Additionally, if the current script is include()ed, the return() value will be treated as the return value of the include() call. If return() is called in the main script file, the script aborts. If the current script file is specified by the configuration option auto_prepend_file or auto_append_file in php.ini, the script file is aborted.

Example:
function min($a, $b){
return $a < $b ? $a : $b;//This is what to do For function return values, the following statements are no longer executed
$a++;
}
?>

a.php
include(" b.php");
echo "a";
?>
b.php
echo "b";
return;
echo "c";//This will not be executed
?>
The above result will output ba

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