What are the differences between php include and include_once?

The difference between include and include_once is: include will load the specified file and execute the program inside, and repeat the inclusion multiple times; the include_once function will load the specified file and execute the program inside. If the If the file has already been included, it will not be included again.

The difference between include and include_once

include will load the specified file and execute the program inside; repeat The reference is included multiple times.

include_once function will load the specified file and execute the program inside; this behavior is similar to the include statement, the only difference is that if the file has already been included, it will not be included again.

include

<?php
include "index.php";
// 其他代码
//
include "index.php";
?>

include_once

<?php
include_once "index.php";
// 其他代码
//
include_once "index.php";
?>

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