How to prevent others from directly accessing php files

How to prevent others from directly accessing php files

You can judge whether a certain constant is defined or whether the defined value is the same. If it is not If the definition or value is different, the script will stop running.

defined('IS_ALLOW') or die('禁止访问！');

Access result: Access prohibited!

If you need to reference it in other php files, you can define the constant first and then reference it.

A.php

defined('IS_ALLOW') or die('禁止');

echo "访问成功！";

B.php

define('IS_ALLOW', true);

require './A.php';

Result of accessing B.php: Access successful!

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