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php - PHPStorm: undefined variables caused by include/require

Hello everyone,

I am currently working on a PHP project using PHPStorm as my IDE, and I have come across an issue regarding undefined variables when using the include/require function.

Here is the scenario:

I have a main PHP file, let's call it "index.php". Within this file, I am using the include/require function to include another PHP file, let's call it "function.php". In "function.php", I have defined some variables that I want to use in "index.php".

However, when I try to access these variables in "index.php", PHPStorm is highlighting them as undefined. Despite this, the code still runs without any errors and the variables are functioning as expected.

But, this highlighting is making it difficult for me to quickly identify other legitimate undefined variables in my code. Is there any way to suppress this warning in PHPStorm specifically for the include/require statements or for these specific variables?

I would really appreciate any guidance or suggestions on how to resolve this issue. Thank you in advance for your help!

Best regards,
[Your Name]

All Replies


Hi [Your Name],

I understand the frustration caused by PHPStorm highlighting variables as undefined when using the include/require function. I have dealt with this issue as well, and after some trial and error, I found an alternative approach that might work for you.

Instead of using the include/require statements directly in "index.php", you could try using the PHP `namespace` feature and autoloading mechanism. By organizing your code into separate classes or functions and defining namespaces for them, you can utilize autoloading to automatically load the required files.

First, make sure to define appropriate namespaces in your "function.php". This can be done using the `namespace` keyword at the beginning of the file, like:

namespace MyNamespace;

// Code for defining functions and classes

Then, in "index.php", use the `spl_autoload_register` function to register an autoloader function or callback. This function will load the required files automatically based on the class or function names you use in "index.php". Here's an example:

spl_autoload_register(function ($className) {
$file = __DIR__ . '/' . str_replace('\\', '/', $className) . '.php';
if (file_exists($file)) {

With this approach, PHPStorm should no longer highlight the variables as undefined because the autoloading mechanism will ensure that the necessary files are loaded when needed.

Give it a try, and hopefully, this method will help you overcome the issue you're facing. If you have any further questions or need clarification, feel free to ask. I'm here to help!

Best regards,
User 2


Hey there [Your Name],

I've encountered a similar issue before with PHPStorm and undefined variables caused by include/require statements. In my case, it turned out to be a false positive warning from the IDE. PHPStorm sometimes has trouble recognizing variables defined in included files, even though they are actually being loaded and available at runtime.

To suppress this warning for specific files or variables, you can utilize PHPDoc annotations. In your "index.php" file, add a PHPDoc comment above the line where you include the "function.php" file. Inside this comment, you can use the `@noinspection` annotation followed by the warning you want to suppress, like `@noinspection PhpIncludeInspection`. This should prevent PHPStorm from highlighting the variables as undefined.

For example:

/** @noinspection PhpIncludeInspection */
require_once 'function.php';

Additionally, if you want to suppress the warning for specific variables declared in "function.php", you can use the `@var` annotation in PHPDoc comments. This tells PHPStorm the type of the variable and avoids the undefined variable warning. Here's an example:

/** @var string $myVariable */
$myVariable = 'Hello';

By utilizing these PHPDoc annotations, you can suppress the specific warnings caused by include/require statements and ensure that your code is properly flagged for other legitimate undefined variables.

I hope this helps you to resolve the issue! Let me know if you have any other questions or if there's anything else I can assist you with.

Best regards,
User 1

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