# Source: https://docs.datadoghq.com/security/code_security/static_analysis/static_analysis_rules/php-code-style/no-this-static.md

---
title: Do not use this in a static method
description: Datadog, the leading service for cloud-scale monitoring.
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  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > Do not use this in a static method
---

# Do not use this in a static method

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## Metadata{% #metadata %}

**ID:** `php-code-style/no-this-static`

**Language:** PHP

**Severity:** Error

**Category:** Error Prone

## Description{% #description %}

In PHP, `$this` is a special variable that is used to reference the current object. However, static methods are not associated with an object, but with a class. Therefore, `$this` is not available within a static method.

Ignoring this rule and attempting to use `$this` in a static method results in a fatal error because PHP cannot resolve `$this` without an instance of the class. It is critical to ensure that `$this` is not used in a static context to prevent such fatal errors.

To follow this rule, you should only use `$this` in non-static methods where it will refer to the current object instance. If you need to use a method or property in a static method, consider making that method or property static as well. For example, if you have a property that you need to access in a static method, you can declare it as `public static $property`, and then access it in the static method using `self::$property` instead of `$this->property`.

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```php
<?php
class Foo {
    public $debug;

    static function print() {
        if ($this->debug) {
            echo "Testing";
        }
    }
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```php
<?php
class Foo {
    public $debug;

    public function print() {
        if ($this->debug) {
            echo "Testing";
        }
    }
}
```
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