ImpureStaticPropertyAccess

An impure function reads a static property, making it dependent on external state that can change unexpectedly.

Example

<?php
class Config {
    public static $debug = false;
}

function isDevelopment(): bool {
    return Config::$debug; // Depends on external static state
}

How to fix

Pass dependencies explicitly or use dependency injection:

<?php
class Config {
    private bool $debug;

    public function __construct(bool $debug) {
        $this->debug = $debug;
    }

    public function isDevelopment(): bool {
        return $this->debug;
    }
}