staticClassAccess.privateProperty

Code example

<?php declare(strict_types = 1);

class Counter
{
	private static int $count = 0;

	public function increment(): void
	{
		static::$count++;
	}
}

Why is it reported?

Accessing a private static property through static:: instead of self:: is unsafe. The static:: keyword uses late static binding, which resolves to the class that actually calls the method at runtime. If a child class calls this method, static:: would resolve to the child class, but private properties are not inherited and belong only to the declaring class. This can lead to unexpected behavior.

How to fix it

Use self:: instead of static:: to access private static properties, since they belong exclusively to the declaring class.

 <?php declare(strict_types = 1);

 class Counter
 {
 	private static int $count = 0;

 	public function increment(): void
 	{
-		static::$count++;
+		self::$count++;
 	}
 }