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    <p>Let's assume this is your class:</p> <pre><code>class Test { private $baz = 1; public function foo() { ... } public function bar() { printf("baz = %d\n", $this-&gt;baz); } public static function staticMethod() { echo "static method\n"; } } </code></pre> <p>From within the <code>foo()</code> method, let's look at the different options:</p> <pre><code>$this-&gt;staticMethod(); </code></pre> <p>So that calls <code>staticMethod()</code> as an instance method, right? It does not. This is because the method is declared as <code>public static</code> the interpreter will call it as a static method, so it will work as expected. It could be argued that doing so makes it less obvious from the code that a static method call is taking place.</p> <pre><code>$this::staticMethod(); </code></pre> <p>Since PHP 5.3 you can use <code>$var::method()</code> to mean <code>&lt;class-of-$var&gt;::</code>; this is quite convenient, though the above use-case is still quite unconventional. So that brings us to the most common way of calling a static method:</p> <pre><code>self::staticMethod(); </code></pre> <p>Now, before you start thinking that the <code>::</code> is <em>the</em> static call operator, let me give you another example:</p> <pre><code>self::bar(); </code></pre> <p>This will print <code>baz = 1</code>, which means that <code>$this-&gt;bar()</code> and <code>self::bar()</code> do exactly the same thing; that's because <code>::</code> is just a scope resolution operator. It's there to make <code>parent::</code>, <code>self::</code> and <code>static::</code> work and give you access to static variables; how a method is called depends on its signature and how the caller was called.</p> <p>To see all of this in action, see <a href="http://3v4l.org/DnSUk" rel="noreferrer">this 3v4l.org output</a>.</p>
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