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    <p><code>-&gt;</code> is used when referring to a member of an object.</p> <p><code>::</code> is the <a href="http://www.php.net/manual/en/language.oop5.paamayim-nekudotayim.php" rel="noreferrer">Scope Resolution Operator</a> and is used to refer to a static member of a Class.</p> <p>Consider the following class:</p> <pre><code>class FooBar { public static function fizz() { echo "Fizz"; } public function buzz() { echo "Buzz"; } } </code></pre> <p>You would call the function <code>buzz()</code> using <code>-&gt;</code>:</p> <pre><code>$myFooBar = new FooBar(); $myFooBar-&gt;buzz(); </code></pre> <p>But would use <code>::</code> to call the functon <code>fizz()</code>, as it is a static member (a member which doesn't require an instance of the class to be called):</p> <pre><code>FooBar::fizz(); </code></pre> <hr> <p>Also, while we are talking about the difference between <strong>static</strong> members versus <strong>instantiated</strong> members, you cannot use <code>$this</code> to refer to the current instance within <strong>static</strong> members. You use <a href="http://www.php.net/manual/en/language.oop5.static.php" rel="noreferrer"><code>self</code></a> instead (no leading <code>$</code>) which refers to the current class, or <a href="http://www.php.net/manual/en/language.oop5.static.php" rel="noreferrer"><code>parent</code></a> if you want to refer to the parent class, or if you have the pleasure of working with PHP 5.3.0, <a href="http://www.php.net/manual/en/language.oop5.late-static-bindings.php" rel="noreferrer"><code>static</code></a> (which allows for late static binding).</p> <hr> <p>The documentation uses <code>::</code> to refer to a function inside a class as the class name in the header is not an instance of the class. Still using the same example, a documentation entry referring to the function <code>buzz()</code> would use the following header:</p> <pre><code>FooBar::buzz </code></pre> <p>But unless the documentation specifies it's a static member, you will need to use <code>-&gt;</code> on an instance to call it:</p> <pre><code>$myFooBar = new FooBar(); $myFooBar-&gt;buzz(); </code></pre>
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    1. USAndrew Moore
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    1. COWas about to post, but this is pretty spot on. In short answer to John there is no difference. As Andrew states its a convention in the PHP manual to describe a class method as ClassName::methodName The intention is to use is as an object, i.e. $name->commit() unless it says otherwise in the documentation.
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