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copied!<p>There is at leat two differences between <a href="http://php.net/forward_static_call_array" rel="noreferrer"><code>forward_static_call_array</code></a> and <a href="http://php.net/call_user_func_array" rel="noreferrer"><code>call_user_func_array</code></a> :</p> <ul> <li>The first one only exists since PHP 5.3</li> <li>The first one must be called from inside a class</li> </ul> <p>After that, I suppose there is some difference that's related to Late Static Binding, that was introduced with PHP 5.3.</p> <p><br> Actually, if you take a closer look at the given example, it seems to be exactly that : the "context" of the class inside which you are using <code>forward_static_call_array</code> is "kept", in the called method.</p> <p>Considering this portion of code, that's derived from the given example :</p> <pre><code>class A { const NAME = 'A'; public static function test() { $args = func_get_args(); echo static::NAME, " ".join(',', $args)." \n"; // Will echo B } } class B extends A { const NAME = 'B'; public static function test() { echo self::NAME, "\n"; // B forward_static_call_array(array('A', 'test'), array('more', 'args')); } } B::test('foo'); </code></pre> <p>You'll get this output :</p> <pre><code>B B more,args </code></pre> <p>i.e. from the method in class A, you "know", via the <code>static::</code> keyword, that you're "coming from B".</p> <p><br> Now, if you try to do the the same thing with <code>call_user_func</code> :</p> <pre><code>class B extends A { const NAME = 'B'; public static function test() { echo self::NAME, "\n"; // B call_user_func_array(array('A', 'test'), array('more', 'args')); } } </code></pre> <p><em>(the rest of the code doesn't change)</em></p> <p>You'll get this output :</p> <pre><code>B A more,args </code></pre> <p>Note the <strong>A</strong> on the second line ! With <code>forward_static_call_array</code>, you didn't get an <strong>A</strong>, but a <strong>B</strong>.</p> <p>That's the difference : <code>forward_static_call_array</code> forwards the static context to the method that's called, while <code>call_user_func_array</code> doesn't.</p> <p><br> About your efficiency question : I have no idea -- you'd have to benchmark ; but that's really not the point : the point is that those two functions don't do the same thing.</p>

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