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    <p>The reason your code doesn't work is you aren't actually passing a callback. You're just calling that function and passing the return value. A callback in PHP is usually either a string with the function name or an array for object methods.</p> <pre><code>$this-&gt;memcache-&gt;addServer('192.168.1.35', '11211', 0, 50, 10, TRUE, array($this, '_call_memecache_failure'); </code></pre> <p>The parameters should be passed by the function. You can learn more about how callbacks work in PHP <a href="http://www.php.net/manual/en/language.pseudo-types.php#language.types.callback" rel="nofollow noreferrer">in the documentation</a></p> <p>Examples (from the docs):</p> <pre><code>&lt;?php // An example callback function function my_callback_function() { echo 'hello world!'; } // An example callback method class MyClass { static function myCallbackMethod() { echo 'Hello World!'; } } // Type 1: Simple callback call_user_func('my_callback_function'); // Type 2: Static class method call call_user_func(array('MyClass', 'myCallbackMethod')); // Type 3: Object method call $obj = new MyClass(); call_user_func(array($obj, 'myCallbackMethod')); // Type 4: Static class method call (As of PHP 5.2.3) call_user_func('MyClass::myCallbackMethod'); // Type 5: Relative static class method call (As of PHP 5.3.0) class A { public static function who() { echo "A\n"; } } class B extends A { public static function who() { echo "B\n"; } } call_user_func(array('B', 'parent::who')); // A ?&gt; </code></pre>
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    1. USChristopher Tarquini
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    1. COHi Chris! Thanks a lot for an extensive reply. However, it's not working as you say. I have tried to call the callback function with both your example ( array($this, '_call_memecache_failure') ) as well as what's shown at PHP.net ( '_call_memecache_failure' ). Do you have any ideas?
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    2. COActually, straight from your excample, here's whats happen: Message: Memcache::addserver() expects parameter 7 to be boolean, array given
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    3. COLooks like it's missing an argument before the callback. Double check to make sure you're calling the function correctly (I just copied your function call and changed the callback). I think you're missing the $status argument or something. I've never used memecache so I don't know what the arguments mean
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      1. USChristopher Tarquini
 

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