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12503173
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2012-09-19T21:29:27.563
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2012-09-19T21:29:27.563
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1522117
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<h2>What you are looking for is : <a href="http://php.net/manual/en/reflectionfunctionabstract.getnamespacename.php" rel="nofollow">ReflectionFunctionAbstract::getNamespaceName</a></h2> If you want to know where you're coming from <a href="http://php.net/manual/en/function.debug-backtrace.php" rel="nofollow">debug_backtrace()</a> is your friend. The following should solve your puzzle: <pre><code>function backtrace_namespace() { $trace = array(); $functions = array_map( function ($v) { return $v['function']; }, debug_backtrace() ); foreach ($functions as $func) { $f = new ReflectionFunction($func); $trace[] = array( 'function' => $func, 'namespace' => $f->getNamespaceName() ); } return $trace; } </code></pre> Just call it from anywhere to see the backtrace. I modified your "procedural" code file as follows: <pre><code>namespace Foo; function bar () { var_export(backtrace_namespace()); } /** The unasked question: We need to use the fully qualified name currently. */ function go() { \Site\Action\add('hookname', 'Foo\\bar'); } go(); </code></pre> The Result from including this file will be the following on stdout: <pre><code>array ( 0 => array ( 'function' => 'backtrace_namespace', 'namespace' => '', ), 1 => array ( 'function' => 'Foo\\bar', 'namespace' => 'Foo', ), 2 => array ( 'function' => 'call_user_func', 'namespace' => '', ), 3 => array ( 'function' => 'Site\\Action\\add', 'namespace' => 'Site\\Action', ), 4 => array ( 'function' => 'Foo\\go', 'namespace' => 'Foo', ), ) </code></pre> Now for bonus points the answer to the hidden question: <h2>How do I resolve the calling namespace to avoid using fully qualified function name as argument?</h2> The following will allow you to call the function as you intended: <pre><code> Site\Action\add('hookname', 'bar'); </code></pre> Without getting the dreaded: <blockquote> Warning: call_user_func() expects parameter 1 to be a valid callback, function 'bar' not found or invalid function name </blockquote> So before you redesign try this on for size: <pre><code>namespace Site\Action; function add($hook, $function) { $trace = backtrace_namespace(); $prev = (object) end($trace); $function = "$prev->namespace\\$function"; if (is_callable($function)) call_user_func($function); } </code></pre> I see no reason why <code>debug_backtrace</code> should not be used, this is what it is there for. nJoy!
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1. COYou can also use the fully qualified function name from debug back_trace directly. Something like: `$trace = debug_backtrace(); $trace = (object) end($trace); call_user_func(substr($trace->function, 0, strrpos($trace->function, '\\')+1).$function);` that should work. /me crossing fingers...
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