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POInject code in a PHP closure
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5143127
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0
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3
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2011-02-28T14:16:55.460
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2012-12-24T00:50:29.253
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2012-12-24T00:50:29.253
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367456
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2
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1494
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I have an already defined closure and I want to inject code inside when I execute it. Here is an example: <pre><code>$predefined = "print 'my predefined injected code ';"; $closure = function () { print 'hello '; }; call_user_func_array($closure, array()); // output : hello </code></pre> I want to mix 2 codes : a predefined one and the closure's one. After modification, I want my closure to look like this <pre><code>$closure = function () { print 'my predefined injected code '; print 'hello '; }; </code></pre> Is it possible to insert some code in the closure before executing it ? Note: I can not use "create_function" that take the code as a string, so can be modified easily. The closures are already defined and are defined in a certain way (through a function that take a callback arg, not a string arg). Thanks for your help. <hr> EDIT: Here is the solution <pre><code>function hackClosure($closure, $inject_code) { $reflection = new ReflectionFunction($closure); $tmp = $reflection->getParameters(); $args = array(); foreach ($tmp as $a) array_push($args, '$'.$a->getName() . ($a->isDefaultValueAvailable() ? '=\''.$a->getDefaultValue().'\'' : '')); $file = new SplFileObject($reflection->getFileName()); $file->seek($reflection->getStartLine()-1); $code = ''; while ($file->key() < $reflection->getEndLine()) { $code .= $file->current(); $file->next(); } $start = strpos($code, '{')+1; $end = strrpos($code, '}'); return create_function(implode(', ', $args), substr($code, $start, $end - $start) . $inject_code); } $theClosure = function () { print 'something'; }; $inject_code = "print ' to say';"; $func = hackClosure($theClosure, $inject_code); $func(); </code></pre> It renders <pre><code>something to say </code></pre> instead of <pre><code>something </code></pre>
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<php><oop><closures>
Title
Inject code in a PHP closure
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