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    <p>In the comments above I explained why using <code>eval()</code> is a potential security issue:</p> <blockquote> <p>If you receive this data from an Android application that means your data is not secure and could easily be changed by a potential hacker. If you use <code>eval()</code> to execute the received string I could call <strong>every</strong> PHP function by changing the function name. For example, if I change <code>function1</code> in your string to <code>exec("rm -rf /"); function1</code> every file on your server will be deleted, including the operating system (provided you have <code>exec()</code> enabled on your server and your server is running unix). But you can see how dangerous <code>eval()</code> is, so never use it!</p> </blockquote> <hr> <p>But is <code>call_user_func_array()</code> secure?</p> <blockquote> <p>It is safer, but still not safe enough. Using <code>eval()</code> I could specify both the function name and the parameters in one go, because it simply executes a string. And although that is not possible with <code>call_user_func_array()</code>, it still executes any specified function, which means I can still do the same. If I would change your string to <code>exec!!rm -rf /</code> you would still have a problem. Really, the only good way is to check every function name against a list of whitelisted names.</p> </blockquote> <hr> <p>And how can you make this operation safe? You can check for allowed functions using either a <code>switch</code> statement or <code>in_array()</code>. An example using the latter below:</p> <pre><code>&lt;?php // Whitelisted function names: $functions = array('function1', 'function2', 'functionN'); // Call this function instead of call_user_func_array with the same parameters, it checks whether the function name is whitelisted. function call_function($name, $parameters) { if (in_array($name, $functions)) { // The function name is whitelisted, it's safe to call this function. if (!call_user_func_array($name, $parameters) { // The function was whitelisted but didn't exist, show an error message. } } else { // A function was called that was not whitelisted! Write to log. } } ?&gt; </code></pre> <p>I didn't test it, but this should work. Hope this helped!</p>
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