如何在循环中“取消声明”自定义 function

Question

I am collecting a series of php files and testing to see if a single function returns valid output. To facilitate the process, all their functions are named identically. So then I can run:

foreach($fileList as $file) {

    require($file);
    echo $testFunction();

}

The problem is that php throws an error 'Cannot redeclare function' since the second file's function is named the same as the first. What I want to do is 'undeclare' a function after I test its output but I know this isn't possible and I'm trying to handle this procedurally. unlink($file) does not remove the instance of the function, unfortunately. Is there a simple way to handle this without using an OOP approach?

Answer 1

You can execute the files in another process, for example (assuming $testFunction is defined in the files), you could do something like this (assuming you are running on Linux):

foreach($fileList as $file) {
    // load code from the current file into a $code variable,
    // and append a call to the function held in the $testFunction variable
    $code = file_get_contents($file) . "\n" . '$testFunction()';

    // save this to a temporary file
    file_put_contents('/tmp/test-file.php', $code);

    // execute the test file in a separate php process,
    // storing the output in the $output variable for examination
    $output = shell_exec('/tmp/test-file.php');

    // examine output as you wish
}

unlink('/tmp/test-file.php');