如何检查php函数中的返回值

Question

here is my piece of php code:

Excel::load(Input::file('file'), function ($reader) {
    some_function();
});

my question is how to get the return value of some_function() and to check it if it is true, right after the execution of the Excel::load() block ? But please without the use of try-catch-block !

Answer 1

Use a returnvalue argument by reference, so that you can access it outside of the callback

$returnValue = null;
Excel::load(Input::file('file'), function ($reader) use (&$returnValue) {
    $returnValue = some_function();
});
if ($returnValue) {
    // Do stuff
}