如何显示导致异常的行，而不是异常发生的位置？

Question

If a function throws an exception because the calling code does not call it properly, how do I make the error show the file and line number of the calling code instead of (or in addition to) the line where the exception is thrown?

ie:

class MyClass {
   public function __call($MethodName, $Parameters)
   {
       if (!property_exists($this, $PropertyName))            
         throw new Exception('Error Getting Property: ' . $PropertyName . ' does not exist!');
       // THIS line number appears in the exception, but
       // is useless because it isn't the problem.
   }
}


$MyClass = new MyClass();
// THIS line number should be in the exception,
// since its the line that's wrong.
$MyClass->GetSomethingThatDoesNotExist(); 

Answer 1

There's a few options for this;

Roll your own

Using the debug_print_backtrace() function in PHP you can make something to display your own output.

Pre built libraries to output the stack trace

You can also install the awesome whoops package to get a nicer output of the problem and how the code got there, check it out here: https://github.com/filp/whoops

Xdebug

This is the preferred due to better var_dump() output among other huge advantages. Once installed, it just makes all your debugging and error output much more insightful and easier to read.

Install xdebug to display a more verbose output of the whole flow of events that lead to the issue, known as the stack trace.