Question

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How to find out where a function is defined?
included php file to know it's file name?

Can I get the filename and line number of the start of a function declaration in PHP?

Say, I have the following code:

 1. /**
 2.  * This function shows the foo bar.
 3.  */
 4. function foo_bar($subject) {
 5.     echo "Foo bar:\n";
 6.     if ($subject == "none") {
 7.         trigger_error("Wrong argument given to 'foo_bar()' in ... on line ....", E_USER_WARNING);
 8.     }
 9.     ...
10. }

When I call foo_bar("none"), the function must throw an error like this:

Warning: Wrong argument given to ‘foo_bar()’ in /home/web/mcemperor on line 4.

Can I retrieve the filename and the line number of start of the function declaration?

Answer 1

You’re looking for ReflectionFunction.

$r = new ReflectionFunction('foo_bar');
$file = $r->getFileName();
$startLine = $r->getStartLine();

It’s that simple… It works for any defined function, whatever one that you passed in to the constructor argument.