Get filename and line number of start of function declaration

Question

Possible Duplicate:
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?

@CodeCaster: disagree with that duplicate. This is about knowing the line and file of where a function's defined, not the file name of the file that we're in... — ircmaxell, Nov 02 '11 at 14:28
@ircmaxell he wants a function itself (which is being executed, so `__FILE__` and `__LINE__` are set) to show where it is. — CodeCaster, Nov 02 '11 at 14:30

score 12 · Accepted Answer · answered Nov 02 '11 at 14:28

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.

Ben Swinburne · Answer 2 · 2011-11-02T14:46:55.950

0

$backtrace = debug_backtrace();
$line = $backtrace[0]['line'];
$file = $backtrace[0]['file'];

http://www.php.net/manual/en/function.debug-backtrace.php

edited Nov 02 '11 at 14:46

answered Nov 02 '11 at 14:25

Ben Swinburne

25,669
10
69
108

\_\_LINE__ is the current line, and not a "line number of the start of a function declaration" – Fedir RYKHTIK Nov 02 '11 at 14:33
Fair point. Added another method. – Ben Swinburne Nov 02 '11 at 14:37
The same : "line - integer - The current line number." http://www.php.net/manual/en/function.debug-backtrace.php – Fedir RYKHTIK Nov 02 '11 at 14:40
Current depending on context, although I did get my array indexes the wrong way around. See the zeroth element in the first example. ["file"] => string(10) "/tmp/a.php" ["line"] => int(10) – Ben Swinburne Nov 02 '11 at 14:46

score 0 · Answer 3 · answered Nov 02 '11 at 14:30

0

The function name could be found with PHP exceptions, which are more interesting for error triggering : http://www.php.net/manual/en/exception.gettrace.php

answered Nov 02 '11 at 14:30

Fedir RYKHTIK

9,844
6
58
68

Get filename and line number of start of function declaration

3 Answers3

Linked