Question

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How to find out where a function is defined?

I have a fairly complex OOP PHP project with lots of classes, libraries and helpers to work with.

While debugging, I sometimes find it hard to locate which instance of a specific function is used in when it exists in different files or classes and I can’t tell which class or library was included without looking through the entire code to this point.

I was wondering if there is a language construct, a function or even an external tool (e.g. a debugger) that can help me locate exactly in which file and on which line is a specific function located.

E.g. something like:

moditem(25); // How I call the function usually
echo locate_function('moditem');

To display something like:

Function moditem() is located in file: lib/users.php, line 234.

Here’s a snippet:

...
return TRUE;
}

function moditem($id){
    $modify = $this->modify($id);
    return $modify;
}
...

My IDE has a way to lead me to the function declaration, but it gets confused when I have 20 files that have a different version of the function with the same name.

Answer 1

$ref = new ReflectionFunction('moditem');
echo $ref->getFileName();

See http://php.net/reflectionfunction and similar related reflection methods.