Question

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How to find out where a function is defined?
get filename of extended class

Working on non OO codes in PHP, I sometimes find myself digging through code to find something as simple as “where that function sits“.

function myfunction(){
    where_is_this_function();   
}

My question is, how can i find where is the file where the where_is_this_function() sits

I know there are debuggers, find in files tools and other options, but i would like to know if there is any programmatic way to do so like, because sometimes it’s more handy.

get_thefunction_file('where_is_this_function()')

Answer 1

You can use debug_print_backtrace(); in that function it should pretty-print how it was called and from what file

function myfunction(){
    debug_print_backtrace();//where_is_this_function();   
}

and output a numbered list like

#0  myfunction() called at [/tmp/include.php:10]
#1  include(/tmp/include.php) called at [/tmp/test.php:3]