debug_print_backtrace doesn't work

Question

I have PHP 5.3.4 and when I try to use debug_print_backtrace, I don't get anything. When I use vardump, I get an empty array, as you can see below.

index.php:

<?php
define('WP_USE_THEMES', true);

require('./wp-blog-header.php');

var_dump(debug_backtrace());

echo PHP_VERSION;
?>

which returns

...
</html> 
array(0) {
}
5.3.4

Can anyone tell me what is wrong? I am expecting to see everything that was called in the run. Instead I don't see anything.

score 7 · Accepted Answer · answered Feb 09 '11 at 16:06

7

debug_backtrace() doesn't show you what has been called so far but the current call stack (i.e. more or less where php would jump to on a return statement until it reaches the top level) when the function is invoked.
You might be interested in a profiler like e.g. the one implemented in XDebug plus something to analyse the data like e.g. kcachegrind.

answered Feb 09 '11 at 16:06

VolkerK

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If you're in the very first PHP document loaded by your application, i.e. not in a function or include file, you can echo `__FILE__` and `__LINE__` to output the current file name and line number. – Michael Butler Feb 01 '12 at 15:40
For anyone seeing this page when using it properly and still not getting expected results: http://stackoverflow.com/questions/1252529/get-code-line-and-file-thats-executing-the-current-function-in-php – Dissident Rage Mar 12 '14 at 15:48

score 2 · Answer 2 · edited May 23 '17 at 11:56

2

If you're really after Code Coverage (which it sounds like from your description) then XDebug is useful, or see the responses to this SO question

edited May 23 '17 at 11:56

Community

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1

answered Feb 09 '11 at 16:23

Mark Baker

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debug_print_backtrace doesn't work

2 Answers2