register_tick_function() not work in external file

[rino1]

+ php main.php | grep f2 || echo "f2 function not appear"
f2 function not appear

Why?

Here are some details

+ ls -1
f2.php
main.php



+ cat main.php 
<?php
declare(ticks=1);
require 'f2.php'; // external file

register_tick_function(
    function () {
        debug_print_backtrace();
        echo "\n";
    }
);

function f1() {
    f2();
}

f1();



+ cat f2.php 
<?php
declare(ticks=1);
function f2() {}



+ php main.php 
#0 /tmp/tmp.UFjE757TrJ/main.php(9): {closure}()

#0 /tmp/tmp.UFjE757TrJ/main.php(13): {closure}()
#1 /tmp/tmp.UFjE757TrJ/main.php(16): f1()

#0 /tmp/tmp.UFjE757TrJ/main.php(16): {closure}()

[SakiTakamachi]

@rino1

function f2() {}

The reason is that this function has no content. Since there's nothing to execute, the tick does not fire.
Try adding an executable line like the following:

function f2() {
    $x = 1;
}

[rino1]

OK, but must remember to put declare(ticks=1) in each file you want to cover.
Isn't there a recursive (more reliable) method?

[iluuu1994]

There is no other solution for declare. This is not unique to ticks either, other declarations such as strict_types=1 also need to be repeated. There was a proposal for namespaced-scoped declares, but nothing came of it. https://wiki.php.net/rfc/namespace_scoped_declares

Honestly, the use-case for ticks is already slim and questionable (they were even suggested for deprecation & removal a few years ago if I remember correctly), so I don't think there's much interest in expanding support further.