Doc #78218 [Nab]: function intercepts execution of code that is not executed

From: Date: Wed, 26 Jun 2019 14:30:39 +0000
Subject: Doc #78218 [Nab]: function intercepts execution of code that is not executed
References: 1  Groups: php.doc.bugs 
Request: Send a blank email to doc-bugs+get-16777@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=78218&edit=1

 ID:                 78218
 User updated by:    lozinskiy dot artem at gmail dot com
 Reported by:        lozinskiy dot artem at gmail dot com
 Summary:            function intercepts execution of code that is not
                     executed
 Status:             Not a bug
 Type:               Documentation Problem
 Package:            Unknown/Other Function
 Operating System:   Ubuntu 18.04 LTS
 PHP Version:        7.1.30
 Block user comment: N
 Private report:     N

 New Comment:

But why on line 30 this function executed?
After all, up to 30 lines the cycle must be completed and the code will not be executed further.


Previous Comments:
------------------------------------------------------------------------
[2019-06-26 14:14:27] requinix@php.net

Because the very first thing that happens when execution enters the function is that execution
immediately leaves the function. And as documented, "not all statements are tickable".

------------------------------------------------------------------------
[2019-06-26 14:05:19] lozinskiy dot artem at gmail dot com

Description:
------------
---
From manual page: https://php.net/function.register-tick-function
---
PHP Version 7.1.30-1+ubuntu18.04.1+deb.sury.org+
Linux ubuntu 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64
---

function intercepts execution of code that is not executed

Test script:
---------------
<?php
declare(ticks=1);

function my_function() {

    echo print_r(debug_backtrace(), 1) . '<br/>';
    
}

register_tick_function('my_function', true);

$t = false;
$ar = ['test1' => '111'];

var_dump('->' . __METHOD__ . ' on ' . __FILE__ . ':' . __LINE__);

foreach ($ar as $k => $e) {
    
    $t = ($k === 'test2');
    
    var_dump('$t==='. var_export($t, 1));
    
    if ($t===false) {
        continue;
    }
    
    var_dump('this line code is not executed (execute "continue")');
    
    test2();
    test3();    // this will handled or ..
    // test4(); // uncomment this and this will handled (but function not exist)
}

var_dump('->' . __METHOD__ . ' on ' . __FILE__ . ':' . __LINE__);

function test2() {
    // this never handled (why? =))
    return 1;
}

function test3() {
    var_dump('->' . __METHOD__ . ' on ' . __FILE__ . ':' .
__LINE__);
}

Expected result:
----------------
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 10
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 12
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 13
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:15:string '-> on
/var/www/test.local/public/test/tick.php:15' (length=49)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 15
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 19
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:21:string '$t===false' (length=10)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 21
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:34:string '-> on
/var/www/test.local/public/test/tick.php:34' (length=49)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 34
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 39
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 43
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 

Actual result:
--------------
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 10
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 12
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 13
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:15:string '-> on
/var/www/test.local/public/test/tick.php:15' (length=49)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 15
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 19
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:21:string '$t===false' (length=10)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 21
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 30
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
/var/www/test.local/public/test/tick.php:34:string '-> on
/var/www/test.local/public/test/tick.php:34' (length=49)
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 34
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 39
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 
Array ( [0] => Array ( [file] => /var/www/test.local/public/test/tick.php [line] => 43
[function] => my_function [args] => Array ( [0] => 1 ) ) ) 

---
that wrong...
---
on line 30 function intercepted execution on this line


------------------------------------------------------------------------



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