Questions tagged [php-internals]
How the PHP programming language works underneath, and questions about the underlying C code.
php-internals
268
questions
1
vote
1
answer
507
views
How can I overwrite an internal Zend function with a PHP extension?
Hope this isn't too silly a question to ask. I'm fairly new to C and PHP internals but looking to learn more about them.
I've recently began looking into development of PHP extensions. I'm trying to ...
- 11
0
votes
1
answer
77
views
Passing HashTable data from php.ini to an extension method: corrupted values
I am trying to make a PHP (7.4) extension use in an extension method a setting from php.ini (like myext.map=key1=val1,key2=val2;) parsed as an associative array. I want the parsing to happen in ...
- 4,284
0
votes
1
answer
92
views
Are `zval *retval` argument and the `zval *` return value of the `zend_call_method` the same?
Is the zval * value returned by the zend api method zend_call_method same as the zval *retval argument passed into it?
I can see that zend_call_method is declared in zend_interfaces.h. I tried ...
- 20.3k
4
votes
1
answer
700
views
Why does php allow invalid return type declerations it knows it can't allow?
As far as I can tell php has the ability to prevent a return type from being declared where it knows it's problematic.
class Foo {
public function __clone(): Baz {
return new Baz;
}
}
...
- 83
4
votes
1
answer
930
views
Where is the source code for strlen() function in PHP?
I was looking through php-src/Zend/zend_API.c and couldn't find the source code for the strlen() function in PHP anywhere. Grepping through the code base didn't really help as it's littered with libc ...
- 83
2
votes
3
answers
2k
views
How come usort (php) works even when not returning integers?
Yesterday at work I stumbled upon a piece of code that was roughly like this:
uasort($array, function($a, $b) {
return isset($a['sort_code']) && isset($b['sort_code']) && $a['...
- 21
8
votes
3
answers
432
views
Duplicate array keys (Notice: member variable "a" returned from __sleep() multiple times)
The title may seem a bit silly but I'm totally serious with this. Today at work I came across a weird PHP behaviour which I could not explain. Luckily this behaviour is fixed in PHP 7.4, so it seems ...
- 2,749
2
votes
1
answer
226
views
Does mysqli_close() do anything other than just destroying the object?
I know that using mysqli_close() is not needed, because PHP will destruct the object when the script is finished.
What I would like to know is why do we have such a function in the language in the ...
- 32.6k
0
votes
1
answer
425
views
Segfault Error when using zend_call_function()
i am trying to warp a C library around a PHP class using PHP's Zend Engine. The constructor function of the class is supposed to take a string and a function pointer. I was able to fetch strings ...
- 1,018
1
vote
1
answer
277
views
What is causing this strange memory corruption in my test PHP extension?
I recently needed a list of compiled-in signal names so I could print nice messages like "Interrupted by SIGINT (2)".
get_defined_constants() is unusable for this as it jumbles SIGINT, SIGTRAP etc in ...
- 1,961
2
votes
1
answer
540
views
pdo_module.obj : error LNK2019: unresolved external symbol "int __cdecl php_pdo_register_driver(struct pdo_driver_t *)"
LINK: unresolved external symbol :php_pdo_register_driver
I'm writing a PHP PDO ext demo with PHP7.2.21, when I tried to register my ext on PDO, I got an error.
PHP_MINIT_FUNCTION(pdo_my_mysql) {
#...
- 81
0
votes
1
answer
162
views
Is there a way in php to count the nested stucture level?
I'm experimenting with a way to more easily debug Cronjob Scripts with PHP.
without having xdebug etc. accessible on the server.
For this, I'd like to get the number of nested structures the code ...
- 137
0
votes
0
answers
52
views
PHP API Reflection
I want to find where such messages are generated at a low level.
Uncaught TypeError: Argument 1 passed to A::__construct() must be an instance of B
I downloaded the source PHP 7. And tried to find ...
- 121
11
votes
2
answers
1k
views
Why is in_array strict mode on integers slower than non-strict mode?
I always thought that in_array strict mode will be faster or at least the same speed as non-strict mode. But after some benchmarks I noticed there is a huge difference in execution time between them ...
- 379
4
votes
1
answer
371
views
Why increasing refcount of zval not working?
I'm dumping a zval container running on PHP version 7.3.5 (opcache is activated and PHP is thread safe enabled) following this given code :
<?php
$a = "new string";
$b = $a;
xdebug_debug_zval( '...
- 131