php-internals Questions
1
Solved
Would the PHP engine optimize the second example to pass the $arr by reference?
function test1(array &$arr)
{
$arr[] = 123;
echo $arr[0];
}
function test2(array $arr)
{
echo $arr[0];
}
Apeak asked 16/12, 2015 at 17:43
3
I'm developing a PHP-extension, where an object method needs to return an array zval.
The method looks like:
ZEND_METHOD(myObject, myMethod)
{
zval **myArrayProperty;
if (zend_hash_find(Z_OBJPR...
Boorman asked 24/7, 2013 at 20:39
1
Solved
While working on my compiler I got this error:
Program received signal SIGSEGV, Segmentation fault.
__memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:33
How do I ...
Bluish asked 11/9, 2015 at 14:38
1
Solved
I research about class compilation, it's sequence, and logic.
If I declare a class before a simple parent:
class First extends Second{}
class Second{}
This will work OK. See live example acro...
Pallua asked 14/4, 2015 at 13:42
1
Solved
PHP 5.6 introduced hash_equals() function for safe comparison of password hashes and prevention of timing attacks. Its signature is:
bool hash_equals(string $known_string, string $user_string)
...
Vintner asked 12/1, 2015 at 22:8
1
Solved
Maybe this is weird question, but I can't work it out what happens internally in php when you write:
use garcha\path\class;
I'm not asking about purpose of namespaces, but about that statement i...
Confidant asked 4/9, 2014 at 19:46
4
Solved
I've always heard and searched for new php 'good writing practice', for example: It's better (for performance) to check if array key exists than search in array, but also it seems better for memory...
Lithography asked 1/8, 2014 at 13:27
5
Can someone explain how PHP implements associative arrays? What underlying data structure does PHP use? Does PHP hash the key and store it in some kind of hash map? I am curious because I was wonde...
Mindimindless asked 29/10, 2008 at 16:26
1
Solved
Is there any difference in PHP between while(true) and for(;;) besides syntax and readability?
Nethermost asked 7/4, 2014 at 14:53
6
Consider the code below:
<?php
$arr = array();
$arr['b'] = 'book';
foreach($arr as $key=>$val) {
print "key=>$key\n";
if(!isset($arr['a']))
$arr['a'] = 'apple';
}
?>
It is n...
Anoa asked 26/3, 2014 at 6:56
1
Solved
I often find references to the following quote being used when explaining that a PHP unset() doesn't trigger "garbage collection" immediately, but only when it sees fit (emphasis mine):
...
Cotter asked 27/11, 2013 at 0:14
2
Solved
When I installed Xdebug through pecl, it added the following line to my php.ini file.
extension="xdebug.so"
and everything I used worked. Until today.
Today I was having trouble setting up Xdeb...
Heal asked 18/11, 2009 at 18:18
2
In a blog post "PHP Internals: When does foreach copy", NikiC stated that in a code like this:
Snippet 1
$array = range(0, 100000);
foreach ($array as $key => $value) {
xdebug_debug_zva...
Luminary asked 11/8, 2013 at 14:51
1
NikiC stated in another thread:
Right before [a foreach] iteration the $array is "soft copied" for
use in foreach. This means that no actual copy is done, but only the
refcount of the zval of ...
Haileyhailfellowwellmet asked 10/8, 2013 at 3:55
5
Solved
Is there a way in PHP to determine whether a given variable is a reference to another variable and / or referenced by another variable? I appreciate that it might not be possible to separate detect...
Countable asked 27/1, 2011 at 14:28
7
Solved
Consider the following code sample:
$m_oDate = new DateTime('2013-06-12 15:54:25');
print_r($m_oDate);
echo $m_oDate->date;
Since PHP 5.3, this produces (something like) the following o...
Distal asked 12/6, 2013 at 12:53
1
Solved
When ref-assigning an array's element, the contents of the array are modified:
$arr = array(100, 200);
var_dump($arr);
/* shows:
array(2) {
[0]=>
int(100) // ← ← ← int(100)
[1]=>
int(200...
Hospitium asked 8/7, 2013 at 13:45
1
Solved
I've developed a PHP5 client extension for a server application i wrote, and so far it's working quite well, but it doesn't support persistent connections yet.
Since this is something i want to imp...
Harebell asked 5/7, 2013 at 8:26
1
Solved
I'm developing a PHP extension, using C. So far I'm working on the proper validation of arguments, passed to the extension's function from PHP userspace.
The macro ZEND_BEGIN_ARG_INFO_EX can be u...
Mclin asked 31/1, 2013 at 21:3
2
Solved
I wrote a PHP extension to access functions in a static lib, I built PHP as a CGI, and everything seemed to work (after days of working on it..)
Thrilled once everything worked, I re-compiled PHP ...
Hillman asked 2/1, 2013 at 15:36
1
Solved
I am trying to write an extension for php5.4 which basically wraps a very simple class in CPP.
This is for education purposes.
I find the way to do it in php5.4 has changed from php5.3
Where d...
Gide asked 31/12, 2012 at 19:47
1
Solved
The PHP documentation is not very explicit and only states that:
SplObjectStorage::offsetExists Checks whether an object exists in the storage. (PHP >= 5.3.0)
SplObjectStorage::contains Checks if...
Stannwood asked 16/8, 2012 at 8:8
1
Solved
i'm writing a php extension for my c++ library which is defined something like this:
bool getPids(map<string,string> pidsMap, vector<string> ids);
now, i'm writing a php wrapper for ...
Streamline asked 6/8, 2012 at 18:49
4
Solved
What are good resources to start learning the internals of PHP and the Zend Engine?
Linton asked 8/12, 2010 at 16:23
3
Solved
I'm dabbling with creating a PHP extension for a personal project. Beyond what's linked in the above article I have no knowledge of the zend_engine, and my C skills are 10 years out of date, and we...
Redness asked 19/3, 2012 at 16:31
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