Magic methods are implicitly invoked by a programming language when some event or language construct is used.
Questions tagged [magic-methods]
616 questions
21
votes
2 answers
PHPDoc and __callStatic
tl;dr
What is the correct way to annotate (in PHPDoc) functions implemented via __callStatic? More important: is there a way that will make NetBeans and PHPStorm understand that these are static methods?
Motivation
If you want the bigger picture,…
abesto
- 2,331
- 16
- 28
21
votes
2 answers
Custom double star operator for a class?
How does one implement custom double star operator (**) for unpacking, similar to how __iter__ works with single star operator (*)?
For example:
class PlayerManager(object):
def __init__(self, players=None):
self.players = players or…
Markus Meskanen
- 19,939
- 18
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- 119
21
votes
6 answers
How to make inline array initialization work like e.g. Dictionary initialization?
Why is it possible to initialize a Dictionary like this:
var dict = new Dictionary() {
{ "key1", 1 },
{ "key2", 2 }
};
...but not to initialize, say, an array of KeyValuePair objects in exactly the same way:
var…
McGarnagle
- 101,349
- 31
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20
votes
4 answers
PHP Arrayable Interface
I'm sure I read a while back about a new feature of PHP that was either a new magic method or a new interface so that you could implement Arrayable methods.
eg
interface Arrayable
{
public function toArray();
}
Was I imagining it?
gawpertron
- 1,867
- 3
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- 37
19
votes
3 answers
__callStatic(): instantiating objects from static context?
I am confused about how "static" and "dynamic" functions and objects in PHP work together especially with regards to __callStatic().
How __callStatic() works:
You can have a normal class MyClass, where within the class you can
put a static…
Dennis
- 7,907
- 11
- 65
- 115
19
votes
1 answer
Paste a string as a variable, not as executable code snippet, into IPython
I'm aware of the magic IPython %paste command, which is quite useful, if you have valid code to insert. Now I don't want to insert code, I just want to store some string from the copy buffer as a variable. Is there a simpler way to do that, except…
Michael
- 7,316
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18
votes
3 answers
What are the names of the magic methods for the operators "is" and "in"?
I would like to make bool binary operations using the magic methods for these operators. For example, I can get a < b as getattr(a, '__lt__')(b) or a == b as getattr(a, '__eq__')(b).
Can I get a in b and a is b in such a way?
nik
- 265
- 2
- 9
18
votes
2 answers
Triggering __call() in PHP even when method exists
The PHP documentation says the following about the __call() magic method:
__call() is triggered when invoking inaccessible methods in an object context.
Is there a way I can have __call() called even when a method exists, before the actual method…
Chad Johnson
- 21,215
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17
votes
1 answer
How to use interfaces and magic methods in PHP
I want to use interfaces, but some of my implementations rely on magic methods such as __invoke and __call. I have to remove signatures of methods that may be invoked magically (in any implementation) from the interface. Which leads to the anti…
Emanuel Landeholm
- 1,396
- 1
- 15
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15
votes
2 answers
Check if a property exists on magically set properties
There is a lot of SO questions about the subject, notably this one, but it does not help me.
There is an ambiguity between property_exists and isset so before asking my question, I'm going to pointing it out:
property_exists
property_exists checks…
Alain Tiemblo
- 36,099
- 17
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- 153
15
votes
4 answers
How to implement __iadd__ for a Python property
I'm trying to create a Python property where in-place adding is handled by a different method than retrieving the value, adding another value and reassigning. So, for a property x on an object o,
o.x += 5
should work differently than
o.x = o.x +…
ptomato
- 56,175
- 13
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- 165
14
votes
5 answers
Is there any case where len(someObj) does not call someObj's __len__ function?
Is there any case where len(someObj) does not call someObj's __len__ function?
I recently replaced the former with the latter in a (sucessful) effort to speed up some code. I want to make sure there's not some edge case somewhere where len(someObj)…
David Locke
- 17,926
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14
votes
2 answers
What is the real purpose of magic method __set_state in PHP?
I'm learning about magic methods, reading every site, taking every example, but nothing makes sense to me. Examples like this:
class A
{
public $var1;
public $var2;
public static function __set_state($an_array) // As of PHP 5.1.0
{
…
Red Vulpine
- 433
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- 17
14
votes
3 answers
Why PHP uses static methods in object context?
I have the following code (like, for real, this is my real code) :
foo() it displays foo.
Why would PHP try to use a static…
Maxime Fabre
- 2,252
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- 24
13
votes
1 answer
Why isn't my class initialized by "def __int__" or "def _init_"? Why do I get a "takes no arguments" TypeError, or an AttributeError?
If your question was closed as a duplicate of this, it is because you had a code sample including something along the lines of either:
class Example:
def __int__(self, parameter):
self.attribute = parameter
or:
class Example:
def…
Karl Knechtel
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