dseguy, 5 months ago to php French

TIL you can get the following #PHP error message :

"Cannot add element to the array as the next element is already occupied"

How?

#phptip #phptrick

dseguy, 5 months ago (edited 5 months ago) to php French

#PHP Quizz question :

Can you write a #PHP function that won't execute when you call it?

(Just change the comment // more code )

#phptip #phptrick

dseguy, 5 months ago to php French

TIL that the #PHP cast operators such as (int), (array)... are case insensitive: (STRING)

Also, the amount of white space (space, tabs...) is not important.

The rest is coding convention, as they say.

#phptip #phptrick

dseguy, 5 months ago to php French

When refactoring arrays into object, you can count on #PHP 's dynamic syntax to keep all your code working while replacing Plain Old Arrays by classes.

Learn how to harness PHP dual syntax array-objects!

#phptip #phptrick

https://www.exakat.io/en/smooth-migration-from-array-to-object/

dseguy, 5 months ago to php French

I noticed only recently that array syntax on object are Fatal, while object syntax on array are only a Warning and a NULL.

This looks like backward incompatibility. May be #PHP could introduce a directive to level both errors?

#phptip #phptrick

https://php-tips.readthedocs.io/en/latest/index.html

dseguy, 5 months ago to php French

😂 This made me chuckle... welcome to #PHP 8.3 !

First array is the type, the second is the name of the constant, with the relaxed keyword, and the last one is the value of the array.

#phptip #phptrick

dseguy, 5 months ago to php French

Class invasion, it when an object access anything it wants in another object of the same class. Thanks to the way #PHP checks each object's perimeter.

The same checks allow the other object to access the current one's, as seen in that example.

https://3v4l.org/9XWmu

https://php-dictionary.readthedocs.io/en/latest/dictionary.html#class-invasion

#phptip #phptrick

dseguy, 6 months ago to php French

Comparison of memory usage and execution speed between #PHP associative arrays, named and anonymous classes, stdClasses and extended classes, across PHP versions.

TLDR; using classes is more memory efficient, and a bit faster.

#phptip #phptrick

https://www.exakat.io/en/array-classes-and-anonymous-memory-usage/

dseguy, 6 months ago to php French

I think I expected $a (the second print_r) to show an array, but -3 is indeed more logical.

I also expected the static $x to be [-3], thanks to the reference, but it isn't.

Weird night coding.

https://3v4l.org/guEKP

What do you think ?

#phptip #phptrick #PHP

dseguy, 6 months ago (edited 6 months ago) to php French

In the list below, there is one #PHP fatal error. All others are working as expected, except for the fact that they probably should yield an error and be not legit.

The error says : "Cannot use [] for reading".

Did you guess the one?

#phptip #phptrick

dseguy, 6 months ago (edited 6 months ago) to php French

I'm still struggling to pick a #PHP side.

@ is too slow, because it merely hides the error.

?? looks dumb: it reads : if it is null, use null as default.

the if() command is long to type.

#phptip #phptrick

dseguy, 6 months ago to random French

To make a class alias, use class_alias();
To make an interface alias, use class_alias();
To make an enum alias, use class_alias();
To make a trait alias, use class_alias();

Also, no ::enum operator, ::trait operator?

#phptip #phptrick

dseguy, 6 months ago (edited 6 months ago) to random French

Untyped properties and properties typed as mixed are not compatibles one another.

Although, they represent the same typing : anything.

Same for return type, in method compatibility situations. Although, it happens only when the parent is mixed, and the child untyped.

https://3v4l.org/HkW9J

#phptip #phptrick

dseguy, 6 months ago to random French

Could you improve an expression such as '$a == 'a' || $a == 'A'' ?

I collected 12 variations of that challenge.

in_array() is the surprising winner of that race, with strcasecmp() and isset() in tow. || (or) is not far and a good solution in any case.

#phptip #phptrick

https://www.exakat.io/en/unraveling-the-quest-for-the-fastest-case-insensitive-char-comparison-in-php/

dseguy, 6 months ago to php French

#PHP yield keyword allows anything as key, and that is transmitted to the calling foreach() command. So, you can have arrays or closures as keys, or worse.

Just a weird use case for tonight.

#phptip #phptrick

https://3v4l.org/o8jBb

dseguy, 6 months ago to random French

Static is used to mark a property as 'static',
and as a type for that property.

Leading to those confusing lines below.

Static would accept self, but also parent and any children class: so, self is sufficient and there is no syntax for for 'static static'

https://3v4l.org/ffPcv

#phptip #phptrick

dseguy, 6 months ago to php French

The #PHP (array) operator is a simple cast to array. Yet, it is one of the less obvious feature of the language : (array) on integers, on null, on objects, recursive and hidden.

That's a lot to discover for the oldest and most useful operator.

#phptip #phptrick

https://www.exakat.io/en/mastering-the-array-cast-operator-in-php-a-comprehensive-guide/

dseguy, 6 months ago to php French

I know there is no such a function as empty(), as it is a language construct.

#PHP 8.0 brought an improvement to this, as this is now a Fatal Error, rather than a Parse Error.

But, that aside, come on...

#phptip #phptrick

https://3v4l.org/ML6cX

dseguy, 7 months ago (edited 7 months ago) to php French

It is possible to put 2 elements in a #PHP array, find different 5 keys with array_key_exists or isset) and yet, still count 2 distinct elements (key wise).

The type-juggling for array keys is applied in every #PHP features, to keep things easy to use.

This code is one rare way to show how it still leaks. Depending on the context, it might be very confusing.

#phptip #phptrick

https://3v4l.org/hYsN9

dseguy, 7 months ago to php French

Here is another way to make recursive calls in #PHP : use the generator delegation.

The main difference is that it needs to be in a foreach() or a generator using function.

https://3v4l.org/2FDXY

#phptip #phptrick

dseguy, 7 months ago to php French

So, you have a variable with the name of something (a class, a method, arguments, etc) and you want to call it?

#PHP has your back. You can call about anything. There's always a syntax for a dynamic call.

#phptip #phptrick

https://www.exakat.io/en/all-the-dynamic-syntaxes-in-php/

dseguy, 7 months ago (edited 7 months ago) to php French

I think I found a 'void' parameter in #PHP. It is the second argument of array_keys().

That second parameter is often omitted (and unknown).

If present, it is typed 'mixed' to allow any value to be searched (here, null).

If absent, array_keys() returns ALL keys. When absent, it is not null, nor any other type. The last one possible is 'void'

Type is then : void|mixed.
Does that make sense or am I over-thinking this?

https://3v4l.org/VVDRW

#phptip #phptrick

dseguy, 7 months ago to php French

A quick review of what has changed in switch() with #PHP 8.

switch() is impacted by the integer / string comparison evolution, and also by special tricks with null. All these are detailled in this article. Lots of #phptip #phptrick

https://exakat.io/en/php-8-changes-in-switch/

dseguy, 7 months ago (edited 7 months ago) to php French

One of the two #PHP var_dump() here is not the same.

Unsetting properties is a always a bad code smell.

#phptip #phptrick