dseguy, 10 months ago to php French

This is a reminder that #PHP only use int and strings as keys in array. Null is a special case here.

#phptip #phptrick

dseguy, 2 months ago to php French

I finally found an occurrence of this beauty :

$this->$this

It still looks like a typo in the original code, but with the help of #PHP __toString, it works. Also, strict_types doesn't help here.

https://php-tips.readthedocs.io/en/latest/tips/this_this.html and more tips!

#phptip #phptrick

dseguy, 7 months ago to random French

Choose your team : condition in a loop, or array_filter() first ?

Make up your mind, and then you can read this new blog post.

The result will NOT surprise you.

https://www.exakat.io/en/array_filter-versus-loop-condition-checks/

#phptip #phptrick

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

What is this piece of code will display in #PHP 8.2 ?

<?php

enum x: string {
case B = 'b';
const C = 'c';
}

class x2 {
const E = x::B->value;
const F = x::C + [];
}

echo x2::E;
?>

#phptip #phptrick

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, 4 months ago to random French

TIL file_put_contents() accepts an array as second argument, and will do an implode("", $array) on it when writing.

Who is using this feature?

#phptip #phptrick cc /@Girgias

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

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, 9 months ago (edited 9 months ago) to php French

Since #PHP 7.4, there are numeric separators, to make numbers more readable.

They are only for hard-coded literals, so what do you do if you have stored them in a string ? 😇

https://www.php.net/manual/en/language.types.integer.php#language.types.integer.syntax

#phptip #phptrick

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

#PHP Friday Heart Attack :

What does this code will display ?

#phptip #phptrick 😜

dseguy, 11 months ago to php French

#PHP allows to call any method statically, when within the same class. Here, self::foo() is a valid call (don't try this outside the same class...).

This is needed to call parent:: methods, without $this.

Question : what does $this contains in the method foo(), called statically ?
The object or null ?

#phptip #phptrick

dseguy, 4 months ago to php French

Here is a very optional #PHP command : try-catch-finally

The finally clause in a try-catch-finally is optional: it can be omitted and often is.

The catch clauses in a try-catch-finally are also optional: they can be omitted.

When the catch and finally clauses are all omitted, the try clause can also be omitted. Safely.

#phptip #phptrick

https://php-tips.readthedocs.io/en/latest/tips/try-catch-finally.html

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, 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, 2 months ago to php French

A #PHP variadic argument collects all the unused named parameters, along with their key. That way, it is possible to handle them with their name inside the method.

On the other hand, array_merge (and some cousins) refuse them, and emits a Fatal error.

#phptip #phptrick

dseguy, 7 months ago to php French

Cunning Little Switch : classic improvements to writing the old and simple switch in #PHP.

Some are errors, others are tips : all are worth keeping in mind.

#phptip #phptrick

https://www.exakat.io/en/well-structured-switch-command-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, 8 months ago to php French

TIL that #PHP has a dedicated function to calculate exp($x) - 1.

You can save quite some typing by using expm1($x);

It means exponential minus one.

#phptip #phptrick

https://3v4l.org/GCQX4

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, 4 months ago to random French

TIL that it is possible to redefine PHP functions and constants, using the 'use' command.

This is not the case for classes (or any CITE)

#phptip #phptrick

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

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, 2 months ago to php French

What is a #PHP
function which has a return type, yet doesn't return anything?

#phptip
#phptrick

dseguy, 8 months ago to php French

One of my favorite math joke is to tell people that 'Some infinites are larger than others' (Which is true, see https://cantorsparadise.com/why-some-infinities-are-larger-than-others-fc26863b872f).

At the same time, in #PHP, infinite is accessible to anyone.

#phptip #phptrick @fredbouchery

dseguy, 8 days ago to php French

#PHP question of the day : when you know that
2*2 = 4
2^2 = 4 (too)
2.5^2.5 = 9.8821176880262..

Where is this 6 coming from ?

#phptip #phptrick

dseguy, 4 months ago to php French

Useless tip of the day:

#PHP Null and booleans accept the array syntax, but always return NULL (and a warning)

Illegal types for array keys lead to a Fatal Error.

But not with NULL and booleans.

#phptip #phptrick

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