#phptrick — Public Fediverse posts

#PHP quiz of the day: how can a property be both not set, empty() and failing at comparison with falsy value?

And more than one of us has this bug ATM.

#phptip #phptrick

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

New word: zombie closure

That is when you put $this in a static closure, you can run the #PHP code but you can't call it.

Just a reminder about static arrow functions.

#phptip #phptrick

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

#PHP defined() in action: there are many aspects when checking for a constant existence.

#phptip #phptrick

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

preg_split() splits #PHP strings with regexes, captures the separators and can handle an empty regex.

You don't need that everyday, but when you do, #PHP has it!

#phptip #phptrick

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

#[ReturnTypeWillChange] works on native #PHP methods and also on custom ones.

#phptrick #phptip

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

#PHP's NAN is 0 as an integer, 'NAN' as a string and not comparable with itself.

Also, there are now warning when using them, so no one can get hurt by this.

#phptip #phptrick

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

Enumerations are backed by strings, they work with in_array(), but not with array_unique()

Well, at least, not directly.

Also, did you know Enum::cases() ?

#phptip #phptrick

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

#PHP puzzle of the day: can you make Chidren::foo() call GrandParents::foo() ?

Think about it, and then, click below for the solution(s).

#phptip #phptrick

https://www.exakat.io/calling-all-ancestors/

Would it be cool to have a #PHP ::parent operator, like we have the ::class operator

Well, turns out we can.

#phptip #phptrick

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

OK, I'm tired and this #PHP make me chuckle.

#phptip #phptrick

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

Can you make this #PHP riddle running?

This compiles, so you can only add more code to make it work.

I asked 5 AI, 2 succeeded, 3 failed.

#phptip #phptrick

So, #PHP typed class constants are vaguely useful?

Here is a nice usage case that will definitely makes everyone love them.

#phptip #phptrick

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

#PHP numeric separator works well on integer, floats and also hexadecimals, octals and ... binary. And most useful in the latter, right?

0b1111_00_111_101_111

#phptip #phptrick

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

What do you think this #PHP code will write?
Could we do better ?

#phptip #phptrick

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

What if you want to convert a #PHP string to the opposite number ? Can you cast (int) and use minus?

Well, can you?

#phptip #phptrick

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

So, ...[4] means unpacking a single value from a #PHP array.
This basically means reading the value itself.

Unless it is useful sometimes...

#phptip #phptrick

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

Closure, constant, #PHP 8.5, parenthesis, ants and cast: what could go wrong, right?

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

#phptip #phptrick

TIL that it is possible to use cast, like (int) or (string) with constants, since #PHP 8.5.

#phptip #phptrick

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

The global keyword imports variables from the outside, and overwrites the local value. Beware, when using it.

#phptip #phptrick

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

Can a #PHP class have two methods with the same name?

Not with signature overloading, a classic feature, right?
But rather one method static and the other one non-static?

#phptip #phptrick

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

Do you think that intval() is a boring #PHP native function that turns string into integers?

Well, it does, but it is not boring. Far from it!

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

#phptip #phptrick

It is easy to create a map from a list of object, using #PHP array_column() and the second argument null.

That null represents the whole object, and the third argument is the indexing key.

array_column($list_of_objects, null, 'id');

#phptip #phptrick

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

It is not possible to cast any #PHP enum cases to (string) or (int) even when... they are backed!

That looks like a natural feature, though.

#phptip #phptrick

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

Dynamic class constants is achieved with #PHP 8.3 class constant syntax, and the constant() function.

It also applies to enumeration cases.

#phptip #phptrick

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

#PHP callable arrays are checked for 2 elements and only using index 0 and 1.

No one said that 0 and 1 have to be in that order, and it works perfectly!

Well done #PHP, well done!

#phptip #phptrick

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

There are, at least, 4 ways to create a closure in #PHP. They all will be callable later.

On the other hand, they behave differently to check the underlying method.

All is in the timing.

#phptip #phptrick

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

A few days ago, I warned about isset() and a possible #PHP Fatal error.

Given that isset() and ?? share the same code, it is not suprising that ?? hold the same trap.

That bug should go away, the sooner the beter.

#phptip #phptrick

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