Re: [PHP-DEV] [Discussion] Variable Type Declaration Before Usage
Am 05.11.2023 um 14:37 schrieb Oladoyinbo Vincent:
Hello Internals,
Local based variable declaration before usage is available in most
languages like javascript, python, and many more. php has this, but it's
only available while working/dealing with oop related.
Somewhat ironically, one could say that typed scalar variables are
already supported,
albeit with a somewhat cumbersome syntax.
Instead of
```php
int $intVar;
```
you write
```php
class TypedInt {
public static int $intVar = 0;
}
$intVar = ::$intVar;
echo $intVar; // 0
$intVar = 3;
echo $intVar; // 3
$intVar = 'x'; // Fatal error: Uncaught TypeError
```
https://3v4l.org/GFNgp#v8.2.11
Greetings
Thomas Gutbier
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Re: [PHP-DEV] [Discussion] Variable Type Declaration Before Usage
Local based variable declaration before usage is available in most languages like javascript, python, and many more. php has this, but it's only available while working/dealing with oop related. Hello Oladoyinbo, I'll contribute an observation, correct me if I'm wrong. In Python or Javascript it is not possible to declare types, as they are dynamic languages, similar to PHP. What you can do in Python is write type annotations, but it doesn't change its type at run time. ```python myVar: int = 5; print(myVar); # The output is 5 myVar = 'Marcos'; print(myVar); # The way out is Marcos myVar = True; print(myVar); # The output is True ``` As for Javascript, it doesn't even have type annotations, you need to use `JSDoc` to document, or use `Typescript` to use types. Hug. --- Marcos Marcolin Software Engineer | PHP www.marcosmarcolin.com.br
Re: [PHP-DEV] [Discussion] Variable Type Declaration Before Usage
On Mon, Nov 6, 2023 at 3:08 AM David Gebler wrote:
>
> On Sun, Nov 5, 2023 at 1:37 PM Oladoyinbo Vincent
> wrote:
>
> > Hello Internals,
> >
> > I was wondering if php could introduce this feature or if any experienced C
> > dev here can work on the implementation of this feature.
> >
> >
> I think this is a much bigger issue than bikeshedding over syntax. The idea
> of typed variables has been discussed a few times in recent years but the
> roadblocks have been efficiency of any possible implementation, BC in
> respect of places type hinting can already be used and the overall
> usefulness / desirability of the feature. It's one of those things that's
> been filled in reasonably well by third party static analysis tools. Tbh
> I'd be more interested in an official static analyzer than more type checks
> at runtime.
It's also worth adding that many times, certain functions cannot be
chained elegantly or the nesting level gets out of hand, making
reusing variables a way to handle that:
$name = implode(' ', array_map(ucfirst(...), $name));
might be more readable to write as:
$name = array_map(ucfirst(...), $name);
$name = implode(' ', $name);
In this case, $name turns from an array to a string. Having to come up
with unique enough variable names just to satisfy type-checking would
be rather annoying (and it is in other languages).
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Re: [PHP-DEV] [Discussion] Variable Type Declaration Before Usage
On Sun, Nov 5, 2023 at 1:37 PM Oladoyinbo Vincent wrote: > Hello Internals, > > I was wondering if php could introduce this feature or if any experienced C > dev here can work on the implementation of this feature. > > I think this is a much bigger issue than bikeshedding over syntax. The idea of typed variables has been discussed a few times in recent years but the roadblocks have been efficiency of any possible implementation, BC in respect of places type hinting can already be used and the overall usefulness / desirability of the feature. It's one of those things that's been filled in reasonably well by third party static analysis tools. Tbh I'd be more interested in an official static analyzer than more type checks at runtime.
