[php] PHP 8 compatibility

[RealyUniqueName]

• - new \Socket and \AddressInfo classes instead of related resource types (details). This creates a conflict between extern definitions for PHP7 & PHP8
• attributes
• various situations of int<->float coercion is deprecated and generate E_DEPRECATED notice

[cedx]

Another important issue with PHP 8: Haxe allows required parameters to be after optional ones. So this:

public function new(method:Method, url:Url, protocol:Protocol = HTTP1_1, fields)

Is compiled to that:

public function __construct ($method, $url, $protocol = null, $fields)

And it raises the following exception:

Uncaught ErrorException: Required parameter $fields follows optional parameter $protocol

More info: https://php.watch/versions/8.0/deprecate-required-param-after-optional

@RealyUniqueName How can we customize the error handler? Setting error_reporting = E_ALL & ~E_DEPRECATED in php.ini doesn't avoid the ErrorException.

[RealyUniqueName]

Another important issue with PHP 8: Haxe allows required parameters to be after optional ones.

This is already fixed in development and 4.1_bugfix branches.

Error reporting is forced here:

haxe/std/php/Boot.hx

Line 62 in 6d3fef0

var previousLevel = Global.error_reporting(Const.E_ALL);

You can redefine it in static function main or in the static function __init__ of your main class.

[cedx]

This is already fixed in development and 4.1_bugfix branches.

@RealyUniqueName Thanks for all your efforts!