PHP 8.1 deprecation of null arguments

[Deathamns]

With the recent v5.0.0RC1 and PHP 8.1 I'm seeing entries in my log files about passing null parameters to built-in functions.

For example calling Phalcon\Http\Request\getLanguages() when the HTTP_ACCEPT_LANGUAGE header is not present, I get messages such as:
preg_split(): Passing null to parameter #2 ($subject) of type string is deprecated

cphalcon/phalcon/Http/Request.zep

Line 1404 in b6e8688

this->getServer(serverIndex),

These deprecation messages might surface in other places as well, I've only noticed this specific case.

Passing null to non-nullable parameters of built-in functions
PHP 8.1 : Passing null to non-nullable arguments of internal functions is deprecated

[niden]

We definitely need to address these. I will try and get as much reporting as possible from our testing suite but that might not cover a lot of areas that could be problematic.

Anything else you see @Deathamns please report it. I am going to address this one shortly.

[niden]

Resolved in #15985

Thank you @Deathamns

[Jeckerson]

Released in v5.0.0RC2

[dz3n]

@niden
Deprecated: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in

Same issue if you using StringLength validator with nullable column

[niden]

Resolved in #15995

@dz3n Thank you for reporting this!

[Deathamns]

cphalcon/phalcon/Mvc/View/Engine/Volt.zep

Lines 191 to 202 in b6e8688

	public function length(var item) -> int
	{
	if typeof item == "object" || typeof item == "array" {
	return count(item);
	}
	if function_exists("mb_strlen") {
	return mb_strlen(item);
	}
	return strlen(item);
	}

[niden]

Resolved in #16004