Fix default value of $flags in idn_to_ascii() and idn_to_utf8()

Declare a few missing function return types

Closes GH-7395

Backport some intl stub changes from master

While we're not sure under what circumstances they would fail,
they're fallible on the implementation level.

Add missing classes to stubs

Make NumberFormatter ctor $pattern nullable

Whether the pattern is needed depends on the used style. If no
pattern is needed, null is a more sensible value than an empty
string.

Make NumberFormatter ctor $pattern nullable

Whether the pattern is needed depends on the used style. If no
pattern is needed, null is a more sensible value than an empty
string.

fixup

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Make IntlDateFormatter ctor $pattern nullable

The implementation already made this argument nullable, but it
was not reflected in the stub.

Verify parameter names of function aliases

Closes GH-6335

Improve parameter names in ext/intl

Closes GH-6309

More precise type information for datefmt_format()

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary traili

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary trailing backslashes, and settles on using ? when possible for nullable types.

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Declare array|int and object-of-class|int types in stubs

Closes GH-6081

Co-Authored-By: Nikita Popov <nikic@php.net>

Use ZPP instead of custom type checks

We can add these types as a native type declaration to stubs as a side-effect. Closes GH-6068

Add more precise type info for stubs

Closes GH-6005

Add another round of missing parameter types to stubs

Closes GH-5950

Add a bunch of missing argument types to stubs

Warning to ValueError promotion in Intl extension Part 1

Affects:
- IntlCalendar
- IntlGregorianCalendar
- IntlBreakIterator

Closes GH-5669

Add a few missing parameter types in stubs

Related to GH-5627

Fix IntlGregorianCalendar constructor signature

Give these conversative UNKNOWN defaults and no types, as the
overload is something of a mess.

Fix some UNKNOWN default values

In ext/ffi, ext/intl, ext/mysqli, and ext/pcntl

Generate method entries for ext/intl

Closes GH-5370

Fix the default value of the $length parameter of grapheme_substr()

Do not include the same stub multiple times

Closes GH-5322