Add support for union types in stubs

This is the MVP for supporting union types in PHP stubs. Return
types with only builtin types work, which is the part we mainly
need.

Cl

Add support for union types in stubs

This is the MVP for supporting union types in PHP stubs. Return
types with only builtin types work, which is the part we mainly
need.

Closes GH-4895.

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Add stubs for standard lib functions

Fix consistency issues with array accesses warnings/exceptions

* Change a number of "resource used as offset" notices to warnings,
which were previously missed.
* Throw the "res

Fix consistency issues with array accesses warnings/exceptions

* Change a number of "resource used as offset" notices to warnings,
which were previously missed.
* Throw the "resource used as offset" warning for isset() as well.
* Make array_key_exists() behavior with regard to different key
types consistent with isset() and normal array accesses. All key
types now use the usual coercions and array/object keys throw
TypeError.

Closes GH-4887.

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Warn on strtr(["" => "x"])

Previously:
* If only ["" => "x"] was present, the original string was returned
without warning.
* If both ["" => "x"] and at least one more eleme

Warn on strtr(["" => "x"])

Previously:
* If only ["" => "x"] was present, the original string was returned
without warning.
* If both ["" => "x"] and at least one more element was present,
false was returned without warning.

New behavior:
* Ignore "" keys in the replacement array (and perform any remaining
replacement).
* Throw a warning indicating that an empty string replacement has
been ignored.

Closes GH-4792.

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Promote mt_rand() min/max warning to ValueError

Add stubs for various standard functions

Closes GH-4851.

Add stubs for directory and file functions

Allow array_splice() length to be null

Accept null lengths for substr functions()

If a null $length is passed to any of these functions, behave as if no
parameter was passed:

- substr()
- substr_count()
-

Accept null lengths for substr functions()

If a null $length is passed to any of these functions, behave as if no
parameter was passed:

- substr()
- substr_count()
- substr_compare()
- iconv_substr()

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Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime constructor also accepts zero arguments
* hash_update_file() stream context is optional
* xmlwriter_write_dtd_entity() $isparam argument is optional

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Convert string function arginfo to PHP stubs

Fix array_fill stub return type

This was missed in commit d5e9ef8f0fad00618de62949d362d0980c6250f9.

Promote warnings to errors in array_push()

This is in line with the engine change from
https://wiki.php.net/rfc/engine_warnings.

Promote warnings to errors in extract()

Add assert arginfo stubs

Closes GH-4619.

Make sure that params with null default are marked nullable

Assert that symbol table is available in compact()

I believe NULL here is no longer possible due to the dynamic call
check. A similar assumption already exists in the extract()
imple

Assert that symbol table is available in compact()

I believe NULL here is no longer possible due to the dynamic call
check. A similar assumption already exists in the extract()
implementation.

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Promote warnings to errors in array_rand()

Convert remaining array function arginfo to PHP stubs

Add some header and html function stub

Add sha1 arginfo stubs

Add pageinfo arginfo stubs

Add metaphone arginfo stubs

Add md5 arginfo stubs

Add lcg arginfo stubs