The commits in this PR line up with the commits in PHP Core to add the functions.

Related to #809

PHP 8.0: NewFunctions: account for new fdiv() function

Added fdiv() function, which performs a floating-point division under
IEEE 754 semantics. Division by zero is considered well-defined and
will return one of Inf, -Inf or NaN.

Refs:

• https://github.com/php/php-src/blob/69888c3ff1f2301ead8e37b23ff8481d475e29d2/UPGRADING#L570-L572
• php/php-src@e35bdb4

PHP 8.0: NewFunctions: account for new get_debug_type() function

Added get_debug_type() function, which returns a type useful for error
messages. Unlike gettype(), it uses canonical type names, returns class
names for objects, and indicates the resource type for resources.
RFC: https://wiki.php.net/rfc/get_debug_type

Refs:

• https://wiki.php.net/rfc/get_debug_type
• php/php-src@ef0e447

PHP 8.0: NewFunctions: account for new get_resource_id() function

Added get_resource_id($resource) function, which returns the same value as
(int) $resource. It provides the same functionality under a clearer API.

Refs:

• https://github.com/php/php-src/blob/c0172aa2bdb9ea223c8491bdb300995b93a857a0/UPGRADING#L719-L720
• Add get_resource_id() function php/php-src#5427
• php/php-src@a0abc26

PHP 8.0: NewFunctions: account for new preg_last_error_msg() function

Added preg_last_error_msg(), which returns a human-readable message for
the last PCRE error. It complements preg_last_error(), which returns an
integer enum instead.

Refs:

• https://github.com/php/php-src/blob/69888c3ff1f2301ead8e37b23ff8481d475e29d2/UPGRADING#L556-L558
• php/php-src@aa79a22
• php/php-src@03bd433

PHP 8.0: NewFunctions: account for new str_contains() function

Added str_contains($haystack, $needle) function, which checks whether
$haystack contains $needle as a sub-string. It is equivalent to writing
strpos($haystack, $needle) !== false.

Refs:

• https://wiki.php.net/rfc/str_contains
• php/php-src@1668ad7

PHP 8.0: NewFunctions: account for str_starts_with() and str_ends_with() functions

str_starts_with() checks if a string begins with another string and returns a boolean value (true/false) whether it does.
str_ends_with() checks if a string ends with another string and returns a boolean value (true/false) whether it does.

Refs:

• https://wiki.php.net/rfc/add_str_starts_with_and_ends_with_functions
• Patch add str_starts_with and str_ends_with php/php-src#5300
• php/php-src@31fb6a0

PHP 8.0: NewFunctions: account for imagegetinterpolation() function

The function imagegetinterpolation() to get the current interpolation method
has been added.

Refs:

• https://github.com/php/php-src/blob/69888c3ff1f2301ead8e37b23ff8481d475e29d2/UPGRADING#L615-L616
• php/php-src@03bd433

PHP 8.0: NewFunctions: account for new Enchant functions

Add enchant_dict_add and enchant_dict_is_added functions

Refs:

• https://github.com/php/php-src/blob/c0172aa2bdb9ea223c8491bdb300995b93a857a0/NEWS#L73
• https://github.com/php/php-src/blob/c0172aa2bdb9ea223c8491bdb300995b93a857a0/UPGRADING#L591-L592

Includes unit test.

PHP 8.0: NewFunctions: account for new LDAP function

Added ldap_count_references(), which returns the number of reference
messages in a search result.

Refs:

• https://github.com/php/php-src/blob/c0172aa2bdb9ea223c8491bdb300995b93a857a0/UPGRADING#L723-L724
• php/php-src@915abeb

Includes unit test.