[WIP] Remove deprecated functionality in PHP 8

[nikic]

Work in progress removal of deprecated functionality.

From https://wiki.php.net/rfc/deprecations_php_7_2:

• __autoload (0dfd918)
• track_errors and $php_errormsg (920b4b2)
• create_function() (ee16d99)
• mbstring.func_overload (331e56c)
• (unset) (d74d392)
• parse_str() without second argument (ff780fe)
• gmp_random() (734c305)
• each() (6db97f5)
• assert() with string argument (9bc2cac)
• $errcontext argument of error handler (2f1f349)

From https://wiki.php.net/rfc/deprecations_php_7_3:

• Undocumented mbstring function aliases (83bc092)
• String search functions with integer needle (c97b9aa)
• fgetss() function and string.strip_tags filter (c7d7af8)
• Defining a free-standing assert() function (55dbb57)
• FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED flags (6b89dbc)
• pdo_odbc.db2_instance_name php.ini directive

From https://wiki.php.net/rfc/remove_php4_constructors:

• PHP 4 style constructors (371e427, 4d8dc2b, 682b54f)

From https://wiki.php.net/rfc/case_insensitive_constant_deprecation:

• Declaration of case-insensitive constants (23a5be3)
• Use of case-insensitive constants / handling of true/false/null (3d39479)

From https://wiki.php.net/rfc/deprecate_mb_ereg_replace_eval_option:

• mb_ereg_replace /e modifier (52a9325)

From https://externals.io/message/85595:

• password_hash salt parameter (94ae35c)

From https://externals.io/message/86849:

• ldap_sort (f0ddc93)

From https://wiki.php.net/rfc/deprecate-bareword-strings:

• Constant bareword fallback (aad3987)

From https://wiki.php.net/rfc/reclassify_e_strict (and followup):

• Static call to non-static method (6c73b50, e93bbf4)
• mktime() and gmmktime() without arguments (5a2787a)

From ba28d75:

• read_exif_data (c88e2cc)

[KalleZ]

Thanks Nikita, I was gonna do this once I saw your branching emails. I guess it would make sense to also add the 7.3 deprecations to this PR:
https://wiki.php.net/rfc/deprecations_php_7_3

Perhaps we should also finalize and move forward our combined RFC for 7.4?

[nikic]

Oops, I messed something up here.

[nikic]

This is close to done. Apart from some tricky constant related things, these two items are left:

• ldap_sort
• pdo_odbc.db2_instance_name

I don't want to change code that I can't build / test, so maybe @heiglandreas and @KalleZ would like to take care of those?

We still have various deprecations for things like mbstring / iconv internal_encoding handling around since PHP 5 times, but I believe the last time I tried to remove those I ran into implementation bugs, that made them non-equivalent to the new alternatives.

[KalleZ]

The pdo_odbc one I can take care off, but it won't be for another week or so, probably also the ldap_sort() as its available in the build SDK

[nikic]

This is done now from my side. Remaining is the odbc one, as well as the long-standing iconv/mbstring encoding deprecations.

[KalleZ]

@nikic I removed the pdo_odbc.db2_instance_name and I noticed the whole code block with pdo_odbc.connection_pooling. That whole code block looks pretty weird, it is missing a PHP_INI_ENTRY and was never along with pdo_odbc.db2_instance_name and just directly checks from cfg_get_string(), thoughts?