Deprecate mb_ereg_replace with non-string pattern

I'm counting this towards the non-string needle deprecation from
https://wiki.php.net/rfc/deprecations_php_7_3. I wasn't aware that

Deprecate mb_ereg_replace with non-string pattern

I'm counting this towards the non-string needle deprecation from
https://wiki.php.net/rfc/deprecations_php_7_3. I wasn't aware that
mb_ereg_replace() is also affected by this issue. It's even more
ridiculous than usual here, because the integer is interpreted as
an ASCII codepoint, even though these are supposed to be multibyte
functions :(

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Remove bareword fallback for constants

Access to undefined constants will now always result in an Error
exception being thrown.

This required quite a few test changes, because t

Remove bareword fallback for constants

Access to undefined constants will now always result in an Error
exception being thrown.

This required quite a few test changes, because there were many
buggy tests that unintentionally used bareword fallback in combination
with error suppression.

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Revert "Don't silence fatal errors with @"

This reverts commit abd36289e26cc0365e82373699aba4c1ffff464d.

This wasn't ready for merging yet, there are still some test
failures.

Don't silence fatal errors with @

Remove -1 crop mode

Remove intl Normalizer::NONE

Remove support for __autoload()

There are probably some improvements we can do to the SPL
implementation now that __autoload() is gone. In particular having
EG(autoload_func) as a pr

Remove support for __autoload()

There are probably some improvements we can do to the SPL
implementation now that __autoload() is gone. In particular having
EG(autoload_func) as a property zend function, rather than a simple
callback probably doesn't make sense.

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Removed read_exif_data() alias

Require at least one arg for mktime/gmmktime

Remove ability to specify 'salt' in password_hash()

Remove static calls to non-static methods

Forbid unbinding $this from methods

Remove ability to declare userland case-insensitive constants

This is part of https://wiki.php.net/rfc/case_insensitive_constant_deprecation.

This commit only removes the ability to

Remove ability to declare userland case-insensitive constants

This is part of https://wiki.php.net/rfc/case_insensitive_constant_deprecation.

This commit only removes the ability to declare such constants from
userland. Before the functionality can be removed entirely, it's
necessary to figure out the handling of true/false/null first.

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Remove 'e' modifier for mb_ereg_replace()

This was deprecated in PHP 7.1 through
https://wiki.php.net/rfc/deprecate_mb_ereg_replace_eval_option.

Remove support for legacy constructors

This has been deprecated in PHP 7.0 by
https://wiki.php.net/rfc/remove_php4_constructors.

Remove FILTER_FLAG_(SCHEME|HOST)_REQUIRED

Deprecated in PHP 7.3 as part of
https://wiki.php.net/rfc/deprecations_php_7_3.

Remove (unset) cast

Deprecated in PHP 7.2 as part of
https://wiki.php.net/rfc/deprecations_php_7_2.

Always treat needles as strings

This is part of https://wiki.php.net/rfc/deprecations_php_7_3.

Remove fgetss and friends

These were deprecated in PHP 7.3 as part of
https://wiki.php.net/rfc/deprecations_php_7_3.

Remove deprecated mbregex aliases

These have been deprecated in PHP 7.3 as part of
https://wiki.php.net/rfc/deprecations_php_7_3.

Remove each()

This has been deprecated in PHP 7.2 as part of
https://wiki.php.net/rfc/deprecations_php_7_2.

Remove special treatment of strings in asserts

This was deprecated in PHP 7.2 as part of
https://wiki.php.net/rfc/deprecations_php_7_2.

Add UPGRADING entries for removed functionality

Remove deprecated INTL_IDNA_VARIANT_2003

Cf. <https://wiki.php.net/rfc/deprecate-and-remove-intl_idna_variant_2003>

Remove deprecated png2wbmp() and jpeg2wbmp()

Cf. <https://wiki.php.net/rfc/deprecate-png-jpeg-2wbmp>