Allow 'h' and 'k' flags to be combined for mb_convert_kana

The 'h' flag makes mb_convert_kana convert zenkaku hiragana to hankaku
katakana; 'k' makes it convert zenkaku katakana to hanka

Allow 'h' and 'k' flags to be combined for mb_convert_kana

The 'h' flag makes mb_convert_kana convert zenkaku hiragana to hankaku
katakana; 'k' makes it convert zenkaku katakana to hankaku katakana.

When working on the implementation of mb_convert_kana, I added some
additional checks to catch combinations of flags which do not make
sense; but there is no conflict between 'h' and 'k' (they control
conversions for two disjoint ranges of codepoints) and this combination
should not have been restricted.

Thanks to the GitHub user 'akira345' for reporting this problem.

Closes GH-10174.

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New implementation of mb_convert_kana

mb_convert_kana now uses the new text encoding conversion
filters. Microbenchmarking shows speed gains of 50%-150%
across various text encodings

New implementation of mb_convert_kana

mb_convert_kana now uses the new text encoding conversion
filters. Microbenchmarking shows speed gains of 50%-150%
across various text encodings and input string lengths.

The behavior is the same as the old mb_convert_kana
except for one fix: if the 'zero codepoint' U+0000 appeared
in the input, the old implementation would sometimes drop
it, not passing it through to the output. This is now
fixed.

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Strict validation of conversion flags to mb_convert_kana

mb_convert_kana is controlled by user-provided flags, which specify what it should convert
and to what. These flags come in inver

Strict validation of conversion flags to mb_convert_kana

mb_convert_kana is controlled by user-provided flags, which specify what it should convert
and to what. These flags come in inverse pairs, for example "fullwidth numerals to halfwidth
numerals" and "halfwidth numerals to fullwidth numerals". It does not make sense to combine
inverse flags.

But, clever reader of commit logs, you will surely say: What if I want all my halfwidth
numerals to become fullwidth, and all my fullwidth numerals to become halfwidth? Much too
clever, you are! Let's put aside the fact that this bizarre switch-up is ridiculous and
will never be used, and face up to another stark reality: mb_convert_kana does not work
for that case, and never has. This was probably never noticed because nobody ever tried.

Disallowing useless combinations of flags gives freedom to rearrange the kana conversion
code without changing behavior.

We can also reject unrecognized flags. This may help users to catch bugs.

Interestingly, the existing tests used a 'Z' flag, which is useless (it's not recognized
at all).

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Add more tests for mb_convert_kana

Remove unnecessary mbstring skipifs

These functions are always available (if the extension is available
at all).

Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in al

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in all
*.phpt sections.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in al

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in all
*.phpt sections.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

show more ...

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in al

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in all
*.phpt sections.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

show more ...

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in al

Sync leading and final newlines in *.phpt sections

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines in all
*.phpt sections.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

show more ...

- MFH: New tests (WurzbrugUG testfest)