Fixed bug #76319

While at it, also make sure that mbstring case conversion takes
into account the specified substitution character and substitution
mode.

Fix unsigned comparisons

Match strpos() behavior with mbstring.func_overload

mb_strpos() specifically emulates strpos() behavior when function
overloading is enabled. However, the condition was not changed
w

Match strpos() behavior with mbstring.func_overload

mb_strpos() specifically emulates strpos() behavior when function
overloading is enabled. However, the condition was not changed
when strpos() behavior changed in PHP 7.

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year++

year++

year++

Move constants into read-only data segment

Move constants into read-only data segment

Move constants into read-only data segment

Use cheaper SEPARATE macros

Cleanup type conversion

Fix proto documents for new global functions

See NEWS and UPGRADING (or arginfo/implementation) for details.

Overlad functions once in MINIT (instead of on each requestr in RINIT)

Fix invalid read in mb_ord()

Avoid HashTable allocations for empty arrays (using zend_empty_array).

Refactor mbstring READMEs

mb_convert_variables() refactored to use simple recursion.
Fixed incorrect recursion protection (previous implementation kept protection flag or apply counter in non-zero state).

Refactored recursion pretection

Refactored array creation API. array_init() and array_init_size() are converted into macros calling zend_new_array(). They are not functions anymore and don't return any values.

Optimize mb_chr()

By avoiding an unnecessary copy between a string an zend_string.

Optimize mb_ord()

Don't perform a full encoding conversion into UCS4-BE, instead only
perform an input conversion into a wchar device.

Check for empty string in mb_ord()

Also check for invalid codepoints in mb_ord()

And return false in that case, instead of returning 0x3f...

Return false on invalid codepoint in mb_chr()

Instead of returning the encoding of the current substitution
character. This allows a robust check for the failure case. The
substituti

Return false on invalid codepoint in mb_chr()

Instead of returning the encoding of the current substitution
character. This allows a robust check for the failure case. The
substitution character (especially the default of "?") is also
a valid output of mb_chr() for a valid input (for "?" that would be
0x3f), so it's a bad choice for an error value.

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Always use Unicode codepoints in mb_ord() and mb_chr()

Previously mb_chr() had two different encoding-dependent behaviors:
* For "Unicode-encodings" it took a Unicode codepoint and retu

Always use Unicode codepoints in mb_ord() and mb_chr()

Previously mb_chr() had two different encoding-dependent behaviors:
* For "Unicode-encodings" it took a Unicode codepoint and returned
its encoded representation.
* Otherwise it returned a big-endian binary encoding of the passed
integer.

Now the input is always interpreted as a Unicode codepoint. If
a big-endian binary encoding is what you want, you don't need
mbstring to implement that.

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