Remove warning upon division by zero

Cleanup (avoid reallocatios and side effects in php_strip_tags)

Use ZSTR_ API to access zend_string elements (this is just renaming without semantick changes).

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>
Date: Fri Jun 26 01:23:31 2015 +0200

Use the new 'ZSTR' macros in the rest of the code.

Does not change anything to the generated code (thanks to compat macros) but cleaner.

commit b3526439104ac7a89a8e0c79dbebf33b22bd01b8
Author: Francois Laupretre <francois@tekwire.net>
Date: Thu Jun 25 13:45:06 2015 +0200

Improve zend_string API

Add missing methods

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Reverted wrong fb08798c9f0ea820d567668d0cea4833dc61dd8e

Fix bug #69957 (Different ways of handling div/mod by zero)

Drop duplicate object-to-type notices

We already generate a recoverable fatal for these earlier, no need
to throw an additional notice.

Fixed crash in Zend/tests/bug69891.phpt on x86 (32-bit).
compare_function() now has to be compatible with binary_op_type (use fastcall convention).
Introduced new zval_compare_function() to b

Fixed crash in Zend/tests/bug69891.phpt on x86 (32-bit).
compare_function() now has to be compatible with binary_op_type (use fastcall convention).
Introduced new zval_compare_function() to be used as zval comparison callback instead of compare_function().

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Use COW to prevent unnecessary duplication of dynamic propertyes of stdClass (and other classes without predefined properties).

Support references in convert_to_*

conver_to_* functions now accept REFERENCE values, which will be
unwrapped before performing the usual conversion. This is consistent
with convert_

Support references in convert_to_*

conver_to_* functions now accept REFERENCE values, which will be
unwrapped before performing the usual conversion. This is consistent
with convert_scalar_to_number and matches the expected behavior in
a couple random use-sites I checked.

Also includes a couple fixes/cleanups elsewhere and two tests for
cases that previously didn't work (though the reference issue existed
all over the place).

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Fix references handling in convert_scalar_to_number

Make convert_to_* safe with rc>1

This only involves switching zval_dtor to zval_ptr_dtor for arrays
and making the convert_to_object for arrays a bit more generic.

All the other

Make convert_to_* safe with rc>1

This only involves switching zval_dtor to zval_ptr_dtor for arrays
and making the convert_to_object for arrays a bit more generic.

All the other changes outside zend_operators.c just make use of
this new ability (use COPY instead of DUP).

What's still missing: Proper references handling. I've seen many
convert_to* calls that will break when a reference is used.

Also fixes bug #69788.

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fix bitwise object operations

Use CG(one_char_string) if possible in bitwise string operations

emalloc() is not cheap... Also, a good part of bitwise string ops out there are on single bytes.

Fix bug #69403 and other int overflows

Inline IS_LONG value calculation and avoid strtol() call.

Improve fast_is_[not_]identical() functions to teturn value instead of takeing additional arguments.
Pair INSTANCEOF with the following JMPZ/JMPNZ.

Undef results for new arithmetic exceptions

For the compound assing case (e.g. $a <<= $b) the result is going
to be dtored, so we have to set *some* value.

0.0 / 0.0 = NaN

fix build

Fixed weird operators behavior. Division by zero now emits warning and returns +/-INF, modulo by zero and intdid() throws an exception, shifts by negative offset throw exceptions. Compile-time evalua

Fixed weird operators behavior. Division by zero now emits warning and returns +/-INF, modulo by zero and intdid() throws an exception, shifts by negative offset throw exceptions. Compile-time evaluation of division by zero is disabled.

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Fixed performance degradation introduced with lateast EnfineException related changes.
Restore original errors order in executor.

Convert fatal errors into EngineExceptions

Convert fatal errors into EngineExceptions

Convert "Unsupported operands" fatal error into EngineException (exceptions can't be thrown at compile-time yet, so unsuported operands in constant expressions are still lead to fatal error).