Allow to use yield without value

If the generator is used as a coroutine it often doesn't make sense to yield
anything. In this case one can simply receive values using

$val

Allow to use yield without value

If the generator is used as a coroutine it often doesn't make sense to yield
anything. In this case one can simply receive values using

$value = yield;

The yield here will simply yield NULL.

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Add support for $generator->send()

Yield now is an expression and the return value is the value passed to
$generator->send(). By default (i.e. if ->next() is called) the value is
NUL

Add support for $generator->send()

Yield now is an expression and the return value is the value passed to
$generator->send(). By default (i.e. if ->next() is called) the value is
NULL.

Unlike in Python ->send() can be run without priming the generator with a
->next() call first.

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Add zend_do_suspend_if_generator calls

The execution of generator functions will be suspended right after the
arguments were RECVed. This will be done in zend_do_suspend_if_generator.

Add flag for generator functions

Generator functions have to specify the * (asterix) modifier after the
function keyword. If they do so the ZEND_ACC_GENERATOR flag is added to
the fn

Add flag for generator functions

Generator functions have to specify the * (asterix) modifier after the
function keyword. If they do so the ZEND_ACC_GENERATOR flag is added to
the fn_flags.

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Add T_YIELD "yield" keyword

Allow arbitrary expressions for empty()

This change is as per RFC https://wiki.php.net/rfc/empty_isset_exprs.

The change allows passing the result of function calls and other
ex

Allow arbitrary expressions for empty()

This change is as per RFC https://wiki.php.net/rfc/empty_isset_exprs.

The change allows passing the result of function calls and other
expressions to the empty() language construct. This is accomplished by
simply rewriting empty(expr) to !expr.

The change does not affect the suppression of errors when using empty()
on variables. empty($undefinedVar) will continue not to throw errors.
When an expression is used inside empty() on the other hand, errors will
not be suppressed. Thus empty($undefinedVar + $somethingElse) *will*
throw a notice.

The change also does not make empty() into a real function, so using
'empty' as a callback is still not possible.

In addition to the empty() changes the commit adds nicer error messages
when isset() is used on function call results or other expressions.

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Implement const array/string dereference

RFC:https://wiki.php.net/rfc/constdereference

Fix lexing of nested heredoc strings in token_get_all()

This fixes bug #60097.

Before two global variables CG(heredoc) and CG(heredoc_len) were used to
track the current heredoc

Fix lexing of nested heredoc strings in token_get_all()

This fixes bug #60097.

Before two global variables CG(heredoc) and CG(heredoc_len) were used to
track the current heredoc label. In order to support nested heredoc
strings the *previous* heredoc label was assigned as the token value of
T_START_HEREDOC and the language_parser.y assigned that to CG(heredoc).

This created a dependency of the lexer on the parser. Thus the
token_get_all() function, which accesses the lexer directly without
also running the parser, was not able to tokenize nested heredoc strings
(and leaked memory). Same applies for the source-code highlighting
functions.

The new approach is to maintain a heredoc_label_stack in the lexer, which
contains all active heredoc labels.

As it is no longer required, T_START_HEREDOC and T_END_HEREDOC now don't
carry a token value anymore.

In order to make the work with zend_ptr_stack in this context more
convenient I added a new function zend_ptr_stack_top(), which retrieves the
top element of the stack (similar to zend_stack_top()).

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Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants i

Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants in methods defined in traits are delayed till run-time. This approach also made possible to use __CLASS__ constant as default value for traits properties and method arguments.

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Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants i

Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants in methods defined in traits are delayed till run-time. This approach also made possible to use __CLASS__ constant as default value for traits properties and method arguments.

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- Year++

- Year++

- Year++

- Added class member access on instantiation (e.g. (new foo)->bar()) support

- Added class member access on instantiation (e.g. (new foo)->bar()) support

- Drop T_SCALAR_CAST

- Drop T_SCALAR_CAST

Callable typehint following the rules of is_callable($arg, false);

Callable typehint following the rules of is_callable($arg, false);

Added support for Class::{expr}() syntax (Pierrick)

Added support for Class::{expr}() syntax (Pierrick)

Added __TRAIT__ magic constant [TRAITS] [DOC]
# __TRAIT__ behaves like __CLASS__ more or less but is constraint to traits.
# Since traits are not types, there are not many valid use cases, an

Added __TRAIT__ magic constant [TRAITS] [DOC]
# __TRAIT__ behaves like __CLASS__ more or less but is constraint to traits.
# Since traits are not types, there are not many valid use cases, and trying
# to use __TRAIT__ to make traits more like classes is discouraged.

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Added __TRAIT__ magic constant [TRAITS] [DOC]
# __TRAIT__ behaves like __CLASS__ more or less but is constraint to traits.
# Since traits are not types, there are not many valid use cases, an

Added __TRAIT__ magic constant [TRAITS] [DOC]
# __TRAIT__ behaves like __CLASS__ more or less but is constraint to traits.
# Since traits are not types, there are not many valid use cases, and trying
# to use __TRAIT__ to make traits more like classes is discouraged.

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- add short array syntax as defined in https://wiki.php.net/rfc/shortsyntaxforarrays, 2nd solution using => only

- add short array syntax as defined in https://wiki.php.net/rfc/shortsyntaxforarrays, 2nd solution using => only