Fix null-pointer deref in if stmt printing

Fixes OSS-Fuzz #17721.

Fix bugs in AST printer

Closes GH-4324.

Fix nullable type pretty-printing

year++

year++

further sync for vim mode lines

Refactored API for constant array element propagation

Fix lineno for AST_ZVAL nodes

Fix AST start lineno for list nodes

If the node is initialized with children, check if a child has a
lower start lineno, similar to what we do for fixed-sized nodes
as well.

[ast] Fix exporting **= in expansion of assign op

(cherry picked from commit 9c3865eb6a72a6f369ba524c5a87b4896a3a9acb)

Update copyright headers to 2017

Update copyright headers to 2017

Update copyright headers to 2017

Removed IS_TYPE_IMMUTABLE (it's the same as COPYABLE & !REFCOUED)

[ast] Fix exporting **= in expansion of assign op

Allow for [] = $array; (alias for list())

Fix serializing ZEND_AST_SHELL_EXEC

Currently, `foo` is reserialized as `'foo'` due to misuse of zend_ast_export().
ZEND_AST_SHELL_EXEC can only contain ZEND_AST_ZVAL(string) or ZEND_AST

Fix serializing ZEND_AST_SHELL_EXEC

Currently, `foo` is reserialized as `'foo'` due to misuse of zend_ast_export().
ZEND_AST_SHELL_EXEC can only contain ZEND_AST_ZVAL(string) or ZEND_AST_ENCAPS_LIST,
so just handle the ZEND_AST_ZVAL(string) case directly.

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Revert "Refactor zval cleanup into single function"

This reverts commit bac6fdb0c52c924e726c5a78de8858bf27b6586b.

Refactor zval cleanup into single function

Also use zval_ptr_dtor_nogc() everywhere in Zend in favor of zval_dtor()

Fix compile warning in ast.c

Allow catching multiple exception types in a single catch statement

This commit add the possibility to catch multiple exception types in
a single catch statement to avoid code duplicatio

Allow catching multiple exception types in a single catch statement

This commit add the possibility to catch multiple exception types in
a single catch statement to avoid code duplication.

try {
// Some code...
} catch (ExceptionType1 | ExceptionType2 $e) {
// Code to handle the exception
} catch (\Exception $e) {
// ...
}

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- get rid of EG(scope). zend_get_executed_scope() should be used instead.
- ichanged zval_update_constant_ex(). Use IS_TYPE_IMMUTABLE flag on shared constants and AST, instead of "inline_change"

- get rid of EG(scope). zend_get_executed_scope() should be used instead.
- ichanged zval_update_constant_ex(). Use IS_TYPE_IMMUTABLE flag on shared constants and AST, instead of "inline_change" parameter.

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Fix constant expr coaleasce with protected mode opcache

allow null coalescing (??) on constant expressions

Fixed bug #71922