Implement constant expression folding as a separate pass

zend_ast_dynamic_ast returns new node

AST stage 2.4

Add ability to specify additional attr in AST

Make ast->children a uint

Future optimization: only use uint for dynamic lists and use a
uchar or even an introspection function to get the child count.

AST-based compiler: Stage 1

Remove (&ast->u.child)[i] weirdness

Re-applyed Bob's patch with minor fixes

Reverted Bob's patch (it breaks many tests when run with opcache and needs to be fixed first).

Fix ZTS build

Re-added fix for bug #66015 and adapted for phpng branch

Merge mainstream 'master' branch into refactoring
During merge I had to revert:
Nikita's patch for php_splice() (it probably needs to be applyed again)
Bob Weinand's patch

Merge mainstream 'master' branch into refactoring
During merge I had to revert:
Nikita's patch for php_splice() (it probably needs to be applyed again)
Bob Weinand's patches related to constant expression handling (we need to review them carefully)
I also reverted all our attempts to support sapi/phpdbg (we didn't test it anyway)

Conflicts:
Zend/zend.h
Zend/zend_API.c
Zend/zend_ast.c
Zend/zend_compile.c
Zend/zend_compile.h
Zend/zend_constants.c
Zend/zend_exceptions.c
Zend/zend_execute.c
Zend/zend_execute.h
Zend/zend_execute_API.c
Zend/zend_hash.c
Zend/zend_highlight.c
Zend/zend_language_parser.y
Zend/zend_language_scanner.c
Zend/zend_language_scanner_defs.h
Zend/zend_variables.c
Zend/zend_vm_def.h
Zend/zend_vm_execute.h
ext/date/php_date.c
ext/dom/documenttype.c
ext/hash/hash.c
ext/iconv/iconv.c
ext/mbstring/tests/zend_multibyte-10.phpt
ext/mbstring/tests/zend_multibyte-11.phpt
ext/mbstring/tests/zend_multibyte-12.phpt
ext/mysql/php_mysql.c
ext/mysqli/mysqli.c
ext/mysqlnd/mysqlnd_reverse_api.c
ext/mysqlnd/php_mysqlnd.c
ext/opcache/ZendAccelerator.c
ext/opcache/zend_accelerator_util_funcs.c
ext/opcache/zend_persist.c
ext/opcache/zend_persist_calc.c
ext/pcre/php_pcre.c
ext/pdo/pdo_dbh.c
ext/pdo/pdo_stmt.c
ext/pdo_pgsql/pgsql_driver.c
ext/pgsql/pgsql.c
ext/reflection/php_reflection.c
ext/session/session.c
ext/spl/spl_array.c
ext/spl/spl_observer.c
ext/standard/array.c
ext/standard/basic_functions.c
ext/standard/html.c
ext/standard/mail.c
ext/standard/php_array.h
ext/standard/proc_open.c
ext/standard/streamsfuncs.c
ext/standard/user_filters.c
ext/standard/var_unserializer.c
ext/standard/var_unserializer.re
main/php_variables.c
sapi/phpdbg/phpdbg.c
sapi/phpdbg/phpdbg_bp.c
sapi/phpdbg/phpdbg_frame.c
sapi/phpdbg/phpdbg_help.c
sapi/phpdbg/phpdbg_list.c
sapi/phpdbg/phpdbg_print.c
sapi/phpdbg/phpdbg_prompt.c

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Optimized constant lookup

Merge branch 'PHP-5.6'

Fixed tests for recent constant array changes

Merge branch 'PHP-5.6'

Removed useless void* parameter and replaced with zend_bool on zval_update_constant* functions

Merge branch 'PHP-5.6'

Fixed disallowal of array usage in constants at run-time
Added at the same time the possibility of array dereferencing
to complete the set of features (useful application of arrays in constan

Fixed disallowal of array usage in constants at run-time
Added at the same time the possibility of array dereferencing
to complete the set of features (useful application of arrays in constants)

show more ...

Merge branch 'PHP-5.6'

Fix bug #66015 by reverting "Removed operations on constant arrays."

Constant duplication optimization
Argument receiving optimization

Refactored ZVAL flags usage to simplify various checks (e.g. Z_REFCOUNTED(), candidate for GC, etc)

Merge branch 'PHP-5.6'

Allow T_POW in constant expressions