Add format attribute to a number of functions

Kill a few warnings

Replace *magic number* with a much nicer define.

Set 2147483647 as the module number of user defined constants
Fixed a few bugs and cleaned up get_defined_constants().

Fix warnings

Add missing arg info

ntroduce infrastructure for supplying information about arguments,
including:

- Whether or not to pass by ref (replaces the old arg_types, with arg_info)
- Argument name (for future

ntroduce infrastructure for supplying information about arguments,
including:

- Whether or not to pass by ref (replaces the old arg_types, with arg_info)
- Argument name (for future use, maybe introspection)
- Class/Interface name (for type hints)
- If a class/interface name is available, whether to allow a null instance

Both user and builtin functions share the same data structures.

To declare a builtin function that expects its first arg to be an instance
of class 'Person', its second argument as a regular arg, and its third by
reference, use:

ZEND_BEGIN_ARG_INFO(my_func_arg_info, 0)
ZEND_ARG_OBJ_INFO(0, someone, Person, 1)
ZEND_ARG_PASS_INFO(0)
ZEND_ARG_PASS_INFO(1)
ZEND_END_ARG_INFO();

and use my_func_arg_info as the arg_info parameter to the ZEND_FE() family
of macros.

The first arg to each ZEND_ARG_*() macro is whether or not to pass by ref.

The boolean arg to ZEND_BEGIN_ARG_INFO() tells the engine whether to treat
the arguments for which there's no explicit information as pass by reference
or not.
The boolean argument to ZEND_ARG_OBJ_INFO() (4th arg) is whether or not to allownull values.

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Fix each() binary safety for keys

fix the get_parent_class fix

Bug #24399: is_subclass_of(): fix memleak, too

Fix bug #24445

move the check down a little so it catches all cases

Fix bug #24399 from an excellent test case by edin

fix lambda function static vars (related to #17115)

updating license information in the headers.

ws

Fix set_error_handler()

rm namespace leftovers

MEGA-patch: namespaces are R.I.P.

Make use optimized string lowering

Fixed bug #23619 (set_error_handler() registered handler not called for object instances). (Jani, waboring@qualys.com)

Change get_class() so that it returns qualified names for namespaced
classes.

*HEADS UP*: get_class_name() handler interface is changed, now it should
allocate the space it returns w

Change get_class() so that it returns qualified names for namespaced
classes.

*HEADS UP*: get_class_name() handler interface is changed, now it should
allocate the space it returns with emalloc, and the users free it. If
anyone has problems with it or has suggestions how to do it without this -
please tell.

Also: make function_exists() understand namespaces.

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refine the set_error_handler fix

Fix for bug #21094 (set_error_handler can not accept methods),
by Timm Friebe

Switch some functions to use new zend_lookup_ns_class() methods. This
means that they will accept both simple and fully qualified class names.

allow class_exists() to work with namespaces too.
add CLASS_IS_NAMESPACE macro