Revert portions of the doc comment patch. There should be no parser
errors now.

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

Split ZEND_NAMESPACE into user and internal namespaces. Hope this is
okay with engine folks.

Multi-purpose patch:
- The fields of zend_namespace were not completely initialized which
led to a variety of problems.
- The occurrence of class/interface/namespace definition is no

Multi-purpose patch:
- The fields of zend_namespace were not completely initialized which
led to a variety of problems.
- The occurrence of class/interface/namespace definition is now
captured.
- Functions/classes/interfaces/namespaces can be preceded by doc
comments which are stored for use by extensions.

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Initial support for enforcing prototype of abstract/interface method implementations

Eliminate TSRMLS_FETCH() calls in destroy_op_array() and zend_get_class_entry().

export functions needed by cli

- Keep track of starting/ending line numbers for user functions.
- Store last parsed doc comment in a compiler global for future use.

Fix handling of ::foo

Fix parsing rules of namespaces/classes

Require abstract classes to be explicitly declared 'abstract', in order to
avoid making developers traverse the entire class/interface hierarchy
before they can figure out whether a class is

Require abstract classes to be explicitly declared 'abstract', in order to
avoid making developers traverse the entire class/interface hierarchy
before they can figure out whether a class is instantiable
(ok, so it makes sense :)

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Change opcode name

Add class type hints

Add support for interfaces

Improve infrastructure

Add infrastructure for JIT initialization of auto globals

Add 'final'

Allow namespaces to have a number of parts. I.e., now you can do:
namespace foo {
function abc() {}
}
...
namespace foo {
functio def() {}
}

Avoid using a C++ reserved word

Implement simple stream support in the ZE scanners.

ZTS fixes

Namespace patch. Big changes:
1. Nested classes are gone.
2. New syntax for namespaces:
namespace foo {
class X { ... }
function bar { ... }
var x = 1;

Namespace patch. Big changes:
1. Nested classes are gone.
2. New syntax for namespaces:
namespace foo {
class X { ... }
function bar { ... }
var x = 1;
const ZZ = 2;
}
3. Namespaced symbol access: $x = new foo::X; - etc.
For now, namespaces are case insensitive, just like classes.
Also, there can be no global class and namespace with the same name
(to avoid ambiguities in :: resolution).

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Improve parser handling of 'abstract'

Centralize class initialization

- Treat $this->foo inside class X as an implicit 'public $foo' if X::$foo
is not explicitly declared
- Forbid multiple declaration of the same variable