Re: [patch] Dynamic access of static members/methods, and constants

Hi, In this way, classes can be considered as polymorphism, just like objects. So is it OK to allow abstract static function in abstract class to support this feature directory? Currently it is forbidden in HEAD, only interfaces can have static function. Thanks 2007/4/27, Etienne Kneuss <colder@php.net>:

Hi, I've already proposed that 1-2 months ago, but now seems to be a good time to discuss new things, so let's try again: I believe it would be nice to be able to dynamically reference static members, constants, and methods. Currently, there is no way to do that and the only way would be to create a static method and use call_user_func(array($classname, 'getThat')); In other words: class A {

     public static $foo = 'value1';
     const  gee = 'value2';
     public static function bar() { return 'value3'; }

     // old way:
     public static function getFoo() { return self::$foo; }
     public static function getGee() { return self::gee; }

} $classname = 'A'; echo $classname::$foo; // value1 echo $classname::gee; // value2 echo $classname::bar(); // value3 // --- instead of: --- $classname = 'A'; echo call_user_func(array($classname, 'getFoo')); // value1 echo call_user_func(array($classname, 'getGee')); // value2

echo call_user_func(array($classname, 'bar'));    // value3

which is quite slow. Please take a look at the patch[1] I made for it. Comments would be appreciated! Regards, 1: http://patches.colder.ch/Zend/dynamic-static-calls.patch?markup -- Etienne Kneuss http://www.colder.ch colder@php.net Men never do evil so completely and cheerfully as when they do it from a religious conviction. -- Pascal Index: Zend/zend_language_parser.y =================================================================== RCS file: /repository/ZendEngine2/zend_language_parser.y,v retrieving revision 1.179 diff -u -r1.179 zend_language_parser.y

--- Zend/zend_language_parser.y 4 Mar 2007 16:25:57 -0000       1.179

+++ Zend/zend_language_parser.y 6 Mar 2007 14:43:49 -0000 @@ -642,6 +642,12 @@

        |       fully_qualified_class_name T_PAAMAYIM_NEKUDOTAYIM

variable_without_objects '(' { zend_do_end_variable_parse(BP_VAR_R, 0 TSRMLS_CC); zend_do_begin_class_member_function_call(&$1, &$3 TSRMLS_CC); }

                        function_call_parameter_list
                        ')' { zend_do_end_function_call(NULL, &$$, &$6, 1,

1 TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);}

+       |       variable_class_name T_PAAMAYIM_NEKUDOTAYIM T_STRING '(' {

zend_do_begin_class_member_function_call(&$1, &$3 TSRMLS_CC); }

+                       function_call_parameter_list
+                       ')' { zend_do_end_function_call(NULL, &$$, &$6, 1,

1 TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);}

+       |       variable_class_name T_PAAMAYIM_NEKUDOTAYIM

variable_without_objects '(' { zend_do_end_variable_parse(BP_VAR_R, 0 TSRMLS_CC); zend_do_begin_class_member_function_call(&$1, &$3 TSRMLS_CC); }

+                       function_call_parameter_list
+                       ')' { zend_do_end_function_call(NULL, &$$, &$6, 1,

1 TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);}

        |       variable_without_objects  '(' {

zend_do_end_variable_parse(BP_VAR_R, 0 TSRMLS_CC); zend_do_begin_dynamic_function_call(&$1 TSRMLS_CC); }

                        function_call_parameter_list ')'
                        { zend_do_end_function_call(&$1, &$$, &$4, 0, 1

TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);} @@ -795,6 +801,11 @@ static_member:

                fully_qualified_class_name T_PAAMAYIM_NEKUDOTAYIM

variable_without_objects { $$ = $3; zend_do_fetch_static_member(&$$, &$1 TSRMLS_CC); }

+        | variable_class_name T_PAAMAYIM_NEKUDOTAYIM

variable_without_objects { $$ = $3; zend_do_fetch_static_member(&$$, &$1 TSRMLS_CC); } +; + +variable_class_name:

+     reference_variable { zend_do_end_variable_parse(BP_VAR_R, 0

TSRMLS_CC); zend_do_fetch_class(&$$, &$1 TSRMLS_CC); } ; @@ -930,6 +941,7 @@ class_constant:

                fully_qualified_class_name T_PAAMAYIM_NEKUDOTAYIM T_STRING

{ zend_do_fetch_constant(&$$, &$1, &$3, ZEND_RT TSRMLS_CC); }

+               | variable_class_name T_PAAMAYIM_NEKUDOTAYIM T_STRING {

zend_do_fetch_constant(&$$, &$1, &$3, ZEND_RT TSRMLS_CC); } ; %% Index: tests/lang/041.phpt =================================================================== RCS file: tests/lang/041.phpt diff -N tests/lang/041.phpt --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ tests/lang/041.phpt 6 Mar 2007 14:43:49 -0000 @@ -0,0 +1,14 @@ +--TEST-- +Dynamic access of static members +--FILE-- +<?php +class A {

+    public    static $b = 'foo';

+} +$classname = 'A'; +echo $classname::$b; +?> +===DONE=== +--EXPECT-- +foo +===DONE=== Index: tests/lang/042.phpt =================================================================== RCS file: tests/lang/042.phpt diff -N tests/lang/042.phpt --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ tests/lang/042.phpt 6 Mar 2007 14:43:49 -0000 @@ -0,0 +1,14 @@ +--TEST-- +Dynamic access of constants +--FILE-- +<?php +class A {

+    const B = 'foo';

+} +$classname = 'A'; +echo $classname::B; +?> +===DONE=== +--EXPECT-- +foo +===DONE=== Index: tests/lang/043.phpt =================================================================== RCS file: tests/lang/043.phpt diff -N tests/lang/043.phpt --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ tests/lang/043.phpt 6 Mar 2007 14:43:49 -0000 @@ -0,0 +1,14 @@ +--TEST-- +Dynamic call for static methods +--FILE-- +<?php +class A {

+    static function foo() { return 'bar'; }

+} +$classname = 'A'; +echo $classname::foo(); +?> +===DONE=== +--EXPECT-- +bar +===DONE=== -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php

-- Best regards, Jingcheng Zhang Room 304, Dormitory 26 of Yuquan Campus, Zhejiang University P.R.China