Make implicit isset/unset inherit get/set modifiers

Closes issue php#39

Author: nikic

Zend/tests/accessors/abstract_accessor_inherit_error.phpt

@@ -13,4 +13,4 @@ class Bar extends Foo { }
 
 ?>
 --EXPECTF--
-Fatal error: Class Foo contains 1 abstract accessor and must be declared abstract or implement the remaining accessors (Foo::$foo->set) in %s on line %d
+Fatal error: Class Foo contains 2 abstract accessors and must be declared abstract or implement the remaining accessors (Foo::$foo->set, Foo::$foo->unset) in %s on line %d

Zend/tests/accessors/isset_unset_inherit_get_set_modifiers.phpt

@@ -0,0 +1,59 @@
+--TEST--
+Isset/unset inherit get/set visibility
+--FILE--
+<?php
+
+abstract class Test {
+    public $foo {
+        protected get;
+        private set;
+    }
+    public $bar {
+        abstract get;
+        final set;
+    }
+}
+
+echo new ReflectionProperty('Test', 'foo');
+echo new ReflectionProperty('Test', 'bar');
+
+?>
+--EXPECTF--
+Accessor [ public $foo ] {
+    Method [ <user> protected method $foo->get ] {
+      @@ %s %d - %d
+    }
+    Method [ <user> private method $foo->set ] {
+      @@ %s %d - %d
+
+      - Parameters [1] {
+        Parameter #0 [ <required> $value ]
+      }
+    }
+    Method [ <user> protected method $foo->isset ] {
+      @@ %s %d - %d
+    }
+    Method [ <user> private method $foo->unset ] {
+      @@ %s %d - %d
+    }
+}
+ ]
+Accessor [ public $bar ] {
+    Method [ <user> abstract public method $bar->get ] {
+      @@ %s %d - %d
+    }
+    Method [ <user> final public method $bar->set ] {
+      @@ %s %d - %d
+
+      - Parameters [1] {
+        Parameter #0 [ <required> $value ]
+      }
+    }
+    Method [ <user> abstract public method $bar->isset ] {
+      @@ %s %d - %d
+    }
+    Method [ <user> final public method $bar->unset ] {
+      @@ %s %d - %d
+    }
+}
+ ]

Zend/zend_compile.c

@@ -1767,13 +1767,19 @@ void zend_do_end_accessor_declaration(znode *function_token, const znode *body T
 void zend_finalize_accessor(TSRMLS_D) { /* {{{ */
 	zend_property_info *property_info = CG(current_property_info);
 
+	zend_uint keep_flags = 0;
+	if ((CG(active_class_entry)->ce_flags & ZEND_ACC_INTERFACE) == 0) {
+		keep_flags = ZEND_ACC_PPP_MASK|ZEND_ACC_FINAL|ZEND_ACC_ABSTRACT;
+	}
+
 	if (!property_info->accs[ZEND_ACCESSOR_ISSET] && property_info->accs[ZEND_ACCESSOR_GET]) {
 		znode zn_fntoken, zn_modifiers, zn_body;
 		INIT_ZNODE(zn_fntoken);
 		ZVAL_LONG(&zn_fntoken.u.constant, T_ISSET);
 
 		INIT_ZNODE(zn_modifiers);
-		Z_LVAL(zn_modifiers.u.constant) = 0;
+		Z_LVAL(zn_modifiers.u.constant)
+			= property_info->accs[ZEND_ACCESSOR_GET]->common.fn_flags & keep_flags;
 
 		INIT_ZNODE(zn_body);
 		Z_LVAL(zn_body.u.constant) = ZEND_ACC_ABSTRACT;
@@ -1787,7 +1793,8 @@ void zend_finalize_accessor(TSRMLS_D) { /* {{{ */
 		ZVAL_LONG(&zn_fntoken.u.constant, T_UNSET);
 
 		INIT_ZNODE(zn_modifiers);
-		Z_LVAL(zn_modifiers.u.constant) = 0;
+		Z_LVAL(zn_modifiers.u.constant)
+			= property_info->accs[ZEND_ACCESSOR_SET]->common.fn_flags & keep_flags;
 
 		INIT_ZNODE(zn_body);
 		Z_LVAL(zn_body.u.constant) = ZEND_ACC_ABSTRACT;