Fixed bug #42820 (defined() on constant with namespace prefixes tries to load class).

NEWS

@@ -35,6 +35,8 @@ PHP                                                                        NEWS
 - Improved and cleaned CGI code. FastCGI is now always enabled and can not be
   disabled. See sapi/cgi/CHANGES for more details. (Dmitry)
 
+- Fixed bug #42820 (defined() on constant with namespace prefixes tries to load
+  class). (Dmitry)
 - Fixed bug #42798 (__autoload() not triggered for classes used in method
   signature). (Dmitry)
 - Fixed bug #42657 (ini_get() returns incorrect value when default is NULL).

Zend/tests/bug42820.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Bug #42820 (defined() on constant with namespace prefixes tries to load class)
+--FILE--
+<?php
+namespace ns;
+const ok = 0;
+class foo {
+	const ok = 0;
+}
+var_dump(defined('ns::ok'));
+var_dump(defined('ns::bug'));
+var_dump(defined('::ns::ok'));
+var_dump(defined('::ns::bug'));
+var_dump(defined('ns::foo::ok'));
+var_dump(defined('ns::foo::bug'));
+var_dump(defined('::ns::foo::ok'));
+var_dump(defined('::ns::foo::bug'));
+var_dump(defined('ns::bar::bug'));
+var_dump(defined('::ns::bar::bug'));
+--EXPECT--
+bool(true)
+bool(false)
+bool(true)
+bool(false)
+bool(true)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+

Zend/zend_builtin_functions.c

@@ -545,7 +545,7 @@ ZEND_FUNCTION(defined)
 	}
 	
 	convert_to_string_ex(var);
-	if (zend_get_constant_ex(Z_STRVAL_PP(var), Z_STRLEN_PP(var), &c, NULL, 0 TSRMLS_CC)) {
+	if (zend_get_constant_ex(Z_STRVAL_PP(var), Z_STRLEN_PP(var), &c, NULL, ZEND_FETCH_CLASS_SILENT TSRMLS_CC)) {
 		zval_dtor(&c);
 		RETURN_TRUE;
 	} else {

Zend/zend_compile.h

@@ -597,9 +597,11 @@ int zendlex(znode *zendlval TSRMLS_DC);
 #define ZEND_FETCH_CLASS_AUTO		5
 #define ZEND_FETCH_CLASS_INTERFACE	6
 #define ZEND_FETCH_CLASS_STATIC		7
+#define ZEND_FETCH_CLASS_MASK        0x0f
 #define ZEND_FETCH_CLASS_RT_NS_CHECK 0x20
 #define ZEND_FETCH_CLASS_RT_NS_NAME  0x40
 #define ZEND_FETCH_CLASS_NO_AUTOLOAD 0x80
+#define ZEND_FETCH_CLASS_SILENT      0x0100
 
 /* variable parsing type (compile-time) */
 #define ZEND_PARSED_MEMBER				(1<<0)

Zend/zend_constants.c

@@ -274,7 +274,7 @@ ZEND_API int zend_get_constant_ex(char *name, uint name_len, zval *result, zend_
 	if (name[0] == ':' && name[1] == ':') {
 		name += 2;
 		name_len -= 2;
-		flags = 0;
+		flags &= ZEND_FETCH_CLASS_SILENT;
 	}
 
 	
@@ -374,7 +374,9 @@ ZEND_API int zend_get_constant_ex(char *name, uint name_len, zval *result, zend_
 					retval = 1;
 					return zend_get_constant(name, name_len, result TSRMLS_CC);
 				}
-				zend_error(E_ERROR, "Class '%s' not found", class_name);
+				if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
+					zend_error(E_ERROR, "Class '%s' not found", class_name);
+				}
 			}
 			retval = 0;
 		}

Zend/zend_execute_API.c

@@ -1513,8 +1513,9 @@ zend_class_entry *zend_fetch_class(const char *class_name, uint class_name_len,
 	zend_class_entry **pce;
 	int use_autoload = (fetch_type & ZEND_FETCH_CLASS_NO_AUTOLOAD) == 0;
 	int rt_ns_check  = (fetch_type & ZEND_FETCH_CLASS_RT_NS_CHECK)  ? 1 : 0;
+	int silent       = (fetch_type & ZEND_FETCH_CLASS_SILENT) != 0;
 
-	fetch_type = fetch_type & ~ZEND_FETCH_CLASS_NO_AUTOLOAD;
+	fetch_type &= ZEND_FETCH_CLASS_MASK;
 check_fetch_type:
 	switch (fetch_type) {
 		case ZEND_FETCH_CLASS_SELF:
@@ -1568,10 +1569,12 @@ check_fetch_type:
 			    zend_lookup_class_ex(class_name, class_name_len, 1, &pce TSRMLS_CC)==SUCCESS) {
 				return *pce;
 			}
-			if (fetch_type == ZEND_FETCH_CLASS_INTERFACE) {
-				zend_error(E_ERROR, "Interface '%s' not found", class_name);
-			} else {
-				zend_error(E_ERROR, "Class '%s' not found", class_name);
+			if (!silent) {
+				if (fetch_type == ZEND_FETCH_CLASS_INTERFACE) {
+					zend_error(E_ERROR, "Interface '%s' not found", class_name);
+				} else {
+					zend_error(E_ERROR, "Class '%s' not found", class_name);
+				}
 			}
 		}
 		return NULL;