Merge branch 'PHP-7.3' into PHP-7.4

Author: nikic

Zend/zend_constants.c

@@ -378,7 +378,9 @@ ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope,
 				ret_constant = NULL;
 			} else {
 				if (!zend_verify_const_access(c, scope)) {
-					zend_throw_error(NULL, "Cannot access %s const %s::%s", zend_visibility_string(Z_ACCESS_FLAGS(c->value)), ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
+					if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
+						zend_throw_error(NULL, "Cannot access %s const %s::%s", zend_visibility_string(Z_ACCESS_FLAGS(c->value)), ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
+					}
 					goto failure;
 				}
 				ret_constant = &c->value;

ext/standard/tests/general_functions/bug72920.phpt

@@ -6,10 +6,7 @@ class Foo {
 	private const C1 = "a";
 }
 
-try {
-	var_dump(constant('Foo::C1'));
-} catch (Error $e) {
-	var_dump($e->getMessage());
-}
---EXPECT--
-string(35) "Cannot access private const Foo::C1"
+var_dump(constant('Foo::C1'));
+--EXPECTF--
+Warning: constant(): Couldn't find constant Foo::C1 in %s on line %d
+NULL

tests/classes/constants_visibility_002.phpt

@@ -21,8 +21,4 @@ constant('A::protectedConst');
 string(14) "protectedConst"
 string(14) "protectedConst"
 
-Fatal error: Uncaught Error: Cannot access protected const A::protectedConst in %s:14
-Stack trace:
-#0 %s(14): constant('A::protectedCon...')
-#1 {main}
-  thrown in %s on line 14
+Warning: constant(): Couldn't find constant A::protectedConst in %s on line %d

tests/classes/constants_visibility_003.phpt

@@ -21,8 +21,4 @@ constant('A::privateConst');
 string(12) "privateConst"
 string(12) "privateConst"
 
-Fatal error: Uncaught Error: Cannot access private const A::privateConst in %s:14
-Stack trace:
-#0 %s(14): constant('A::privateConst')
-#1 {main}
-  thrown in %s on line 14
+Warning: constant(): Couldn't find constant A::privateConst in %s on line %d

tests/classes/constants_visibility_008.phpt

@@ -0,0 +1,12 @@
+--TEST--
+Defined on private constant should not raise exception
+--FILE--
+<?php
+
+class Foo
+{
+    private const BAR = 1;
+}
+echo (int)defined('Foo::BAR');
+--EXPECTF--
+0