Preserve class-name case in ReflectionClass::getProperty()

When given a "Class::property" argument, getProperty() lowercased the
class part before looking it up, so the "Class ... does not exist"
exception printed the lowercased name and autoloaders received it in
lowercase, breaking case-sensitive (PSR-4) autoloaders.

Pass the class name to zend_lookup_class() as given - it lowercases
internally for the class-table lookup - matching what ReflectionMethod
and ReflectionProperty already do.

Author: jorgsowa

ext/reflection/php_reflection.c

@@ -4635,9 +4635,7 @@ ZEND_METHOD(ReflectionClass, getProperty)
 	str_name = ZSTR_VAL(name);
 	if ((tmp = strstr(ZSTR_VAL(name), "::")) != NULL) {
 		classname_len = tmp - ZSTR_VAL(name);
-		classname = zend_string_alloc(classname_len, 0);
-		zend_str_tolower_copy(ZSTR_VAL(classname), ZSTR_VAL(name), classname_len);
-		ZSTR_VAL(classname)[classname_len] = '\0';
+		classname = zend_string_init(ZSTR_VAL(name), classname_len, 0);
 		str_name_len = ZSTR_LEN(name) - (classname_len + 2);
 		str_name = tmp + 2;
 

ext/reflection/tests/ReflectionClass_getProperty_003.phpt

@@ -244,4 +244,4 @@ Fully qualified property name X::$privC does not specify a base class of C
 --- (Reflecting on X::doesNotExist) ---
 Fully qualified property name X::$doesNotExist does not specify a base class of C
 --- (Reflecting on doesNotexist::doesNotExist) ---
-Class "doesnotexist" does not exist
+Class "doesNotexist" does not exist

ext/reflection/tests/ReflectionClass_getProperty_004.phpt

@@ -248,4 +248,4 @@ Fully qualified property name X::$privC does not specify a base class of C
 --- (Reflecting on X::doesNotExist) ---
 Fully qualified property name X::$doesNotExist does not specify a base class of C
 --- (Reflecting on doesNotexist::doesNotExist) ---
-Class "doesnotexist" does not exist
+Class "doesNotexist" does not exist

ext/reflection/tests/ReflectionClass_getProperty_case_preservation.phpt

@@ -0,0 +1,22 @@
+--TEST--
+ReflectionClass::getProperty() preserves the case of the class name in errors and autoloading
+--FILE--
+<?php
+class C {
+    public $p;
+}
+
+spl_autoload_register(function ($name) {
+    echo "Autoloading $name\n";
+});
+
+$rc = new ReflectionClass('C');
+try {
+    $rc->getProperty("Some\\MixedCase::p");
+} catch (ReflectionException $e) {
+    echo $e->getMessage(), "\n";
+}
+?>
+--EXPECT--
+Autoloading Some\MixedCase
+Class "Some\MixedCase" does not exist