Added test cases for new functionality

ext/standard/tests/strings/htmlentities15.phpt

@@ -0,0 +1,22 @@
+--TEST--
+htmlentities() test 15 (setlocale / KOI8-R)
+--INI--
+output_handler=
+default_charset=
+mbstring.internal_encoding=none
+--SKIPIF--
+<?php
+$result = (bool)setlocale(LC_CTYPE, "ru_RU.koi8r");
+if (!$result || preg_match('/koi8/i', setlocale(LC_CTYPE, 0)) == 0) {
+	die("skip setlocale() failed\n");
+}
+?>
+--FILE--
+<?php
+setlocale(LC_CTYPE, "ru_RU.koi8r");
+$str = "ÒÏÓËÏÛÎÙÊ";
+var_dump($str, htmlentities($str, ENT_QUOTES, ''));
+?>
+--EXPECT--
+string(9) "ÒÏÓËÏÛÎÙÊ"
+string(63) "&#1088;&#1086;&#1089;&#1082;&#1086;&#1096;&#1085;&#1099;&#1081;"

ext/standard/tests/strings/htmlentities16.phpt

@@ -0,0 +1,23 @@
+--TEST--
+htmlentities() test 16 (mbstring / cp1251)
+--INI--
+output_handler=
+--SKIPIF--
+<?php
+	extension_loaded("mbstring") or die("skip mbstring not available\n");
+	mb_internal_encoding('cp1251');
+	$php_errormsg = NULL;
+	@htmlentities("\x88\xa9\xd2\xcf\xd3\xcb\xcf\xdb\xce\xd9\xca", ENT_QUOTES, '');
+	if ($php_errormsg) {
+		die("skip cp1251 chracter set is not supported on this platform.\n");
+	}
+?>
+--FILE--
+<?php
+mb_internal_encoding('cp1251');
+$str = "\x88\xa9\xf0\xee\xf1\xea\xee\xf8\xed\xfb\xe9";
+var_dump($str, htmlentities($str, ENT_QUOTES, ''));
+?>
+--EXPECT--
+string(11) "ˆ©ÒÏÓËÏÛÎÙÊ"
+string(63) "&euro;&copy;&#1088;&#1086;&#1089;&#1082;&#1086;&#1096;&#1085;&#1099;&#1081;"