Initial implementation of EUC-KR

lib/Encoding/Big5.php

@@ -144,7 +144,6 @@ class Big5 implements StatelessEncoding {
             } else { // the second byte is part of a two-byte sequence, but it's unclear if it's the lead or trail byte
                 $start = $this->posByte + 2;
                 $pos = $this->posByte;
-                $b = $b2;
                 // go back bytes until a definite trail byte or start of string
                 while ($pos > 0) {
                     $b = ord(@$this->string[--$pos]);

tests/phpunit.xml

@@ -25,6 +25,7 @@
         <file>cases/Encoding/TestXUserDefined.php</file>
         <file>cases/Encoding/TestGB18030.php</file>
         <file>cases/Encoding/TestBig5.php</file>
+        <file>cases/Encoding/TestEUCKR.php</file>
     </testsuite>
 </testsuites>
 </phpunit>

tools/mktest.php

@@ -15,6 +15,9 @@ $tests = [
         'standard characters' => "https://raw.githubusercontent.com/web-platform-tests/wpt/master/encoding/legacy-mb-tchinese/big5/big5_chars.html",
         'extended characters' => "https://raw.githubusercontent.com/web-platform-tests/wpt/master/encoding/legacy-mb-tchinese/big5/big5_chars_extra.html",
     ],
+    'euc-kr' => [
+        'characters' => "https://raw.githubusercontent.com/web-platform-tests/wpt/master/encoding/legacy-mb-korean/euc-kr/euckr_chars.html",
+    ],
     'euc-jp' => [
         'characters' => "https://raw.githubusercontent.com/web-platform-tests/wpt/master/encoding/legacy-mb-japanese/euc-jp/eucjp_chars.html",
     ],