PHP 5.3 compatibility

.travis.yml

@@ -4,13 +4,15 @@ php:
   - 7.0
   - 5.6
   - 5.5
+  - 5.4
+  - 5.3
   - hhvm
 
 sudo: false
 
 before_script:
   - composer self-update
-  - composer update --no-interaction
+  - composer install --no-interaction
 
 script:
   - phpunit --coverage-clover tests/clover.xml

app/I18N.php

@@ -352,6 +352,8 @@ public static function htmlAttributes() {
 	public static function init($code = null) {
 		global $WT_TREE;
 
+		mb_internal_encoding('UTF-8');
+
 		if ($code !== null) {
 			// Create the specified locale
 			self::$locale = Locale::create($code);
@@ -678,7 +680,7 @@ public static function strcasecmp($string1, $string2) {
 	 */
 	public static function strtolower($string) {
 		if (self::$locale->language()->code() === 'tr' || self::$locale->language()->code() === 'az') {
-			$string = strtr($string, ['I' => 'ı', 'İ' => 'i']);
+			$string = strtr($string, array('I' => 'ı', 'İ' => 'i'));
 		}
 
 		return mb_strtolower($string);
@@ -695,7 +697,7 @@ public static function strtolower($string) {
 	 */
 	public static function strtoupper($string) {
 		if (self::$locale->language()->code() === 'tr' || self::$locale->language()->code() === 'az') {
-			$string = strtr($string, ['ı' => 'I', 'i' => 'İ']);
+			$string = strtr($string, array('ı' => 'I', 'i' => 'İ'));
 		}
 
 		return mb_strtoupper($string);

composer.json

@@ -24,7 +24,7 @@
 		"fabpot/php-cs-fixer": "*",
 		"mockery/mockery": "*",
 		"phpunit/phpunit": "*",
-		"satooshi/php-coveralls": "dev-master"
+		"satooshi/php-coveralls": "~1.0"
 	},
 	"extra": {
 		"branch-alias": {