Migrate Detect Language

src/Ltb/Language.php

@@ -0,0 +1,36 @@
+<?php namespace Ltb;
+/**
+ * detect the preferred language of the user agent
+ *
+ * @copyright Roy Kaldung <[email protected]>
+ * @license http://www.php.net/license/3_01.txt PHP license
+ */
+
+final class Language {
+
+    /**
+     * split request header Accept-Language to determine the UserAgent's
+     * prefered language
+     *
+     * @param string $defaultLanguage preselected default language
+     * @return string returns the default language or a match from $availableLanguages
+     */
+    static function detect_language($defaultLanguage, $availableLanguages): string
+    {
+        $acceptedLanguages = $_SERVER['HTTP_ACCEPT_LANGUAGE'] ? htmlspecialchars($_SERVER['HTTP_ACCEPT_LANGUAGE']) : "";
+        $languageList      = explode(',', $acceptedLanguages);
+        $choosenLanguage= $defaultLanguage;
+        foreach($languageList as $currentLanguage) {
+            $currentLanguage = explode(';', $currentLanguage);
+            if (preg_match('/(..)-?.*/', $currentLanguage[0], $reg)) {
+                foreach($reg as $checkLang) {
+                    if ($match = preg_grep('/'.$checkLang.'/i', $availableLanguages)) {
+                        $choosenLanguage= $match[key($match)];
+                        break 2;
+                    }
+                }
+            }
+        }
+        return $choosenLanguage;
+    }
+}

tests/Ltb/LanguageTest.php

@@ -0,0 +1,48 @@
+<?php
+require __DIR__ . '/../../vendor/autoload.php';
+
+use PHPUnit\Framework\TestCase;
+
+final class LanguageTest extends \Mockery\Adapter\Phpunit\MockeryTestCase
+{
+    function test_accept_all_language() {
+        # User-Agent Language
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = "en";
+
+        $availableLanguages = array("ar","cn","de","el","es","fr","it","nb-NO","pl","pt-PT","ru","sl","tr","zh-CN","ca","cs","ee","en","eu","hu","ja","nl","pt-BR","rs","sk","sv","uk","zh-TW");
+        $defaultLanguage = "en";
+
+        # Execute function
+        $chosenLanguage = \Ltb\Language::detect_language($defaultLanguage, $availableLanguages);
+
+        $this->assertEquals("en", $chosenLanguage);
+    }
+
+    function test_restrict_language() {
+        # User-Agent Language
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = "en";
+
+        $availableLanguages = array("ar","cn","de","el","es","fr","it","nb-NO","pl","pt-PT","ru","sl","tr","zh-CN","ca","cs","ee","en","eu","hu","ja","nl","pt-BR","rs","sk","sv","uk","zh-TW");
+        $allowedLanguages = array("fr");
+        $defaultLanguage = "fr";
+
+        # Execute function
+        $chosenLanguage = \Ltb\Language::detect_language($defaultLanguage, $allowedLanguages ? array_intersect($availableLanguages, $allowedLanguages) : $availableLanguages);
+
+        $this->assertEquals("fr", $chosenLanguage);
+    }
+
+    function test_default_language() {
+        # User-Agent Language
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = "ar, en";
+
+        $availableLanguages = array("ar","cn","de","el","es","fr","it","nb-NO","pl","pt-PT","ru","sl","tr","zh-CN","ca","cs","ee","en","eu","hu","ja","nl","pt-BR","rs","sk","sv","uk","zh-TW");
+        $allowedLanguages = array("fr");
+        $defaultLanguage = "en";
+
+        # Execute function
+        $chosenLanguage = \Ltb\Language::detect_language($defaultLanguage, $allowedLanguages ? array_intersect($availableLanguages, $allowedLanguages) : $availableLanguages);
+
+        $this->assertEquals("en", $chosenLanguage);
+    }
+}