Add a list of blacklisted tags

src/NodaBlacklistedTerms.php

@@ -0,0 +1,49 @@
+<?PHP
+/**
+ * Contains a class of blacklists for unwanted terms.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Contains lists of disallowed terms by language.
+ */
+final class NodaBlacklistedTerms {
+    /**
+     * A blacklist of disallowed tags. All entries are listed in full lowercase.
+     */
+    const TAG_BLACKLIST = [
+        'de' => [
+            'sonstige',
+            'sonst.',
+            'sonst',
+            'andere',
+            'weiteres',
+        ]
+    ];
+
+    /**
+     * Checks if an tag name is blacklisted.
+     *
+     * @param string $lang Input language.
+     * @param string $name Input name to check.
+     *
+     * @return boolean
+     */
+    public static function tagIsInBlacklist(string $lang, string $name):bool {
+
+        $toCheck = \strtolower($name);
+
+        if (!isset(self::TAG_BLACKLIST[$lang])) {
+            return false;
+        }
+
+        if (\in_array($toCheck, self::TAG_BLACKLIST[$lang], true)) {
+            return true;
+        }
+
+        return false;
+
+    }
+}