[+]: "Use plain PHP for data maps to benefit from OPcache on PHP 5.6+"

-> symfony/polyfill#51

src/voku/helper/UTF8.php

@@ -2620,9 +2620,10 @@ public static function getCharDirection($chr)
    */
   protected static function getData($file)
   {
-    $file = __DIR__ . '/data/' . $file . '.ser';
+    $file = __DIR__ . '/data/' . $file . '.php';
     if (file_exists($file)) {
-      return unserialize(file_get_contents($file));
+      /** @noinspection PhpIncludeInspection */
+      return require $file;
     } else {
       return false;
     }
@@ -4706,7 +4707,7 @@ public static function str_transliterate($str, $unknown = '?')
         $bankfile = __DIR__ . '/data/' . sprintf('x%02x', $bank) . '.php';
         if (file_exists($bankfile)) {
           /** @noinspection PhpIncludeInspection */
-          include $bankfile;
+          require $bankfile;
         } else {
           $UTF8_TO_ASCII[$bank] = array();
         }

src/voku/helper/data/caseFolding_full.php

@@ -0,0 +1,222 @@
+<?php
+
+static $data = array (
+    0 =>
+        array (
+            0 => 'ß',
+            1 => 'İ',
+            2 => 'ʼn',
+            3 => 'ǰ',
+            4 => 'ΐ',
+            5 => 'ΰ',
+            6 => 'և',
+            7 => 'ẖ',
+            8 => 'ẗ',
+            9 => 'ẘ',
+            10 => 'ẙ',
+            11 => 'ẚ',
+            12 => 'ẞ',
+            13 => 'ὐ',
+            14 => 'ὒ',
+            15 => 'ὔ',
+            16 => 'ὖ',
+            17 => 'ᾀ',
+            18 => 'ᾁ',
+            19 => 'ᾂ',
+            20 => 'ᾃ',
+            21 => 'ᾄ',
+            22 => 'ᾅ',
+            23 => 'ᾆ',
+            24 => 'ᾇ',
+            25 => 'ᾈ',
+            26 => 'ᾉ',
+            27 => 'ᾊ',
+            28 => 'ᾋ',
+            29 => 'ᾌ',
+            30 => 'ᾍ',
+            31 => 'ᾎ',
+            32 => 'ᾏ',
+            33 => 'ᾐ',
+            34 => 'ᾑ',
+            35 => 'ᾒ',
+            36 => 'ᾓ',
+            37 => 'ᾔ',
+            38 => 'ᾕ',
+            39 => 'ᾖ',
+            40 => 'ᾗ',
+            41 => 'ᾘ',
+            42 => 'ᾙ',
+            43 => 'ᾚ',
+            44 => 'ᾛ',
+            45 => 'ᾜ',
+            46 => 'ᾝ',
+            47 => 'ᾞ',
+            48 => 'ᾟ',
+            49 => 'ᾠ',
+            50 => 'ᾡ',
+            51 => 'ᾢ',
+            52 => 'ᾣ',
+            53 => 'ᾤ',
+            54 => 'ᾥ',
+            55 => 'ᾦ',
+            56 => 'ᾧ',
+            57 => 'ᾨ',
+            58 => 'ᾩ',
+            59 => 'ᾪ',
+            60 => 'ᾫ',
+            61 => 'ᾬ',
+            62 => 'ᾭ',
+            63 => 'ᾮ',
+            64 => 'ᾯ',
+            65 => 'ᾲ',
+            66 => 'ᾳ',
+            67 => 'ᾴ',
+            68 => 'ᾶ',
+            69 => 'ᾷ',
+            70 => 'ᾼ',
+            71 => 'ῂ',
+            72 => 'ῃ',
+            73 => 'ῄ',
+            74 => 'ῆ',
+            75 => 'ῇ',
+            76 => 'ῌ',
+            77 => 'ῒ',
+            78 => 'ΐ',
+            79 => 'ῖ',
+            80 => 'ῗ',
+            81 => 'ῢ',
+            82 => 'ΰ',
+            83 => 'ῤ',
+            84 => 'ῦ',
+            85 => 'ῧ',
+            86 => 'ῲ',
+            87 => 'ῳ',
+            88 => 'ῴ',
+            89 => 'ῶ',
+            90 => 'ῷ',
+            91 => 'ῼ',
+            92 => 'ff',
+            93 => 'fi',
+            94 => 'fl',
+            95 => 'ffi',
+            96 => 'ffl',
+            97 => 'ſt',
+            98 => 'st',
+            99 => 'ﬓ',
+            100 => 'ﬔ',
+            101 => 'ﬕ',
+            102 => 'ﬖ',
+            103 => 'ﬗ',
+        ),
+    1 =>
+        array (
+            0 => 'ss',
+            1 => 'i̇',
+            2 => 'ʼn',
+            3 => 'ǰ',
+            4 => 'ΐ',
+            5 => 'ΰ',
+            6 => 'եւ',
+            7 => 'ẖ',
+            8 => 'ẗ',
+            9 => 'ẘ',
+            10 => 'ẙ',
+            11 => 'aʾ',
+            12 => 'ss',
+            13 => 'ὐ',
+            14 => 'ὒ',
+            15 => 'ὔ',
+            16 => 'ὖ',
+            17 => 'ἀι',
+            18 => 'ἁι',
+            19 => 'ἂι',
+            20 => 'ἃι',
+            21 => 'ἄι',
+            22 => 'ἅι',
+            23 => 'ἆι',
+            24 => 'ἇι',
+            25 => 'ἀι',
+            26 => 'ἁι',
+            27 => 'ἂι',
+            28 => 'ἃι',
+            29 => 'ἄι',
+            30 => 'ἅι',
+            31 => 'ἆι',
+            32 => 'ἇι',
+            33 => 'ἠι',
+            34 => 'ἡι',
+            35 => 'ἢι',
+            36 => 'ἣι',
+            37 => 'ἤι',
+            38 => 'ἥι',
+            39 => 'ἦι',
+            40 => 'ἧι',
+            41 => 'ἠι',
+            42 => 'ἡι',
+            43 => 'ἢι',
+            44 => 'ἣι',
+            45 => 'ἤι',
+            46 => 'ἥι',
+            47 => 'ἦι',
+            48 => 'ἧι',
+            49 => 'ὠι',
+            50 => 'ὡι',
+            51 => 'ὢι',
+            52 => 'ὣι',
+            53 => 'ὤι',
+            54 => 'ὥι',
+            55 => 'ὦι',
+            56 => 'ὧι',
+            57 => 'ὠι',
+            58 => 'ὡι',
+            59 => 'ὢι',
+            60 => 'ὣι',
+            61 => 'ὤι',
+            62 => 'ὥι',
+            63 => 'ὦι',
+            64 => 'ὧι',
+            65 => 'ὰι',
+            66 => 'αι',
+            67 => 'άι',
+            68 => 'ᾶ',
+            69 => 'ᾶι',
+            70 => 'αι',
+            71 => 'ὴι',
+            72 => 'ηι',
+            73 => 'ήι',
+            74 => 'ῆ',
+            75 => 'ῆι',
+            76 => 'ηι',
+            77 => 'ῒ',
+            78 => 'ΐ',
+            79 => 'ῖ',
+            80 => 'ῗ',
+            81 => 'ῢ',
+            82 => 'ΰ',
+            83 => 'ῤ',
+            84 => 'ῦ',
+            85 => 'ῧ',
+            86 => 'ὼι',
+            87 => 'ωι',
+            88 => 'ώι',
+            89 => 'ῶ',
+            90 => 'ῶι',
+            91 => 'ωι',
+            92 => 'ff',
+            93 => 'fi',
+            94 => 'fl',
+            95 => 'ffi',
+            96 => 'ffl',
+            97 => 'st',
+            98 => 'st',
+            99 => 'մն',
+            100 => 'մե',
+            101 => 'մի',
+            102 => 'վն',
+            103 => 'մխ',
+        ),
+);
+
+$result =& $data;
+unset($data);
+return $result;