UpsideDownText.php

<?php

namespace UpsideDownText;

class UpsideDownText {
    public static function convert_to_upsidedown_unicode($match)
    {
        $flipTable = array(
            '!' => '¡',
            '¡' => '!',
            '"' => ',,',
            '&' => '⅋',
            "'" => ',',
            '(' => ')',
            ')' => '(',
            ',' =>  "'",
            '.' => '˙',
            '0' => '0',
            '1' => 'Ɩ',
            '2' => 'ᄅ',
            '3' => 'Ɛ',
            '4' => 'ᔭ',
            '5' => 'ϛ',
            '6' => '9',
            '7' => 'ㄥ',
            '8' => '8',
            '9' => '6',
            '<' => '>',
            '>' => '<',
            '?' => '¿',
            'A' => 'ɐ',
            'B' => 'q',
            'C' => 'ɔ',
            'D' => 'p',
            'E' => 'ǝ',
            'F' => 'ɟ',
            'G' => 'ƃ',
            'H' => 'ɥ',
            'I' => 'ᴉ',
            'J' => 'ɾ',
            'K' => 'ʞ',
            'L' => 'l',
            'M' => 'ɯ',
            'N' => 'u',
            'Ñ' => 'ñ',
            'O' => 'o',
            'P' => 'd',
            'Q' => 'b',
            'R' => 'ɹ',
            'S' => 's',
            'T' => 'ʇ',
            'U' => 'n',
            'V' => 'ʌ',
            'W' => 'ʍ',
            'X' => 'x',
            'Y' => 'ʎ',
            'Z' => 'z',
            '[' => ']',
            ']' => '[',
            '_' => '‾',
            'a' => 'ɐ',
            'b' => 'q',
            'c' => 'ɔ',
            'd' => 'p',
            'e' => 'ǝ',
            'f' => 'ɟ',
            'g' => 'ƃ',
            'h' => 'ɥ',
            'i' => 'ᴉ',
            'j' => 'ɾ',
            'k' => 'ʞ',
            'l' => 'l',
            'm' => 'ɯ',
            'n' => 'u',
            'ñ' => 'ñ',
            'o' => 'o',
            'p' => 'd',
            'q' => 'b',
            'r' => 'ɹ',
            's' => 's',
            't' => 'ʇ',
            'u' => 'n',
            'v' => 'ʌ',
            'w' => 'ʍ',
            'x' => 'x',
            'y' => 'ʎ',
            'z' => 'z',
            '{' => '}',
            '}' => '{'
        );

        $origStr = strrev($match);
        $newStr = ' ';
        for ($i = 0; $i < strlen($origStr); $i++) {
            $ch = $origStr[$i];
            if (array_key_exists($ch, $flipTable))
                $newStr .= $flipTable[$ch];
            else
                $newStr .= $ch;
        }
        return $newStr;
    }
}