Greek transliteration

transliterate-greek.php

<?php

/**
 * Hackish transliteration rules for greek text.
 * @author Alexandros Sigalas <alxarch@gmail.com>
 * @license Apache License 2.0
 */

class TransliterateGreek
{
    
    //patterns for greeklish text reading
    static  protected $_txtPatterns = array(
    '/(μπ)/u', '/(ντ)/u', '/(τζ)/u', '/(γκ)/u', '/(Μπ)/u', '/(Ντ)/u', '/(Τζ)/u', '/(Γκ)/u',
     '/(Oι|Οί|Ει|Εί|[ΙΊΗΉ]|Υι|Υί)/u', '/(Αι|Αί|[ΕΈ])/u',
     '/(oι|oί|ει|εί|[ιΐϊίηή]|υι|υί)/u', '/(αι|αί|[εέ])/u', '/(ου|ού)/u',
     '/(Ου|Ού)/u',  '/[όο]/u', '/[ωώ]/u', '/[αά]/u', '/β/u', '/γ/u', '/δ/u', '/ζ/u', '/θ/u',
     '/κ/u', '/(λλ)/u', '/λ/u', '/μ/u', '/ν/u', '/ξ/u', '/π/u', '/ρ/u', '/[σς]/u', '/τ/u',
     '/[υΰϋύ]/u', '/φ/u', '/χ/u', '/ψ/u', '/[ΌΟ]/u', '/[ΩΏ]/u', '/[ΑΆ]/u', '/Β/u', '/Γ/u', '/Δ/u',
     '/Z/u',  '/Θ/u', '/Κ/u', '/Λ/u', '/Μ/u','/Ν/u', '/Ξ/u', '/Π/u', '/Ρ/u',
     '/Σ/u', '/Τ/u', '/[ΥΎΫ]/u', '/Φ/u','/Χ/u', '/Ψ/u' );
    static protected $txtReplacements = array(
    'b', 'd', 'j', 'g', 'B', 'D', 'J', 'G', 'I', 'E', 'i', 'e', 'ou',
    'Ou', 'o', 'w', 'a', 'v', 'g', 'd', 'z', 'th', 'k', 'l', 'l', 'm', 'n',
    'x', 'p', 'r', 's', 't', 'y', 'f', 'h', 'ps', 'O', 'W' 'A', 'V', 'G',
    'D', 'Z', 'Th', 'K', 'L', 'M', 'N', 'X', 'P', 'R', 'S', 'T', 'Y',
    'F', 'H', 'Ps' );

    // patterns better for urls
    static protected $_urlPatterns = array(
        '/(μπ)/u', '/(τζ)/u', '/(γκ)/u', '/(Μπ)/u', '/(Τζ)/u', '/(Γκ)/u',
         '/(Oι|Οί|Ει|Εί|[ΙΊΗΥΎΉ]|Υι|Υί)/u', '/(Αι|Αί|[ΕΈ])/u',
         '/(oι|oί|ει|εί|[ιΐϊΰϋίυύηή]|υι|υί)/u', '/(αι|αί|[εέ])/u', '/(ου|ού)/u',
         '/(Ου|Ού)/u',  '/[ωώόο]/u', '/[αά]/u', '/β/u', '/γ/u', '/δ/u', '/ζ/u', '/θ/u',
         '/κ/u', '/(λλ)/u', '/λ/u', '/μ/u', '/ν/u', '/ξ/u', '/π/u', '/ρ/u', '/[σς]/u', '/τ/u',
         '/φ/u', '/χ/u', '/ψ/u', '/[ΩΏΌΟ]/u', '/[ΑΆ]/u', '/Β/u', '/Γ/u', '/Δ/u',
         '/Z/u',  '/Θ/u', '/Κ/u', '/Λ/u', '/Μ/u','/Ν/u', '/Ξ/u', '/Π/u', '/Ρ/u',
         '/Σ/u', '/Τ/u', '/Φ/u','/Χ/u', '/Ψ/u' );
    static protected $_urlReplacements = array(
        'b', 'j', 'g', 'B', 'J', 'G', 'I', 'E', 'i', 'e', 'ou',
        'Ou', 'o', 'a', 'v', 'g', 'd', 'z', 'th', 'k', 'l', 'l', 'm', 'n',
        'x', 'p', 'r', 's', 't', 'f', 'h', 'ps', 'O', 'A', 'V', 'G',
        'D', 'Z', 'Th', 'K', 'L', 'M', 'N', 'X', 'P', 'R', 'S', 'T',
        'F', 'H', 'Ps' );

    static public function transliterate($string, $method='txt')
    {
        switch($method)
        {
            case 'url':
                return preg_replace(self::$_urlPatterns, $_urlReplacements, $string);
                break;
            case 'txt':
            default:
                return preg_replace(self::$_txtPatterns, self::$_txtReplacements, $string);
                break;
        }
    }
}

function transgreek($text, $method="txt")
{
    return TransliterateGreek::transliterate($text, $method);
}