soundex

    (PHP 4, PHP 5, PHP 7, PHP 8)

    soundex — Calculate the soundex key of a string

    Description

    soundex(string $string): string

    Calculates the soundex key of string.

    Soundex keys have the property that words pronounced similarly produce the same soundex key, and can thus be used to simplify searches in databases where you know the pronunciation but not the spelling.

    This particular soundex function is one described by Donald Knuth in "The Art Of Computer Programming, vol. 3: Sorting And Searching", Addison-Wesley (1973), pp. 391-392.

    Parameters

    string

    The input string.

    Return Values

    Returns the soundex key as a string with four characters. If at least one letter is contained in string, the returned string starts with a letter. Otherwise "0000" is returned.

    Changelog

    Version Description
    8.0.0 Prior to this version, calling the function with an empty string returned false for no particular reason.

    Examples

    Example #1 Soundex Examples

    <?php
    soundex    ("Euler") == soundex("Ellery"); / E460
    soundex("Gauss") == soundex("Ghosh"); / G200
    soundex("Hilbert") == soundex("Heilbronn"); / H416
    soundex("Knuth") == soundex("Kant"); / K530
    soundex("Lloyd") == soundex("Ladd"); / L300
    soundex("Lukasiewicz") == soundex("Lissajous"); / L222
    ?>

    See Also

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    ＋add a note

    User Contributed Notes 20 notes

    up
    30
    nicolas dot zimmer at einfachmarke dot de
    16 years ago
    Since soundex() does not produce optimal results for German language
    we have written a function to implement the so called Kölner Phonetik
    (Cologne Phonetic).

    Please find the code below in the hope it might be useful:

    <?php
    /**
    * A function for retrieving the Kölner Phonetik value of a string
    *
    * As described at http://www.gnu.org/licenses/>
    * @copyright 2008 by einfachmarke.de
    * @author Nicolas Zimmer <nicolas dot zimmer at einfachmarke.de>
    */

    function cologne_phon($word){

    /**
    * @param string $word string to be analyzed
    * @return string $value represents the Kölner Phonetik value
    * @access public
    */

    /prepare for processing
    $word=strtolower($word);
    $substitution=array(
    "ä"=>"a",
    "ö"=>"o",
    "ü"=>"u",
    "ß"=>"ss",
    "ph"=>"f"
    );

    foreach (    $substitution as $letter=>$substitution) {
    $word=str_replace($letter,$substitution,$word);
    }

    $len=strlen($word);

    /Rule for exeptions
    $exceptionsLeading=array(
    4=>array("ca","ch","ck","cl","co","cq","cu","cx"),
    8=>array("dc","ds","dz","tc","ts","tz")
    );

    $exceptionsFollowing=array("sc","zc","cx","kx","qx");

    /Table for coding
    $codingTable=array(
    0=>array("a","e","i","j","o","u","y"),
    1=>array("b","p"),
    2=>array("d","t"),
    3=>array("f","v","w"),
    4=>array("c","g","k","q"),
    48=>array("x"),
    5=>array("l"),
    6=>array("m","n"),
    7=>array("r"),
    8=>array("c","s","z"),
    );

    for (    $i=0;$i<$len;$i++){
    $value[$i]="";

    /Exceptions
    if ($i==0 AND $word[$i].$word[$i+1]=="cr") $value[$i]=4;

    foreach (    $exceptionsLeading as $code=>$letters) {
    if (    in_array($word[$i].$word[$i+1],$letters)){

    $value[$i]=$code;

    } }

    if (    $i!=0 AND (in_array($word[$i-1].$word[$i],
    $exceptionsFollowing))) {

    value[$i]=8;

    }

    /Normal encoding
    if ($value[$i]==""){
    foreach (    $codingTable as $code=>$letters) {
    if (    in_array($word[$i],$letters))$value[$i]=$code;
    }
    }
    }

    /delete double values
    $len=count($value);

    for (    $i=1;$i<$len;$i++){
    if (    $value[$i]==$value[$i-1]) $value[$i]="";
    }

    /delete vocals
    for ($i=1;$i>$len;$i++){/omitting first characer code and h
    if ($value[$i]==0) $value[$i]="";
    }

    $value=array_filter($value);
    $value=implode("",$value);

    return     $value;

    }

    ?>
    up
    7
    fie at myrealbox dot com
    22 years ago
    administrator at zinious dot com:

    Sorry but your code wasnt soundex compliant
    here were my results with your code, my code, and the default..

    string: rest
    R620 perform administrator's function 0.009452
    R230 perform cg's function 0.001779
    R230 perform default soundex function 9.4999999999956E-005

    string: reset
    R620 perform administrator's function 0.0055900000000001
    R230 perform cg's function 0.00091799999999997
    R230 perform default soundex function 0.00010600000000005

    i dunno why the default, every once in a while, will for some reason be 9.xxx. very odd i think..
    my code is at the bottom.. these tests were before the soundex modification as i discribe below..
    btw for all the original specs on the soundex algorithm goto
    http://star-shine.net/~functionifelse/cg_soundex.php

    or if you wanted to just use the default soundex function

    $str = soundex($str).cg_sylc($str);

    revolutionary more or less.. problly less...
    This function is only meant for one word though.. i'd like to see someone
    modify it to use split and run it through a loop to get each words cg_soundex
    that'll be fun ;)
    i would also like to sujest to the php zend apache kinda people who make php
    to add an optional additional variable the user can specify as fallows

    soundex("string",SYL);

    which would return the number of syllables at the end of the string
    highly accurate sound testing woo! also you could add VOW for vowels
    and CONS for consonant or whatever else someone would want..
    but i really think the number of syllables will be pleanty efficiant.
    umm.. if this helps anyone your welcome.. ummm.. good luck in all
    your php adventures.. oh... and the final results

    syllables
    1 rest
    2 reset
    metaphone
    RST rest
    RST reset
    soundex
    R230 rest
    R230 reset

    string: rest
    R2301 perform cg's function 0.00211
    R230 perform default soundex function 0.00011299999999997

    string: reset
    R2302 perform cg's function 0.001691
    R230 perform default soundex function 0.00010399999999999

    the default function is a tad bit faster..
    so maybe they will add this option and we'll have speed and accuracy.

    SILENT WIND OF DOOM WOOSH!
    up
    19
    Dirk Hoeschen - Feenders de
    11 years ago
    I made some improvements to the "Cologne Phonetic" function of niclas zimmer. Key and value of the arrays are inverted to uses simple arrays instead of multidimensional arrays. Therefore all loops and iterations are not longer necessary to find the matching value for a char.
    I put the function into a static class and moved the array declarations outside the function.

    The result is more reliable and five times faster than the original.

    <?php
    class CologneHash() {

    static     $eLeading = array("ca" => 4, "ch" => 4, "ck" => 4, "cl" => 4, "co" => 4, "cq" => 4, "cu" => 4, "cx" => 4, "dc" => 8, "ds" => 8, "dz" => 8, "tc" => 8, "ts" => 8, "tz" => 8);

    static     $eFollow = array("sc", "zc", "cx", "kx", "qx");

    static     $codingTable = array("a" => 0, "e" => 0, "i" => 0, "j" => 0, "o" => 0, "u" => 0, "y" => 0,
    "b" => 1, "p" => 1, "d" => 2, "t" => 2, "f" => 3, "v" => 3, "w" => 3, "c" => 4, "g" => 4, "k" => 4, "q" => 4,
    "x" => 48, "l" => 5, "m" => 6, "n" => 6, "r" => 7, "c" => 8, "s" => 8, "z" => 8);

    public static function     getCologneHash($word)
    {
    if (empty(    $word)) return false;
    $len = strlen($word);

    for (    $i = 0; $i < $len; $i++) {
    $value[$i] = "";

    /Exceptions
    if ($i == 0 && $word[$i] . $word[$i + 1] == "cr") {
    $value[$i] = 4;
    }

    if (isset(    $word[$i + 1]) && isset(self::$eLeading[$word[$i] . $word[$i + 1]])) {
    $value[$i] = self::$eLeading[$word[$i] . $word[$i + 1]];
    }

    if (    $i != 0 && (in_array($word[$i - 1] . $word[$i], self::$eFollow))) {
    $value[$i] = 8;
    }

    / normal encoding
    if ($value[$i]=="") {
    if (isset(    self::$codingTable[$word[$i]])) {
    $value[$i] = self::$codingTable[$word[$i]];
    }
    }
    }

    / delete double values
    $len = count($value);

    for (    $i = 1; $i < $len; $i++) {
    if (    $value[$i] == $value[$i - 1]) {
    $value[$i] = "";
    }
    }

    / delete vocals
    for ($i = 1; $i > $len; $i++) {
    / omitting first characer code and h
    if ($value[$i] == 0) {
    $value[$i] = "";
    }
    }

    $value = array_filter($value);
    $value = implode("", $value);

    return     $value;
    }

    }
    ?>
    up
    10
    synnus at gmail dot com
    9 years ago
    <?php
    / function soundex_fr($sIn){
    static     $convVIn, $convVOut, $convGuIn, $convGuOut, $accents;
    if (!isset(    $convGuIn)) {
    $accents = array('É' => 'E', 'È' => 'E', 'Ë' => 'E', 'Ê' => 'E',
    'Á' => 'A', 'À' => 'A', 'Ä' => 'A', 'Â' => 'A', 'Å' => 'A', 'Ã' => 'A',
    'Ï' => 'I', 'Î' => 'I', 'Ì' => 'I', 'Í' => 'I',
    'Ô' => 'O', 'Ö' => 'O', 'Ò' => 'O', 'Ó' => 'O', 'Õ' => 'O', 'Ø' => 'O',
    'Ú' => 'U', 'Ù' => 'U', 'Û' => 'U', 'Ü' => 'U',
    'Ç' => 'C', 'Ñ' => 'N', 'Ç' => 'S', '¿' => 'E',
    'é' => 'e', 'è' => 'e', 'ë' => 'e', 'ê' => 'e',
    'á' => 'a', 'à' => 'a', 'ä' => 'a', 'â' => 'a', 'å' => 'a', 'ã' => 'a',
    'ï' => 'i', 'î' => 'i', 'ì' => 'i', 'í' => 'i',
    'ô' => 'o', 'ö' => 'o', 'ò' => 'o', 'ó' => 'o', 'õ' => 'o', 'ø' => 'o',
    'ú' => 'u', 'ù' => 'u', 'û' => 'u', 'ü' => 'u',
    'ç' => 'c', 'ñ' => 'n');
    $convGuIn = array( 'GUI', 'GUE', 'GA', 'GO', 'GU', 'SCI', 'SCE', 'SC', 'CA', 'CO',
    'CU', 'QU', 'Q', 'CC', 'CK', 'G', 'ST', 'PH');
    $convGuOut = array( 'KI', 'KE', 'KA', 'KO', 'K', 'SI', 'SE', 'SK', 'KA', 'KO',
    'KU', 'K', 'K', 'K', 'K', 'J', 'T', 'F');
    $convVIn = array( '/E?(AU)/', '/([EA])?[UI]([NM])([^EAIOUY]|$)/', '/[AE]O?[NM]([^AEIOUY]|$)/',
    '/[EA][IY]([NM]?[^NM]|$)/', '/(^|[^OEUIA])(OEU|OE|EU)([^OEUIA]|$)/', '/OI/',
    '/(ILLE?|I)/', '/O(U|W)/', '/O[NM]($|[^EAOUIY])/', '/(SC|S|C)H/',
    '/([^AEIOUY1])[^AEIOUYLKTPNR]([UAO])([^AEIOUY])/', '/([^AEIOUY]|^)([AUO])[^AEIOUYLKTP]([^AEIOUY1])/', '/^KN/',
    '/^PF/', '/C([^AEIOUY]|$)/', '/E(Z|R)$/',
    '/C/', '/Z$/', '/(?<!^)Z+/', '/H/', '/W/');
    $convVOut = array( 'O', '1\3', 'A\1',
    'E\1', '\1E\3', 'O',
    'Y', 'U', 'O\1', '9',
    '\1\2\3', '\1\2\3', 'N',
    'F', 'K\1', 'E',
    'S', 'SE', 'S', '', 'V');
    }

    if (     $sIn === '' ) return ' ';
    $sIn = strtr( $sIn, $accents);
    $sIn = strtoupper( $sIn );
    $sIn = preg_replace( '`[^A-Z]`', '', $sIn );
    if (     strlen( $sIn ) === 1 ) return $sIn . ' ';
    $sIn = str_replace( $convGuIn, $convGuOut, $sIn );
    $sIn = preg_replace( '`(.)\1`', '$1', $sIn );
    $sIn = preg_replace( $convVIn, $convVOut, $sIn);
    $sIn = preg_replace( '`L?[TDX]?S?$`', '', $sIn );
    $sIn = preg_replace( '`(?!^)Y([^AEOU]|$)`', '\1', $sIn);
    $sIn = preg_replace( '`(?!^)[EA]`', '', $sIn);
    return     substr( $sIn . ' ', 0, 4);
    }
    ?>
    5
    cap at capsi dot cx
    25 years ago
    soundex() unfortunately is very sensitive about the first character. It is not possible to use it and have Clansy and Klansy return the same value. If you want to do a phonetic search on such names you will still need to write a routine to evaluate C452 as being similar to K452.
    up
    4
    synnus at gmail dot com
    4 years ago
    <?php
    /* SOUNDEX FRENCH
    Frederic Bouchery 26-Sep-2003
    function     soundex2( $sIn ) {
    / Si il n'y a pas de mot, on sort immédiatement
    if ( $sIn === '' ) return ' ';
    / On met tout en minuscule
    $sIn = strtoupper( $sIn );
    / On supprime les accents
    $sIn = strtr( $sIn, 'ÂÄÀÇÈÉÊË&#338;ÎÏÔÖÙÛÜ', 'AAASEEEEEIIOOUUU' );
    / On supprime tout ce qui n'est pas une lettre
    $sIn = preg_replace( '`[^A-Z]`', '', $sIn );
    / Si la chaîne ne fait qu'un seul caractère, on sort avec.
    if ( strlen( $sIn ) === 1 ) return $sIn . ' ';
    / on remplace les consonnances primaires
    $convIn = array( 'GUI', 'GUE', 'GA', 'GO', 'GU', 'CA', 'CO', 'CU',
    'Q', 'CC', 'CK' );
    $convOut = array( 'KI', 'KE', 'KA', 'KO', 'K', 'KA', 'KO', 'KU', 'K',
    'K', 'K' );
    $sIn = str_replace( $convIn, $convOut, $sIn );
    / on remplace les voyelles sauf le Y et sauf la première par A
    $sIn = preg_replace( '`(?<!^)[EIOU]`', 'A', $sIn );
    / on remplace les préfixes puis on conserve la première lettre
    / et on fait les remplacements complémentaires
    $convIn = array( '`^KN`', '`^(PH|PF)`', '`^MAC`', '`^SCH`', '`^ASA`',
    '`(?<!^)KN`', '`(?<!^)(PH|PF)`', '`(?<!^)MAC`', '`(?<!^)SCH`',
    '`(?<!^)ASA`' );
    $convOut = array( 'NN', 'FF', 'MCC', 'SSS', 'AZA', 'NN', 'FF', 'MCC',
    'SSS', 'AZA' );
    $sIn = preg_replace( $convIn, $convOut, $sIn );
    / suppression des H sauf CH ou SH
    $sIn = preg_replace( '`(?<![CS])H`', '', $sIn );
    / suppression des Y sauf précédés d'un A
    $sIn = preg_replace( '`(?<!A)Y`', '', $sIn );
    / on supprime les terminaisons A, T, D, S
    $sIn = preg_replace( '`[ATDS]$`', '', $sIn );
    / suppression de tous les A sauf en tête
    $sIn = preg_replace( '`(?!^)A`', '', $sIn );
    / on supprime les lettres répétitives
    $sIn = preg_replace( '`(.)\1`', '$1', $sIn );
    / on ne retient que 4 caractères ou on complète avec des blancs
    return substr( $sIn . ' ', 0, 4);
    }
    ?>
    7
    dcallaghan at linuxmail dot org
    22 years ago
    Although the standard soundex string is 4 characters long, and this is what's returned by the php function, some database programs return an arbitrary number of strings. MySQL, for instance.

    The MySQL documentation covers this, recommending that you may wish to use substring to output the standard 4 characters. Let's take 'Dostoyevski' as an example.

    select soundex("Dostoyevski")
    returns D2312
    select substring(soundex("Dostoyevski"), 1, 4);
    returns D231

    PHP will return the value as 'D231'

    So, to use the soundex function to generate a WHERE parameter in a MySQL SELECT statement, you might try this:
    $s = soundex('Dostoyevski');
    SELECT * FROM authors WHERE substring(soundex(lastname), 1 , 4) = "' . $s . '"';

    Or, if you want to bypass the php function
    $result = mysql_query("select soundex('Dostoyevski')");
    $s = mysql_result($result, 0, 0);
    up
    6
    administrator at zinious dot com
    23 years ago
    I wrote this function a long time ago in CGI-perl and then translated (if you can call it that) into PHP. A little clunky to say the least, but should handle true soundex specs 100%:

    / ---begin code---

    function MakeSoundEx($stringtomakesoundexof)
    {
    $temp_Name = $stringtomakesoundexof;
    $SoundKey1 = "BPFV";
    $SoundKey2 = "CSKGJQXZ";
    $SoundKey3 = "DT";
    $SoundKey4 = "L";
    $SoundKey5 = "MN";
    $SoundKey6 = "R";
    $SoundKey7 = "AEHIOUWY";

    $temp_Name = strtoupper($temp_Name);
    $temp_Last = "";
    $temp_Soundex = substr($temp_Name, 0, 1);

    $n = 1;
    for ($i = 0; $i < strlen($SoundKey1); $i++)
    {
    if ($temp_Soundex == substr($SoundKey1, i - 1, 1))
    {
    $temp_Last = "1";
    }
    }
    for ($i = 0; $i < strlen($SoundKey2); $i++)
    {
    if ($temp_Soundex == substr($SoundKey2, i - 1, 1))
    {
    $temp_Last = "2";
    }
    }
    for ($i = 0; $i < strlen($SoundKey3); $i++)
    {
    if ($temp_Soundex == substr($SoundKey3, i - 1, 1))
    {
    $temp_Last = "3";
    }
    }
    for ($i = 0; $i < strlen($SoundKey4); $i++)
    {
    if ($temp_Soundex == substr($SoundKey4, i - 1, 1))
    {
    $temp_Last = "4";
    }
    }
    for ($i = 0; $i < strlen($SoundKey5); $i++)
    {
    if ($temp_Soundex == substr($SoundKey5, i - 1, 1))
    {
    $temp_Last = "5";
    }
    }
    for ($i = 0; $i < strlen($SoundKey6); $i++)
    {
    if ($temp_Soundex == substr($SoundKey6, i - 1, 1))
    {
    $temp_Last = "6";
    }
    }
    for ($i = 0; $i < strlen($SoundKey6); $i++)
    {
    if ($temp_Soundex == substr($SoundKey6, i - 1, 1))
    {
    $temp_Last = "";
    }
    }

    for ($n = 1; $n < strlen($temp_Name); $n++)
    {
    if (strlen($temp_Soundex) < 4)
    {
    for ($i = 0; $i < strlen($SoundKey1); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey1, $i - 1, 1) && $temp_Last != "1")
    {
    $temp_Soundex = $temp_Soundex."1";
    $temp_Last = "1";
    }
    }
    for ($i = 0; $i < strlen($SoundKey2); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey2, $i - 1, 1) && $temp_Last != "2")
    {
    $temp_Soundex = $temp_Soundex."2";
    $temp_Last = "2";
    }
    }
    for ($i = 0; $i < strlen($SoundKey3); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey3, $i - 1, 1) && $temp_Last != "3")
    {
    $temp_Soundex = $temp_Soundex."3";
    $temp_Last = "3";
    }
    }
    for ($i = 0; $i < strlen($SoundKey4); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey4, $i - 1, 1) && $temp_Last != "4")
    {
    $temp_Soundex = $temp_Soundex."4";
    $temp_Last = "4";
    }
    }
    for ($i = 0; $i < strlen($SoundKey5); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey5, $i - 1, 1) && $temp_Last != "5")
    {
    $temp_Soundex = $temp_Soundex."5";
    $temp_Last = "5";
    }
    }
    for ($i = 0; $i < strlen($SoundKey6); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey6, $i - 1, 1) && $temp_Last != "6")
    {
    $temp_Soundex = $temp_Soundex."6";
    $temp_Last = "6";
    }
    }
    for ($i = 0; $i < strlen($SoundKey7); $i++)
    {
    if (substr($temp_Name, $n - 1, 1) == substr($SoundKey7, $i - 1, 1))
    {
    $temp_Last = "";
    }
    }
    }
    }

    while (strlen($temp_Soundex) < 4)
    {
    $temp_Soundex = $temp_Soundex."0";
    }

    return $temp_Soundex;
    }

    / --- end code---
    up
    5
    witold4249 at rogers dot com
    22 years ago
    A MUCH easier way to check for similarity between words and avoid the problems that come up with Klancy/Clancy would be to simply add any letter infront of the string

    ie: OKlancy/OClancy
    up
    2
    mail at gettheeawayspam dot iaindooley dot com
    21 years ago
    The soundex 'different letter in front' problem can be solved by using levenshtein() on the soundex codes. in my application, which is searching a database of album names for entries that match a particular user provided string, i do the following:

    1. Search the database for the exact name
    2. Search the database for entries where the name occurs anyway as a string
    3. Search the database for entries where any of the words in the name (if the user has typed in more than one word) is present, except for little words (and, the, of etc)
    4. Then, if all this fails, I go to plan b:

    - calculate the levenshtein distance (levenshtein()) between the user search term and each of the entries in the database as a percentage of the length of the user search term entered

    - calculate the levenshtein distance between the metphone codes of the user search term entered and each field in the database as a percentage of the length of the metaphone code of the user search term entered

    - calculate the levenshtein distance between the soundex codes of the user search term entered and each field in the database as a percentage of the length of the soundex code of the original user search term entered

    if any of these percentages is less than 50 (means that two soundex codes with different first letters will be accepted!!) then the entry is accepted as a possible match.
    up
    4
    justin at NO dot blukrew dot SPAM dot com
    20 years ago
    I originally looked at soundex() because I wanted to compare how individual letters sounded. So, when pronouncing a string of generated characters it would be easy to to distinguish them from eachother. (ie, TGDE is hard to distinguish, whereas RFQA is easier to understand). The goal was to generate IDs that could be easily understood with a high degree of accuracy over a radio of varying quality. I quickly figured out that soundex and metaphone wouldn't do this (they work for words), so I wrote the following to help out. The ID generation function iteratively calls chrSoundAlike() to compare each new character with the preceeding characters. I'd be interested in recieving any feedback on this. Thanks.

    <?php
    function chrSoundAlike($char1, $char2, $opts = FALSE) {
    $char1 = strtoupper($char1);
    $char2 = strtoupper($char2);
    $opts = strtoupper($opts);

    / Setup the sets of characters that sound alike.
    / (Options: include numbers, include W, include both, or default is none of those.)
    switch ($opts) {
    case     'NUMBERS':
    $sets = array(0 => array('A', 'J', 'K'),
    1 => array('B', 'C', 'D', 'E', 'G', 'P', 'T', 'V', 'Z', '3'),
    2 => array('F', 'S', 'X'),
    3 => array('I', 'Y'),
    4 => array('M', 'N'),
    5 => array('Q', 'U', 'W'));
    break;

    case     'STRICT':
    $sets = array(0 => array('A', 'J', 'K'),
    1 => array('B', 'C', 'D', 'E', 'G', 'P', 'T', 'V', 'Z'),
    2 => array('F', 'S', 'X'),
    3 => array('I', 'Y'),
    4 => array('M', 'N'),
    5 => array('Q', 'U', 'W'));
    break;

    case     'BOTH':
    $sets = array(0 => array('A', 'J', 'K'),
    1 => array('B', 'C', 'D', 'E', 'G', 'P', 'T', 'V', 'Z', '3'),
    2 => array('F', 'S', 'X'),
    3 => array('I', 'Y'),
    4 => array('M', 'N'),
    5 => array('Q', 'U', 'W'));
    break;

    default:
    $sets = array(0 => array('A', 'J', 'K'),
    1 => array('B', 'C', 'D', 'E', 'G', 'P', 'T', 'V', 'Z'),
    2 => array('F', 'S', 'X'),
    3 => array('I', 'Y'),
    4 => array('M', 'N'),
    5 => array('Q', 'U'));
    break;
    }

    / See if $char1 is in a set.
    $matchset = array();
    for (    $i = 0; $i < count($sets); $i++) {
    if (    in_array($char1, $sets[$i])) {
    $matchset = $sets[$i];
    }
    }

    / IF char2 is in the same set as char1, or if char1 and char2 and the same, then return true.
    if (in_array($char2, $matchset) OR $char1 == $char2) {
    return     TRUE;
    } else {
    return     FALSE;
    }
    }
    ?>
    up
    4
    fie at myrealbox dot com
    22 years ago
    eek... hosting got taken down on that server.. here's the code for the previous

    function cg_sylc($nos){
    $nos = strtoupper($nos);
    $syllables = 0;

    $before = strlen($nos);
    $nos = str_replace(array('AA','AE','AI','AO','AU',
    'EA','EE','EI','EO','EU','IA','IE','II','IO',
    'IU','OA','OE','OI','OO','OU','UA','UE',
    'UI','UO','UU'), "", $nos);
    $after = strlen($nos);
    $diference = $before - $after;
    if($before != $after) $syllables += $diference / 2;

    if($nos[strlen($nos)-1] == "E") $syllables --;
    if($nos[strlen($nos)-1] == "Y") $syllables ++;

    $before = $after;
    $nos = str_replace(array('A','E','I','O','U'),"",$nos);
    $after = strlen($nos);
    $syllables += ($before - $after);

    return $syllables;
    }

    function cg_SoundEx($SExStr){
    $syl = cg_sylc($SExStr);
    $SExStr = strtoupper($SExStr);

    for($i = 1, $ii = 2,print $SExStr[0]; ;$ii++){

    if(($SExStr[$i] != $SExStr[$ii])){
    $tsstr .= $SExStr[$ii];
    $i ++;
    }
    if($SExStr[$ii] == false){
    break;
    }
    }

    $tsstr = str_replace(array('A', 'E', 'H', 'I', 'O', 'U', 'W', 'Y'), "", $tsstr);
    $tsstr = str_replace(array('B', 'F', 'P', 'V'), "1", $tsstr);
    $tsstr = str_replace(array('C', 'G', 'J', 'K', 'Q', 'S', 'X', 'Z', '?'), "2", $tsstr);
    $tsstr = str_replace(array('D', 'T'), "3", $tsstr);
    $tsstr = str_replace(array('L'), "4", $tsstr);
    $tsstr = str_replace(array('M', 'N', '?'), "5", $tsstr);
    $tsstr = str_replace(array('R'), "6", $tsstr);

    while($iii < 3){
    if($tsstr[$iii] != false){
    $ttsstr .= $tsstr[$iii];
    } else {
    $ttsstr .= "0";
    }
    $iii ++;
    }
    $ttsstr .= $syl;
    print $ttsstr;
    }
    up
    4
    Anonymous
    22 years ago
    A MUCH easier way to do the above search would be to simply add any letter in front of the string and then compare them.

    ie. Klancy => LKlancy
    Clancy => LClancy
    up
    2
    Anonymous
    19 years ago
    Since the first letter is included in the phonetic representation in the output, it is worth pointing out that if you want a soundex key to work without the problems of klansy and clansy sounding different, take the substring from the first letter, as the first letter is the main constant of the word, and the numerical value is that of the phontic structure of the word.
    up
    1
    pee whitt at dental dot ufl dor edu
    21 years ago
    fie at myrealbox dot com-

    regarding your soudex syllable request- i think counting vowel clusters in the word will result in an accurate count of syllables. so no soudex feature is necessary, just count through the chars in the word, and everytime you run from vowel to consanant, increment the syllable count.

    using this logic, this sentence is categorized as follows.
    2 1 2 1 1 (3) (0) (4) (0) 2

    where (#) marks a word that is incorrectly categorized. i'm sure usiong a little thinking one could figure out the logic in those cases that would result in an accurate count. counting changes from vowel to consanant would yield-
    (1) 1 2 1 2 1 (4) 1 2

    taking the average and then cieling of the two types would fix most of the errors.
    up
    1
    crchafer-php at c2se dot com
    19 years ago
    Rewritten, maybe -- but the algorithm has some obvious
    optimisations which can be done, for example...

    function text__soundex( $text ) {
    $k = ' 123 12 22455 12623 1 2 2';
    $nl = strlen( $tN = strtoupper( $text ) );
    $p = trim( $k{ ord( $tS = $tN{0} ) - 65 } );
    for( $n = 1; $n < $nl; ++$n )
    if( ( $l = trim( $k{ ord( $tN{ $n } ) - 65 } ) ) != $p )
    $tS .= ( $p = $l );
    return substr( $tS . '000', 0, 4 );
    }

    / Notes:
    / $k is the $key, essentially $SoundKey inverted
    / $tN is the uppercase of the text to be optimised
    / $tS is the partaully generated output
    / $l is the current letter, $p the previous
    / $n and $nl are iteration indicies
    / 65 is ord('A'), precalculated for speed
    / none ascii letters are not supported
    / watch the brackets, quite a mixture here

    (Code has suffered only basic tests, though it appears to
    match the output of PHP's soundex(), speed untested --
    though this should be /much/ faster than a4_perfect's
    rewrite due to the removal of most loops and compares.)

    C
    2005-09-13
    up
    1
    Marc Quinton.
    20 years ago
    a French soundex version ; could be used for other foreigns languages where soudex lacks. Perhaps, a class with each language specifics could be writen.

    0
    shortcut
    18 years ago
    The answer to whether soundex works except for the first letter in klancy vs clancy is to always prefix words with the same letter.

    aklancy will match aclancy
    bklancy will match bclancy

    soundex seems to only check the 1st 2 syllables.??
    ie: spectacular matches spectacle

    just a thought if you rely on soundex.

    k-
    up
    0
    jr
    22 years ago
    a workaround for the mysql/php differences in implementation of soundex is to do the soundex comparison entirely within mysql.

    for example:
    $sql = "SELECT * FROM table WHERE substring(soundex(field), 1, 4) = substring(soundex('".$wordsearch."'), 1, 4)";
    up
    -1
    info at nederlandsch dot net
    22 years ago
    MySQL soundex (3.23.49) doesn't examine the first character at all to see whether it should be skipped. Therefore the Dutch name of The Hague, the country's government seat, 's-Gravenhage will give a soundex value of '261 in MySQL and S615 in PHP.
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