<?php
/**
* CLASS soundex2
* soundex2 French version
* based on the algorithm described here : http://sqlpro.developpez.com/cours/soundex/ by Frédéric BROUARD
*
* author Johan Barbier <[email protected]>
*/
class soundex2 {
/**
* public sString
* main string we work on
*/
var $sString = '';
/**
* vowels replacement array
*/
var $aReplaceVoy1 = array (
'E' => 'A',
'I' => 'A',
'O' => 'A',
'U' => 'A'
);
/**
* consonnants replacement array
*/
var $aReplaceGrp1 = array (
'GUI' => 'KI',
'GUE' => 'KE',
'GA' => 'KA',
'GO' => 'KO',
'GU' => 'K',
'CA' => 'KA',
'CO' => 'KO',
'CU' => 'KU',
'Q' => 'K',
'CC' => 'K',
'CK' => 'K'
);
/**
* other replacement array
*/
var $aReplaceGrp2 = array (
'ASA' => 'AZA',
'KN' => 'NN',
'PF' => 'FF',
'PH' => 'FF',
'SCH' => 'SSS'
);
/**
* endings replacement array
*/
var $aEnd = array (
'A',
'T',
'D',
'S'
);
/**
* public function build
* core function of the class, go through the whole process
* @Param string sString : the string we want to check
*/
function build ($sString) {
/**
* let's check it's a real string...
*/
if (is_string ($sString) && !empty ($sString)) {
$this -> sString = $sString;
} else {
trigger_error ('Parameter string must not be empty', E_USER_ERROR);
}
/**
* remove starting and ending spaces
*/
$this -> sString = trim ($this -> sString);
/**
* remove special french characters
*/
$this -> trimAccent ();
/**
* string to upper case
*/
$this -> sString = strtoupper ($this -> sString );
/**
* let's remove every space in the string
*/
$this -> sString = str_replace (' ', '', $this -> sString);
/**
* let's remove every '-' in the string
*/
$this -> sString = str_replace ('-', '', $this -> sString);
/**
* let's process through the first replacement array
*/
$this -> arrReplace ($this -> aReplaceGrp1);
/**
* let's process through th vowels replacement
*/
$sChar = substr ($this -> sString, 0, 1);
$this -> sString = substr ($this -> sString, 1, strlen ($this -> sString) - 1);
$this -> arrReplace ($this -> aReplaceVoy1);
$this -> sString = $sChar.$this -> sString;
/**
* let's process through the second replacement array
*/
$this -> arrReplace ($this -> aReplaceGrp2, true);
/**
* let's remove every 'H' but those prededed by a 'C' or an 'S'
*/
$this -> sString = preg_replace ('/(?<![CS])H/', '', $this -> sString);
/**
* let's remove every 'Y' but those preceded by an 'A'
*/
$this -> sString = preg_replace ('/(?<!A)Y/', '', $this -> sString);
/**
* remove endings in aEnd
*/
$length = strlen ($this -> sString) - 1;
if (in_array ($this -> sString{$length}, $this -> aEnd)) {
$this -> sString = substr ($this -> sString, 0, $length);
}
/**
* let's remove every 'A', but the one at the beginning of the string, if any.
*/
$sChar = '';
if ($this -> sString{0} === 'A') {
$sChar = 'A';
}
$this -> sString = str_replace ('A', '', $this -> sString);
$this -> sString = $sChar.$this -> sString;
/**
* let's have only 1 occurence of each letter
*/
$this -> sString = preg_replace( '/(.)\1/', '$1', $this -> sString );
/**
* let's have the final code : a 4 letters string
*/
$this -> getFinal ();
}
/**
* private function getFinal
* gets the first 4 letters, pads the string with white space if the string length < 4
*/
function getFinal () {
if (strlen ($this -> sString) < 4) {
$this -> sString = str_pad ($this -> sString, 4, ' ', STR_PAD_RIGHT);
} else {
$this -> sString = substr ($this -> sString, 0, 4);
}
}
/**
* private function trimAccent
* remove every special French letters
*/
function trimAccent () {
$this -> sString = htmlentities(strtolower($this -> sString ));
$this -> sString = preg_replace("/&(.)(acute|cedil|circ|ring|tilde|uml|grave);/", "$1", $this -> sString );
$this -> sString = preg_replace("/([^a-z0-9]+)/", "-", html_entity_decode($this -> sString ));
$this -> sString = trim($this -> sString , "-");
}
/**
* private function arrReplace
* replacement method, given an array
* @Param array tab : the replacement array to be used
* @Param bool pref : if false, just replace keys by values; if true, do the same but only with prefix
*/
function arrReplace ($tab, $pref = false) {
$fromRep = array_keys ($tab);
$toRep = array_values ($tab);
if (false === $pref) {
$this -> sString = str_replace ($fromRep, $toRep, $this -> sString);
} else {
foreach ($fromRep as $clef => $val) {
$length = strlen ($val);
if (substr ($this -> sString, 0, $length) === $val) {
$this -> sString = substr_replace ($this -> sString, $toRep[$clef], 0, $length);
}
}
}
}
}
?>
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