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<?php |
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/** |
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* |
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* @Name : similar-text |
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* @Programmer : Akpé Aurelle Emmanuel Moïse Zinsou |
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* @Date : 2019-04-01 |
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* @Released under : https://github.com/manuwhat/similar-text/blob/master/LICENSE |
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* @Repository : https://github.com/manuwhat/similar |
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* |
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**/ |
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namespace EZAMA{ |
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class jaroWinklerDistance extends distance |
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{ |
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public static function jaroWinkler($a, $b, $round=2) |
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{ |
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if (!is_string($a)||!is_string($b)) { |
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return false; |
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} |
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static $distance=array(); |
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static $previous=array(); |
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if (array($a,$b)===$previous) { |
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return $distance; |
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} |
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$previous=array($a,$b); |
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return self::getJWDistance($a, $b, $distance, $round); |
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} |
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private static function getJWDistance(&$a, &$b, &$distance, $round) |
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{ |
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extract(self::prepareJaroWinkler($a, $b)); |
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for ($i=0,$min=min(count((array)$a), count((array)$b)),$t=0;$i<$min;$i++) { |
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if ($a[$i]!==$b[$i]) { |
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$t++; |
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} |
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} |
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$t/=2; |
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$distance['jaro']=1/3*($corresponding/$ca+$corresponding/$cb+($corresponding-$t)/$corresponding); |
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$distance['jaro-winkler']=$distance['jaro']+(min($longCommonSubstr, 4)*0.1*(1-$distance['jaro'])); |
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$distance=array_map(function ($v) use ($round) { |
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return round($v, $round); |
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}, $distance); |
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return $distance; |
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} |
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private static function prepareJaroWinkler(&$a, &$b) |
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{ |
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$a=self::split($a); |
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$b=self::split($b); |
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$transpositions=array('a'=>array(),'b'=>array(),'corresponding'=>0,'longCommonSubstr'=>0,'ca'=>count((array)$a),'cb'=>count((array)$b)); |
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$Δ=max($transpositions['ca'], $transpositions['cb'])/2-1; |
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self::jwMatches($a, $b, $transpositions, $Δ); |
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ksort($transpositions['a']); |
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ksort($transpositions['b']); |
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$transpositions['a']=array_values($transpositions['a']); |
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$transpositions['b']=array_values($transpositions['b']); |
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return $transpositions; |
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} |
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private static function jwMatches(&$a, &$b, &$transpositions, $Δ) |
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{ |
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foreach ($a as $ind=>$chr) { |
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foreach ($b as $index=>$char) { |
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self::_jwMatches($chr, $char, $index, $ind, $transpositions, $Δ); |
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} |
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} |
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} |
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private static function _jwMatches($chr, $char, $index, $ind, &$transpositions, $Δ) |
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{ |
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if ($chr===$char&&(abs($index-$ind)<=$Δ)) { |
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if ($ind!==$index) { |
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$transpositions['a'][$ind]=$chr; |
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$transpositions['b'][$index]=$char; |
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} else { |
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if ($ind-1<=$transpositions['longCommonSubstr']) { |
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$transpositions['longCommonSubstr']++; |
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} |
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} |
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$transpositions['corresponding']++; |
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} |
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} |
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} |
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} |
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manuwhat /
similar-text
