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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 levenshteinDistance extends distance |
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{ |
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public static function levenshtein($a, $b) |
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{ |
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if (!is_string($a)||!is_string($b)) { |
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return false; |
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} |
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static $distance=0; |
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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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$a=self::split($a); |
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$b=self::split($b); |
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$ca = count((array)$a); |
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$cb = count((array)$b); |
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$dis = range(0, $cb); |
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self::BuildLevenshteinCostMatrix($a, $b, $ca, $cb, $dis); |
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return $distance=$dis[$cb]; |
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} |
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public static function levenshteinDamerau($a, $b) |
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{ |
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if (!is_string($a)||!is_string($b)) { |
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return false; |
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} |
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static $distance=0; |
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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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$a=self::split($a); |
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$b=self::split($b); |
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$ca = count((array)$a); |
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$cb = count((array)$b); |
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$dis = range(0, $cb); |
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self::BuildLevenshteinCostMatrix($a, $b, $ca, $cb, $dis, true); |
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return $distance=$dis[$cb]; |
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} |
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private static function BuildLevenshteinCostMatrix($a, $b, $ca, $cb, &$dis, $damerau=false) |
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{ |
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$dis_new=array(); |
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for ($x=1;$x<=$ca;$x++) { |
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$dis_new[0]=$x; |
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for ($y=1;$y<=$cb;$y++) { |
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self::costMatrix($a, $b, $dis_new, $dis, $damerau, $x, $y); |
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} |
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$dis = $dis_new; |
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} |
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} |
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private static function costMatrix(&$a, &$b, &$dis_new, &$dis, $damerau, $x, $y) |
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{ |
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$c = ($a[$x-1] == $b[$y-1])?0:1; |
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$dis_new[$y] = min($dis[$y]+1, $dis_new[$y-1]+1, $dis[$y-1]+$c); |
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if ($damerau) { |
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if ($x > 1 && $y > 1 && $a[$x-1] == $b[$y-2] && $a[$x-2] == $b[$y-1]) { |
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$dis_new[$y]= min($dis_new[$y-1], $dis[$y-3] + $c) ; |
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} |
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} |
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} |
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} |
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} |
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manuwhat /
similar-text
