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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 diceDistance extends distance |
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{ |
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public static function dice($a, $b, $round=2) |
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{ |
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if ($distance=in_array(self::handleVeryCommonDiceCases($a, $b), array(false,0.0,1.0), true)) { |
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return $distance; |
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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, 2); |
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$b=self::split($b, 2); |
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self::diceDistance($distance, $a, $b, $round); |
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return $distance; |
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} |
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private static function handleVeryCommonDiceCases(&$a, &$b) |
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{ |
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if (!is_string($a)||!is_string($b)) { |
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return false; |
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} |
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if (empty($a)||empty($b)) { |
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return 0.0; |
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} |
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if ($a===$b) { |
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return 1.0; |
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} |
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} |
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private static function diceDistance(&$distance, &$a, &$b, $round) |
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{ |
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$ca=($caGrams=count($a))*2-self::getEndStrLen($a); |
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$cb=($cbGrams=count($b))*2-self::getEndStrLen($b); |
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$distance=round(2*count($caGrams>$cbGrams?array_intersect($a, $b):array_intersect($b, $a))/($ca+$cb), $round); |
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} |
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private static function getEndStrLen($a) |
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{ |
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if (function_exists('array_key_last')) { |
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$end=array_key_last($a); |
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$end=(isset($end[1]))?0:1; |
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} else { |
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$end=end($a); |
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$end=(isset($end[1]))?0:1; |
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reset($a); |
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} |
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return $end; |
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} |
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} |
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} |
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manuwhat /
similar-text
