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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
