li
1b24994e74
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78 lines
2.1 KiB
PHP
Executable File
78 lines
2.1 KiB
PHP
Executable File
<?php
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namespace addons\kefu\library;
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class StrComparison
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{
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protected $str1;
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protected $str2;
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protected $c = [];
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/*
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* 返回串一和串二的最长公共子序列
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*/
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public function getLCS($str1, $str2, $len1 = 0, $len2 = 0)
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{
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$this->str1 = $str1;
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$this->str2 = $str2;
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if ($len1 == 0) {
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$len1 = strlen($str1);
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}
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if ($len2 == 0) {
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$len2 = strlen($str2);
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}
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$this->initC($len1, $len2);
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return $this->printLCS($this->c, $len1 - 1, $len2 - 1);
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}
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/*
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* 返回两个串的相似度
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*/
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public function getSimilar($str1, $str2)
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{
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$len1 = strlen($str1);
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$len2 = strlen($str2);
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$len = strlen($this->getLCS($str1, $str2, $len1, $len2));
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$similar = $len * 2 / ($len1 + $len2);
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return round($similar * 100, 2);
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}
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public function initC($len1, $len2)
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{
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for ($i = 0; $i < $len1; $i++) {
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$this->c[$i][0] = 0;
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}
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for ($j = 0; $j < $len2; $j++) {
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$this->c[0][$j] = 0;
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}
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for ($i = 1; $i < $len1; $i++) {
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for ($j = 1; $j < $len2; $j++) {
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if ($this->str1[$i] == $this->str2[$j]) {
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$this->c[$i][$j] = $this->c[$i - 1][$j - 1] + 1;
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} elseif ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {
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$this->c[$i][$j] = $this->c[$i - 1][$j];
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} else {
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$this->c[$i][$j] = $this->c[$i][$j - 1];
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}
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}
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}
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}
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public function printLCS($c, $i, $j)
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{
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if ($i == 0 || $j == 0) {
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if ($this->str1[$i] == $this->str2[$j]) {
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return $this->str2[$j];
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} else {
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return "";
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}
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}
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if ($this->str1[$i] == $this->str2[$j]) {
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return $this->printLCS($this->c, $i - 1, $j - 1) . $this->str2[$j];
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} elseif ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {
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return $this->printLCS($this->c, $i - 1, $j);
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} else {
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return $this->printLCS($this->c, $i, $j - 1);
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}
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}
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} |