一、介绍

用于比较两段文字内容的重复率

二、运行结果

三、代码

<?php
/*** 内容相似度计算*/
class GetSimilar{function __construct(){}function getSimilar($str1, $str2) {$len1 = strlen($str1);$len2 = strlen($str2);$len = strlen($this->getLCS($str1, $str2, $len1, $len2));return $len * 2 / ($len1 + $len2);}function getLCS($str1, $str2, $len1 = 0, $len2 = 0) {$this->str1 = $str1;$this->str2 = $str2;if ($len1 == 0) $len1 = strlen($str1);if ($len2 == 0) $len2 = strlen($str2);$this->initC($len1, $len2);return $this->printLCS($this->c, $len1 - 1, $len2 - 1);}function initC($len1, $len2) {for ($i = 0; $i < $len1; $i++) $this->c[$i][0] = 0;for ($j = 0; $j < $len2; $j++) $this->c[0][$j] = 0;for ($i = 1; $i < $len1; $i++) {for ($j = 1; $j < $len2; $j++) {if ($this->str1[$i] == $this->str2[$j]) {$this->c[$i][$j] = $this->c[$i - 1][$j - 1] + 1;} else if ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {$this->c[$i][$j] = $this->c[$i - 1][$j];} else {$this->c[$i][$j] = $this->c[$i][$j - 1];}}}}function printLCS($c, $i, $j) {if ($i == 0 || $j == 0) {if ($this->str1[$i] == $this->str2[$j]) return $this->str2[$j];else return "";}if ($this->str1[$i] == $this->str2[$j]) {return $this->printLCS($this->c, $i - 1, $j - 1).$this->str2[$j];} else if ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {return $this->printLCS($this->c, $i - 1, $j);} else {return $this->printLCS($this->c, $i, $j - 1);}}function test(){echo 123;}
}
$GetSimilar = new GetSimilar();
$str1 = '这是一个字符串相似度计算的例子';
$str2 = '这个例子用来计算字符串相似度的例子';
$similarRate = $GetSimilar->getSimilar($str1, $str2);
echo '字符串1:'.$str1;
echo "<br>";
echo '字符串2:'.$str2;
echo "<br>";
echo '结果:'.$similarRate;