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  • PHP检查字符串相似度

    class LCS {
        var $str1;
        var $str2;
        var $c = array();
        /*返回串一和串二的最长公共子序列
    */
        function getLCS($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, $len2 - 1);
        }
        /*返回两个串的相似度
    */
        function getSimilar($str1, $str2) {
            $len1 = strlen($str1);
            $len2 = strlen($str2);
            $len = strlen($this->getLCS($str1, $str2, $len1, $len2));
            return $len * 2 / ($len1 + $len2);
        }
        function initC($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);
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/zhaobijin/p/5813330.html
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