php class.Diff文本或文件内容差异对比代码(类似svn)
代码语言:php
所属分类:文件
下面为部分代码预览,完整代码请点击下载或在bfwstudio webide中打开
<?php
/*
class.Diff.php
A class containing a diff implementation
Created by Stephen Morley - http://stephenmorley.org/ - and released under the
terms of the CC0 1.0 Universal legal code:
http://creativecommons.org/publicdomain/zero/1.0/legalcode
*/
// A class containing functions for computing diffs and formatting the output.
class Diff{
// define the constants
const UNMODIFIED = 0;
const DELETED = 1;
const INSERTED = 2;
/* Returns the diff for two strings. The return value is an array, each of
* whose values is an array containing two values: a line (or character, if
* $compareCharacters is true), and one of the constants DIFF::UNMODIFIED (the
* line or character is in both strings), DIFF::DELETED (the line or character
* is only in the first string), and DIFF::INSERTED (the line or character is
* only in the second string). The parameters are:
*
* $string1 - the first string
* $string2 - the second string
* $compareCharacters - true to compare characters, and false to compare
* lines; this optional parameter defaults to false
*/
public static function compare(
$string1, $string2, $compareCharacters = false){
// initialise the sequences and comparison start and end positions
$start = 0;
if ($compareCharacters){
$sequence1 = $string1;
$sequence2 = $string2;
$end1 = strlen($string1) - 1;
$end2 = strlen($string2) - 1;
}else{
$sequence1 = preg_split('/\R/', $string1);
$sequence2 = preg_split('/\R/', $string2);
$end1 = count($sequence1) - 1;
$end2 = count($sequence2) - 1;
}
// skip any common prefix
while ($start <= $end1 && $start <= $end2
&& $sequence1[$start] == $sequence2[$start]){
$start ++;
}
// skip any common suffix
while ($end1 >= $start && $end2 >= $start
&& $sequence1[$end1] == $sequence2[$end2]){
$end1 --;
$end2 --;
}
// compute the table of longest.........完整代码请登录后点击上方下载按钮下载查看
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