这个类可以查找和查看文本字符串之间的差异。 它有两个文本字符串和使用的差异算法来找出它们之间的差异，并返回一个列表的变化，来修补原来的字符串成为最后的字符串。 PHP 源码与演示： 源码出处演示出处 ?php/* *from:http://www.codepearl.com */require(
这个类可以查找和查看文本字符串之间的差异。
它有两个文本字符串和使用的差异算法来找出它们之间的差异，并返回一个列表的变化，来修补原来的字符串成为最后的字符串。
PHP
源码与演示：源码出处 演示出处
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<?php
/*
*from:http://www.codepearl.com
*/
require('diff.php');
$before = IsSet($_POST['before']) ? $_POST['before'] : 'Some text before';
$after = IsSet($_POST['after']) ? $_POST['after'] : 'This is the text after';
$mode = (IsSet($_POST['mode']) ? $_POST['mode'] : 'w');
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html lang="en">
<head>
<title>Test the Diff Object</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
<style type="text/css">
* { font-family: sans-serif,arial,helvetica }
</style>
<body>
<form method="POST" action="?">
<div><label for="before">Before</label><br>
<textarea id="before" cols="80" rows="10" name="before"><?php echo HtmlSpecialChars($before); ?></textarea></div>
<div><label for="after">After</label><br>
<textarea id="after" cols="80" rows="10" name="after"><?php echo HtmlSpecialChars($after); ?></textarea></div>
<div><input type="submit" name="compare" value="Compare"> by <select name="mode">
<option value="c"<?php if($mode === 'c') echo ' selected'; ?>>Character</option>
<option value="w"<?php if($mode === 'w') echo ' selected'; ?>>Word</option>
<option value="l"<?php if($mode === 'l') echo ' selected'; ?>>Line</option>
</select></div>
<?php
if(IsSet($_POST['compare']))
{
$diff = new diff_class;
$difference = new stdClass;
$difference->mode = $mode;
if($diff->FormatDiffAsHtml($before, $after, $difference))
echo '<div>Difference<br><div style="border-style: solid; border-width: 1px">', $difference->html, '</div></div>';
else
echo '<div>Error: ', HtmlSpecialChars($diff->error), '</div>';
}
?>
</form>
</body>
</html>
<?php
/*
*from：http://www.codepearl.com
*/
/*
{metadocument}<?xml version="1.0" encoding="ISO-8859-1" ?>
<class>
<package>http://www.codepearl.com</package>
<version>@(#) $Id: diff.php,v 1.4 2013/11/06 21:19:07 mlemos Exp $</version>
<copyright>Copyright ?(C) http://www.codepearl.com</copyright>
<title>OAuth client</title>
<author>Manuel Lemos</author>
<authoraddress>http://www.codepearl.com</authoraddress>
<documentation>
<idiom>en</idiom>
<purpose>.</purpose>
<usage>.</usage>
</documentation>
{/metadocument}
*/
class diff_class
{
var $error = '';
var $insertedStyle = 'font-weight: bold';
var $deletedStyle = 'text-decoration: line-through';
Function SplitString($string, $separators, $end, &$positions)
{
$l = strlen($string);
$split = array();
for($p = 0; $p < $l;)
{
$e = strcspn($string, $separators.$end, $p);
$e += strspn($string, $separators, $p + $e);
$split[] = substr($string, $p, $e);
$positions[] = $p;
$p += $e;
if(strlen($end)
&& ($e = strspn($string, $end, $p)))
{
$split[] = substr($string, $p, $e);
$positions[] = $p;
$p += $e;
}
}
$positions[] = $p;
return $split;
}
/*
{metadocument}
<function>
<name>Diff</name>
<type>BOOLEAN</type>
<documentation>
<purpose>.</purpose>
<usage>.</usage>
</documentation>
<argument>
<name>before</name>
<type>STRING</type>
<documentation>
<purpose>.</purpose>
</documentation>
</argument>
<argument>
<name>after</name>
<type>STRING</type>
<documentation>
<purpose>.</purpose>
</documentation>
</argument>
<argument>
<name>difference</name>
<type>HASH</type>
<out />
<documentation>
<purpose>.</purpose>
</documentation>
</argument>
<do>
{/metadocument}
*/
Function Diff($before, $after, &$difference)
{
$mode = (IsSet($difference->mode) ? $difference->mode : 'c');
switch($mode)
{
case 'c':
$lb = strlen($before);
$la = strlen($after);
break;
case 'w':
$before = $this->SplitString($before, " \t", "\r\n", $posb);
$lb = count($before);
$after = $this->SplitString($after, " \t", "\r\n", $posa);
$la = count($after);
break;
case 'l':
$before = $this->SplitString($before, "\r\n", '', $posb);
$lb = count($before);
$after = $this->SplitString($after, "\r\n", '', $posa);
$la = count($after);
break;
default:
$this->error = $mode.' is not a supported more for getting the text differences';
return false;
}
$diff = array();
for($b = $a = 0; $b < $lb && $a < $la;)
{
for($pb = $b; $a < $la && $pb < $lb && $after[$a] === $before[$pb]; ++$a, ++$pb);
if($pb !== $b)
{
$diff[] = array(
'change'=>'=',
'position'=>($mode === 'c' ? $b : $posb[$b]),
'length'=>($mode === 'c' ? $pb - $b : $posb[$pb] - $posb[$b])
);
$b = $pb;
}
if($b === $lb)
break;
for($pb = $b; $pb < $lb; ++$pb)
{
for($pa = $a ; $pa < $la && $after[$pa] !== $before[$pb]; ++$pa);
if($pa !== $la)
break;
}
if($pb !== $b)
{
$diff[] = array(
'change'=>'-',
'position'=>($mode === 'c' ? $b : $posb[$b]),
'length'=>($mode === 'c' ? $pb - $b : $posb[$pb] - $posb[$b])
);
$b = $pb;
}
if($pa !== $a)
{
$diff[] = array(
'change'=>'+',
'position'=>($mode === 'c' ? $a : $posa[$a]),
'length'=>($mode === 'c' ? $pa - $a : $posa[$pa] - $posa[$a])
);
$a = $pa;
}
}
if($a < $la)
{
$diff[] = array(
'change'=>'+',
'position'=>($mode === 'c' ? $a : $posa[$a]),
'length'=>($mode === 'c' ? $la - $a : $posa[$la] - $posa[$a])
);
}
$difference->difference = $diff;
return true;
}
/*
{metadocument}
</do>
</function>
{/metadocument}
*/
Function FormatDiffAsHtml($before, $after, &$difference)
{
if(!$this->diff($before, $after, $difference))
{
return false;
}
$html = '';
$insertedStyle = (strlen($this->insertedStyle) ? ' style="'.HtmlSpecialChars($this->insertedStyle).'"' : '');
$deletedStyle = (strlen($this->deletedStyle) ? ' style="'.HtmlSpecialChars($this->deletedStyle).'"' : '');
$td = count($difference->difference);
for($d = 0; $d < $td; ++$d)
{
$diff = $difference->difference[$d];
switch($diff['change'])
{
case '=':
$html .= nl2br(HtmlSpecialChars(substr($before, $diff['position'], $diff['length'])));
break;
case '-':
$html .= '<del'.$deletedStyle.'>'.nl2br(HtmlSpecialChars(substr($before, $diff['position'], $diff['length']))).'</del>';
break;
case '+':
$html .= '<ins'.$insertedStyle.'>'.nl2br(HtmlSpecialChars(substr($after, $diff['position'], $diff['length']))).'</ins>';
break;
default:
$this->error = $diff['change'].' is not an expected difference change type';
return false;
}
}
$difference->html = $html;
return true;
}
};
/*
{metadocument}
</class>
{/metadocument}
*/
?>
