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<?
/*
*---------------------------------------------------------------------------------------------------
* UTILITY DESCRIPTION
*---------------------------------------------------------------------------------------------------
* File Name: ContentDiff.class.php
* Class Name: ContentDiff()
* Class Description: This text utility will allow user to pass two slightly changed texts and
* will display block of text with the differences in this text.
* For example:
* OLD TEXT: This is a OLD text.
* Check the result.
*
* NEW TEXT: This is a NEW text.
* Check the result.
*
* OUTPUT: This is a OLD text. -- by default text will be red color
* with the line through it
*
* This is a NEW text. -- by default text will be blue color
*
* Check the result. -- text will be regular since it's unchaged
*
* Version: 0.1
* BY: Val Vinder, Nick Ferguson
* Date: 07.01.2004
* Email: valera_la@hotmail.com
*
*---------------------------------------------------------------------------------------------------
* UTILITY LIMITATION
*---------------------------------------------------------------------------------------------------
* ! class only checks difference in lines and not separate words. May bee in the next version :)
*
*---------------------------------------------------------------------------------------------------
* UTILITY LICENSE
*---------------------------------------------------------------------------------------------------
* GPL license. Feel Free to use it. If you will enchance the script share it.
*---------------------------------------------------------------------------------------------------
* CLASS VARIABLES
*---------------------------------------------------------------------------------------------------
* $fileOld="temp/old_"; --------- location of the temparary stored old files ( i used temp dir)
* $fileNew="temp/new_"; --------- location of the temparary stored new files ( i used temp dir)
* $handleOld; --------- file handle for Old Files
* $handleNew; --------- file handle for New Files
*
* $styleOld=' style="text-decoration: line-through;color:red;" ';
* ----------for convinience default decoration is assigned
* it's used for displaying changed old content
*
* $styleNew=' style="color:blue;" ';
* ----------for convinience default decoration is assigned
* it's used for displaying changed old content
*
* $oldContentTEXT; ----------place holder for oldContent
* $newContentTEXT; ----------place holder for newContent
* $newText=""; ----------place holder for the output
*
**---------------------------------------------------------------------------------------------------
* CLASS METHODS
*---------------------------------------------------------------------------------------------------
* function contentDiff($oldContent, $newContent, $styleOld="",$styleNew="") --constructor
* function showDifference() -- main method, that perform actual comparison
* function isOldContent() -- perform check for an old Content, check if it's empty
* function writeContentToFile($oldContent,$newContent) -- write content to the files and stores
* those files in the assigned temp dir
* function mergeTwoFiles() -- perform merge of the two files by using unix diff command with some
* options in order to display color difference
* function convertToText($lineArray) -- converts file lines array to the text delimited by n
* function deleteFiles() -- method that deletes two temp files
*---------------------------------------------------------------------------------------------------
* CLASS CONSTRUCTOR
*---------------------------------------------------------------------------------------------------
*
* Perfomed action:
*
* 1.set up file names
* 2.create file handels
* 3.check styles for displaying the text
* 4.setting up old and new content
*
* Passed parameters:-------
*
* $oldContent ----------place holder for an old text
* $newContent ----------place holder for a new text
* $styleOld ----------place holder for the old style (i.e. css class name, class="old")
* $styleNew ----------place holder for the new style (i.e. css class name, class="new")
*-------------------------------------------------------------------------------------------------------------
* CLASS USAGE
*-------------------------------------------------------------------------------------------------------------
*
*
*-------------------------------------------------------------------------------------------------------------
*/
class ContentDiff
{
var $fileOld="temp/";
var $fileNew="temp/";
var $handleOld;
var $handleNew;
var $styleOld=' style="text-decoration: line-through;color:red;" '; //for convinience default decoration is assigned
var $styleNew=' style="color:blue;" '; //for convinience default decoration is assigned
var $oldContentTEXT; //place holder for oldContent
var $newContentTEXT; //place holder for newContent
var $newText="";
/*
* Constructor will accept four parameters
* $oldContent ------------- place holder for an old text
* $newContent ------------- place holder for a new text
* $styleOld ------------- place holder for the old style (i.e. css class name, class="oold")
* $styleNew ------------- place holder for the new style (i.e. css class name, class="new")
*/
function ContentDiff($oldContent, $newContent, $styleOld="",$styleNew="")
{
$this->fileOld=$this->fileOld."old_".rand() ;
$this->fileNew=$this->fileNew."new_".rand();
$this->handleOld = fopen($this->fileOld,'w');
$this->handleNew = fopen($this->fileNew,'w');
if (!empty($styleOld))
$this->styleOld = $styleOld;
if (!empty($styleNew))
$this->styleNew = $styleNew;
$this->oldContentTEXT = $oldContent;
$this->newContentTEXT = $newContent;
}
function showDifference()
{
$success = false;
if (!$this->isOldContent())
return true;
if ($this->oldContentTEXT==$this->newContentTEXT)
{
$this->newText = $this->newContentTEXT;
return true;
}
if ($this->writeContentToFile($this->oldContentTEXT,$this->newContentTEXT))
$success = true;
$mergedLines = $this->mergeTwoFiles();
$this->deleteFiles();
if($this->convertToText($mergedLines))
$success = true;
return $success;
}
function isOldContent()
{
if (!empty($this->oldContentTEXT))
return true;
else
return false;
}
function writeContentToFile($oldContent,$newContent)
{
$success = true;
if (fwrite($this->handleOld, $oldContent ) === FALSE) {
$this->messages[] = array("error"=>true,"message"=>"Cannot write old content to the file for merging",);
$success = false;
}
if (fwrite($this->handleNew, $newContent ) === FALSE) {
$this->messages[] = array("error"=>true,"message"=>"Cannot write new content to file for merging",);
$success = false;
}
fclose($this->handleOld);
fclose($this->handleNew);
return $success;
}
function mergeTwoFiles()
{
//diff options
$diffOpts .= " -aBbHiws --minimal --ignore-blank-lines --ignore-space-change ";
$diffOpts .= "--new-line-format='<font ".$this->styleNew.">%l</font>n' ";
$diffOpts .= "--old-line-format='<font ".$this->styleOld.">%l</font>n' ";
exec("diff ". $diffOpts.$this->fileOld." ".$this->fileNew." 2>&1",$report,$return_val);
return $report;
}
function convertToText($lineArray)
{
$newText="";
foreach($lineArray as $line)
$newText.=$line."n";
$this->newText = $newText;
if (!empty($this->newText))
return true;
else
return false;
}
function deleteFiles()
{
unlink($this->fileOld);
unlink($this->fileNew);
}
}
//end of class
?>
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Usage Example
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require_once("classes/ContentDiff.class.php");
$text1 = "This is a test";
$text2 = "This is a second test";
$diff = new ContentDiff($text1,$text2);
if($diff->showDifference())
{
print $diff->newText;
}
else
{
print $diff->messages;
}
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