Use php to compare differences in text content

This class can be used to find and view the differences between text strings. It has two text strings and the difference algorithm used to identify the differences between them, and returns a list change to fix the original string as the final string. PHP source code and Demonstration: source code demonstration? Php ** from: www.codepearl.com * require (

This class can be used to find and view the differences between text strings. It has two text strings and the difference algorithm used to identify the differences between them, and returns a list change to fix the original string as the final string. PHP source code and Demonstration: source code demonstration? Php/** from: http://www.codepearl.com */require (

This class can be used to find and view the differences between text strings.

It has two text strings and the difference algorithm used to identify the differences between them, and returns a list change to fix the original string as the final string. PHP

Source code and demo:Source code source demonstration Source

 Test the Diff Object
 

 
 
  
   http://www.codepearl.com
  
  
   @(#) $Id: diff.php,v 1.4 2013/11/06 21:19:07 mlemos Exp $
  
  
   Copyright ?(C) http://www.codepearl.com
  
  OAuth clientManuel Lemoshttp://www.codepearl.com
  
   
    en
   
   
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  {/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}
  
   
    Diff
   
   
    BOOLEAN
   
   
    
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    before
   
   
    STRING
   
   
    
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    after
   
   
    STRING
   
   
    
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    difference
   
   
    HASH
   
   
   
    
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    {/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}
   
  {/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 .= '
  
   '.nl2br(HtmlSpecialChars(substr($before, $diff['position'], $diff['length']))).'';break;case '+':$html .= '
   
    '.nl2br(HtmlSpecialChars(substr($after, $diff['position'], $diff['length']))).'';break;default:$this->error = $diff['change'].' is not an expected difference change type';return false;}}$difference->html = $html;return true;}};/*{metadocument}
   
  
 {/metadocument}*/?>