PHP Classes

PHP String Diff Class: Compare and find differences between two strings

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string-diff 1.0.0GNU Lesser Genera...3.0HTML, Algorithms, PHP 5, Text processing
Description 

Author

Philipp Strazny

This class can compare and find differences between two strings.

It takes two strings and split them into arrays so it can find the differences by compare the arrays. It supports comparing UTF-8 encoding strings.

The class can return a HTML string with <del> and <ins> tags to show what characters should be inserted or deleted to transform one string in the other.

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Example

<html>
<body>
<?php
include('StringDiff.php');
print StringDiff::getCSS();
$a = 'This is a string.';
$b = 'This would be another string.';
print '<table>';
print '<tr><td colspan=2>English characters:</td></tr>';
print '<tr><td>a:</td><td>'.$a.'</td></tr>';
print '<tr><td>b:</td><td>'.$b.'</td></tr>';
print '<tr><td>diff:</td><td>'.StringDiff::diff($a, $b).'</td></tr>';
print '<tr><td>overlap in a:</td><td>'.StringDiff::overlap($a, $b).'</td></tr>';
print '<tr><td>overlap in b:</td><td>'.StringDiff::overlap($b, $a).'</td></tr>';
print '<tr></tr>';
print '<tr><td colspan=2>Chinese characters:</td></tr>';
$a = '??????? ???????';
$b = '??????? ?????????';
print '<tr><td>a:</td><td>'.$a.'</td></tr>';
print '<tr><td>b:</td><td>'.$b.'</td></tr>';
print '<tr><td>diff:</td><td>'.StringDiff::diff($a, $b).'</td></tr>';
print '<tr><td>overlap in a:</td><td>'.StringDiff::overlap($a, $b).'</td></tr>';
print '<tr><td>overlap in b:</td><td>'.StringDiff::overlap($b, $a).'</td></tr>';
print '<tr></tr>';
print '<tr><td colspan=2>Russian characters:</td></tr>';
$a = '??????????? ???????? ???? ?? ??????????? ????????? ?????? ';
$b = '??????????? ??????? ???? ? ??????';
print '<tr><td>a:</td><td>'.$a.'</td></tr>';
print '<tr><td>b:</td><td>'.$b.'</td></tr>';
print '<tr><td>diff:</td><td>'.StringDiff::diff($a, $b).'</td></tr>';
print '<tr><td>overlap in a:</td><td>'.StringDiff::overlap($a, $b).'</td></tr>';
print '<tr><td>overlap in b:</td><td>'.StringDiff::overlap($b, $a).'</td></tr>';
print '<tr></tr>';
print '<tr><td colspan=2>Thai characters:</td></tr>';
$a = '?????????????? \'??????? ???.\' ????? \'?????????\' ???? \'???????\'';
$b = '?????????????? \'??????? .\' ????? \'?????????\' ???? \'??????????\'';
print '<tr><td>a:</td><td>'.$a.'</td></tr>';
print '<tr><td>b:</td><td>'.$b.'</td></tr>';
print '<tr><td>diff:</td><td>'.StringDiff::diff($a, $b).'</td></tr>';
print '<tr><td>overlap in a:</td><td>'.StringDiff::overlap($a, $b).'</td></tr>';
print '<tr><td>overlap in b:</td><td>'.StringDiff::overlap($b, $a).'</td></tr>';
print '</table>';


?>
</body>
</html>

  Files folder image Files (3)  
File Role Description
Plain text file StringDiff.php Class the StringDiff class; use StringDiff::diff or StringDiff::overlap methods
Accessible without login Plain text file StringDiffTest.php Test testing all relevant functionality
Accessible without login Plain text file example.php Example usage examples: English, Chinese, Russian, Thai characters

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