rashid2538 / php-htmldiff

A library for comparing two HTML files/snippets and highlighting the differences using simple HTML.

Hi, I'm Rashid Mohamad 👋

I'm a full-stack developer with a passion for creating robust and scalable applications. I have experience working with a variety of programming languages including:

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php-htmldiff's Issues

Undefined offset error

The following code:

$diff = new HtmlDiff(
    'This is a demonstration restaurant.',
    'This is a demonstration restaurant'
);
$diff->build();

Triggers the following error:

Undefined offset: 0 in HtmlDiff.php on line 269

Problem when part of text in anchor is taken out of anchor tag

I took a quick look at your demo and tried a few different string changes and noticed the following issues:

1. When taking out text that was inside an anchor tag, the text that was taken out shows up in the compared html inside an anchor tag of its own rather than showing up with no anchor tag. For instance, when going from $html1 = Check <a href="http://google.com">this out</a>. to $html2 = Check <a href="http://google.com">this</a> out.
2. When putting text that was outside of an anchor into an anchor (the opposite to the above example), the text that is now inside the anchor still shows up outside the anchor in the comparison html.
3. Any change to the href or other attributes of an anchor is not indicated in any way in the comparison html. The most appropriate behavior would be to show the entire anchor element twice; first, the original anchor element inside a "del" tag, and second, the modified one inside an "ins" tag.

inefficient diff?

I run this on these two strings:

1. "Lot of words"
2. "not very many letters"

and I get the result:

Lotnot ofvery wordsmany letters

Instead of

Lot of wordsnot very many letters

Isn't this not very good?

Warning: count(): Parameter must be an array or an object that implements Countable .....

When running demo/index.php I see the following errors (multiple times):

Warning: count(): Parameter must be an array or an object that implements Countable in C:.....\vendor\php-htmldiff-master\HtmlDiff.php on line 360

Warning: count(): Parameter must be an array or an object that implements Countable in C:.....\vendor\php-htmldiff-master\HtmlDiff.php on line 266

wamp
PHP Version 7.3.12

Letters disappear, ins tag not closed

$a = new HtmlDiff('<p>1.1', 'test');
echo $a->build();

outputs:

<ins class='mod'><del class="diffmod">.1</del><ins class="diffmod">test</ins>

<p>1 is not shown as being removed, and the opening <ins class='mod'> tag is not closed.

License missing

What license is this code released under?

Accents

It is not working with accents.

When I enter the values below

from = Crédito
to = Créditos

I get the result

Créditoditos

Instead of
CréditoCréditos

Detect new links

Hello,
first of all, thank you for this library !
I tested some of the script, and it seems not to be able to detect the link addition, like

$old_text = ''Some text without link"
$new_text = "Some text with link"

it marks the change on WITHOUT to WITH, but not the new anchor tag to LINK word.

Would it be possible to detect new tags added ? maybe just add some special class to them not any INS and DELs, but simply add "class='diff' " or whatever to mark that this exact element is new ? That would be great help.

Thank you

Issues upgrading to PHP8

Migrating to PHP8 will cause a problem with the use of the class name "Match".
Recommend you change the three occurrences to "HtmlDiffMatch".

Line 342 changed to:
$matches[] = new HtmlDiffMatch( count( $this->oldWords ), count( $this->newWords ), 0 );

Line 360:

if( count( $match ) != 0 ) {
	$operations[] = new Operation( 'equal', $match->StartInOld, $match->EndInOld(), $match->StartInNew, $match->EndInNew() );
}

changed to

$operations[] = new Operation( 'equal', $match->StartInOld, $match->EndInOld(), $match->StartInNew, $match->EndInNew() );

Line 428 changed to:
return $bestMatchSize != 0 ? new HtmlDiffMatch( $bestMatchInOld, $bestMatchInNew, $bestMatchSize ) : null;

Line 432 changed to:
class HtmlDiffMatch {

Special character problem

Hi,

I like you class, but I had a problem with german characters like ä, ü, ö.

Solution for me is, to replace the Explode funtion with the following code:

private function Explode( $value ) {
return preg_split('//u', $value);
}

That splits a string using UTF8 encoding.

A bug in InsertTag function.

In function InsertTag, here at line: if( preg_match( $words[ 0 ], $x ) ).

I think it should be preg_match( $words[ 0 ], $x ) => preg_match( $x, $words[ 0 ] ).

Project status

As title, this project has been inactive for about whiles.

And it also has the forked version of caxy/php-htmldiff.

Should I need to migrate to this forked one?