Posted By

pitje on 09/02/07

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vali29

close tags in a html-snippet

/ Published in: PHP

suppose you have some html-formatted text of which you would like to show the first 45 characters. This function closes any tags that are not-closed because of cutting the first 45 characters.

Note that tags are also counted when defining the first 45 characters!

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<?php
 
function closetags ( $html )
{
    #put all opened tags into an array
    preg_match_all ( "#<([a-z]+)( .*)?(?!/)>#iU", $html, $result );
    $openedtags = $result[1];
 
    #put all closed tags into an array
    preg_match_all ( "#</([a-z]+)>#iU", $html, $result );
    $closedtags = $result[1];
    $len_opened = count ( $openedtags );
    # all tags are closed
    if( count ( $closedtags ) == $len_opened )
    {
        return $html;
    }
    $openedtags = array_reverse ( $openedtags );
    # close tags
    for( $i = 0; $i < $len_opened; $i++ )
    {
        if ( !in_array ( $openedtags[$i], $closedtags ) )
        {
            $html .= "</" . $openedtags[$i] . ">";
        }
        else
        {
            unset ( $closedtags[array_search ( $openedtags[$i], $closedtags)] );
        }
    }
    return $html;
}
 
$str  = "<div>This is some interesting <strong><em>content!</em> And this</strong> line is <em>";
$str .= "abundantly</em> formatted</div>";
 
$snippet = substr ( $str, 0, 45 );
 
$snippet = strrpos ( $snippet, "<" ) > strrpos ( $snippet, ">" ) ? rtrim ( substr ( $str, 0, strrpos ( $snippet, "<" ) ) ) . "....." : rtrim ( $snippet ) . ".....";
 
$x = closetags ( $snippet );
 
print htmlspecialchars ( $x );
 
?>

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Posted By: drb292 on December 4, 2008

This is a v handy script tho one issue is that it closes and , I've str_replace modded it but and works v well

Posted By: drb292 on December 4, 2008

spot the missing words: br tags and img tags

Posted By: pitje on March 2, 2009

yeah, it doesn't take into account any self-closing tag (like , and )

Posted By: pitje on March 2, 2009

ah, i meant like br, img and hr

Posted By: ellisgl on May 6, 2009

Here's a fix for the "H" tags.

put all opened tags into an array

pregmatchall('##iU', $html, $result);

put all closed tags into an array

pregmatchall('##iU', $html, $result);

Posted By: endiku on July 22, 2009

Fantastic bit of work. Was half way through my own project when I found this gem and its perfect.

To fix the BR, HR, IMG issue you can just use this extra line after the array_reverse

$openedtags = array_diff($openedtags, array("img", "hr", "br"));

That will remove those tags from the close creation.

Posted By: endiku on July 22, 2009

Correction. Add these lines

$openedtags = arraydiff($openedtags, array("img", "hr", "br")); $openedtags = arrayvalues($openedtags);

After

$openedtags = $result[1];

That will resort your array. The first way I mentioned will leave you with empty closing tags.

Posted By: webanol on September 14, 2009

I found another shortcoming on this script - if you truncated the html before sending it to this function, there's a decent chance you'll end up with a half-tag at the end, like:

<span

at the end instead of : <span>

To make this function account for that, put the following lines at the very beginning:

    # Strip any mangled tags off the end
    $html=preg_replace("#]*$#", " ", $html);

This goes before: pregmatchall ( "##iU", $html, $result );

This new code strips out the broken tag completely - there would be no intelligent way to restore it, as we wouldn't know what important info was lost with the truncation.

Great function, though! It was just what I needed for a project I'm working on currently.

Posted By: pitje on December 11, 2009

great, thanks! :)