Posted By

pitje on 09/02/07

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Last Edited at 09/02/07 08:15am

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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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