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In response to ' Only one [code ] meta-tag allowed' (bug #621992) I modified COM_checkHTML to allow multiple [code ] blocks in a post. I've shown my code below. You can also see it in action in my story about the mod.

/**
* Makes an ID based on current date/time
*
* This function COM_creates a 17 digit sid for stories based on the 14 digit date
* and a 3 digit random number that was seeded with the number of microseconds
* (.000001th of a second) since the last full second. NOTE: this is now used for more than
* just stories!
*
* 10/13/2002 4:19AM jim AT jimweller.net added handling for mulitple  meta-tags
*
* @return	string	$sid  Story ID
*
*/

function COM_checkHTML( $str ) 
{
    global $_CONF;
	
    $str = stripslashes($str);

    // Get rid of any newline characters
    $str = preg_replace( "/\n/", '', $str );
    
    // Replace any $ with $ (HTML equiv)
    $str = str_replace( '$', '$', $str );
    
   

    // loop through consecutive  meta tags
    $start_pos = strpos( strtolower( $str ), '' );
    $end_pos = 0;
    while ( ! ( $start_pos === false ) )
    {
        $end_pos = strpos( strtolower( $str ), '

', $end_pos ); $end_pos += 7; // to account for the length of the tag $orig_pre_string = substr( $str, $start_pos, $end_pos - $start_pos ); $new_pre_string = str_replace( '', '', $orig_pre_string ); $new_pre_string = str_replace( '', '>', $new_pre_string ); $new_pre_string = str_replace( '

', '', $new_pre_string );
        $new_pre_string = str_replace( '
', '', $new_pre_string );
        $new_pre_string = str_replace( '</code></pre>', '', $new_pre_string );
        $new_pre_string = str_replace( '
', '', $new_pre_string );
        $new_pre_string = nl2br( $new_pre_string );
        $str = str_replace( $orig_pre_string, '
' . $new_pre_string . '
', $str );
        $start_pos = strpos( strtolower( $str ), '
', $end_pos );
    } // ends while loop

    if( !SEC_hasRights( 'story.edit' ) || empty ( $_CONF['adminhtml'] ))
    {
        $str = strip_tags( $str, $_CONF['allowablehtml'] );
    }
    else
    {
        $str = strip_tags( $str, $_CONF['adminhtml'] );
    }

    return COM_killJS( $str );
}