[Snippet] TV Conditional

/**
 * Template Variable Conditional
 * Created by Mark Kaplan on 26-Feb-2006
 * Used for showing chunks depending on a template variable
 * Call like so:
 * 
 * [!tvcnd? &tv=`TV name` &cnd=`value, mode` &rtn=`name of chunk to return`!]
 * 
 * Mode can either be 1 or  2. Mode 1 shows the chunk if the tv's value is not equal to the conditional and mode 2 shows if the tv's value equals the conditional. [2]
 */

$tv = isset( $tv ) ? $tv : "";
 // get tv name
$cnd = isset( $cnd )? $cnd: "";
 // get conditional
$rtn = isset( $rtn )? $modx -> getChunk( $rtn ): "";
 // get chunk to return
$id = isset( $id )? $id: $modx -> documentObject['id'];
 // get current page ID
$tvarray = $modx -> getTemplateVarOutput( $tv, $id, $published = 1 );
 $cnd = explode( ',', $cnd );
 $value = $cnd[0];
 $filtertype = isset( $cnd[1] ) ? $cnd[1] : 2;
 if ( $filtertype == 1 && ( !isset ( $tvarray[$tv] ) || $tvarray[$tv] != $value ) ) {
     return $rtn;
      } else if ( $filtertype == 2 && $tvarray[$tv] == $value ) {
     return $rtn;
      }