- define: documentation ( source)
<?php
define("VENUESITE_DEFAULT", 'https://www.');
$post_array = array();
$post_array['venueSite'] = VENUESITE_DEFAULT;
echo $post_array['venueSite'];
$post_array['venueSite'] = $post_array['venueSite']==VENUSITE_DEFAULT?'':$post_array['venueSite'];
echo $post_array['venueSite'];
?>