Check for presence of URL parameter condition for Oxygen

urlparamexistscondition

if( function_exists('oxygen_vsb_register_condition') ) {

global $oxy_condition_operators;

// Condition to check if a URL parameter is present.
oxygen_vsb_register_condition('URL Param Exists', array('options'=>array(), 'custom'=>true), array('--'), 'oxy_url_param_exists_callback', 'Other');

function oxy_url_param_exists_callback($value, $operator) {

if( isset($_GET[$value]) && $_GET[$value] ) {
  return true;
  } else {
  return false;
}
	
}
	
// Condition to check if a URL parameter is NOT present.
oxygen_vsb_register_condition('URL Param Does Not Exist', array('options'=>array(), 'custom'=>true), array('--'), 'oxy_url_param_not_exists_callback', 'Other');

function oxy_url_param_not_exists_callback($value, $operator) {

if( isset($_GET[$value]) && $_GET[$value] ) {
  return false;
  } else {
  return true;
}
	
}

}

For anyone who needs to check for a key equals value condition here is a useful helper function which you can add into your snippets and then use it with oxygen -> dynamic data -> php return value

function url_param_key_equals_value($key, $value)
{
	foreach($_GET as $keyObj => $valueObj)
		{  
			if($keyObj == $key) {
				if($valueObj == $value) {
					return 'true';
				}
			}
		}
    return 'false';
}