Question

$city = $_GET['cityselect'];
add_query_arg( array ( 'city' => $city, 'key' => 'value' );

Basically i want to check if $city exists and if not i want to remove both key and value, ie 'city' => $city, (comma included). So the output would be:

add_query_arg( array ( 'key' => 'value' );

Any idea?

Answer 1

Only add the city key if it is set, like this:

$arg = array( 'key' => 'value');

if( isset( $_GET['cityselect'])) 
    $arg['city'] = $_GET['cityselect'];

add_query_arg( $arg);