从多维数组Wordpress获取值

I've this array :

$args = array(
    'tax_query' => array(
        array(
            'taxonomy' => 'agence',
            'field' => 'slug',
            'terms' => array( 'dinan')
            )
        )
    ); 

I want to pick the value 'dinan' from this array, Thanks for the reply !

The way to pick from that array:

$tmp = $args['tax_query']['terms'][0];