Here is the code I used in the "php code for latitue, longitude" origin section in the "Emplacement: Distance / Proximity field" views :
global $user;
global $databases;
$res = db_set_active('default');
$query1 = db_query("SELECT field_lien_adresse_utilisateur_target_id FROM
{field_data_field_lien_adresse_utilisateur} WHERE entity_id = :uid", array('uid' => $user->uid));
$results1 = $query1->fetchAll();
$query2 = db_query("SELECT field_adresse_utilisateur_lid FROM
{field_data_field_adresse_utilisateur} WHERE entity_id = :entity_id", array('entity_id' => $results1[0]->field_lien_adresse_utilisateur_target_id));
$results2 = $query2->fetchAll();
$query3 = db_query("SELECT latitude, longitude FROM {location} WHERE lid = :lid",
array('lid' => $results2[0]->field_adresse_utilisateur_lid));
$results3 = $query3->fetchAll();
$result['latitude'] = (float) $results3[0]->latitude;
$result['longitude'] = (float) $results3[0]->longitude;
return $result;
Then I got the latitude and longitude of the current user.
Hope it's useful.