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16 changes: 8 additions & 8 deletions lib/Segment.php
Original file line number Diff line number Diff line change
Expand Up @@ -52,8 +52,8 @@ public static function identify(array $message) {
*/
public static function group(array $message) {
self::checkClient();
$groupId = !empty($message["groupId"]);
self::assert($groupId, "Segment::group() expects groupId");
$groupId = !empty($message['groupId']);
self::assert($groupId, "Segment::group() expects a groupId");
self::validate($message, "group");

return self::$client->group($message);
Expand Down Expand Up @@ -93,8 +93,8 @@ public static function screen(array $message) {
*/
public static function alias(array $message) {
self::checkClient();
$userId = !empty($message["userId"]);
$previousId = !empty($message["previousId"]);
$userId = (array_key_exists('userId', $message) && strlen((string) $message['userId']) > 0);
$previousId = (array_key_exists('previousId', $message) && strlen((string) $message['previousId']) > 0);
self::assert($userId && $previousId, "Segment::alias() requires both userId and previousId");

return self::$client->alias($message);
Expand All @@ -103,12 +103,12 @@ public static function alias(array $message) {
/**
* Validate common properties.
*
* @param array $msg
* @param array $message
* @param string $type
*/
public static function validate($msg, $type){
$userId = !empty($msg["userId"]);
$anonId = !empty($msg["anonymousId"]);
public static function validate($message, $type){
$userId = (array_key_exists('userId', $message) && strlen((string) $message['userId']) > 0);
$anonId = !empty($message['anonymousId']);
self::assert($userId || $anonId, "Segment::${type}() requires userId or anonymousId");
}

Expand Down