array中按照key排序的问题?

$test=array(60) {
 [0]=> object(stdClass)#14 (3) { ["id"]=> string(3) "609" ["title"]=> string(19) "Physical Mechanisms" ["publish_time"]=> string(10) "6 MAY 2016" }
 [1]=> object(stdClass)#14 (3) { ["id"]=> string(3) "610" ["title"]=> string(20) "Engineering Substrate" ["publish_time"]=> string(10) "2 MAY 2016" }
  ...}
 

根据publish_time对$test进行排序,怎么做?请教!

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