I have an array which I want to sort on the basis of its specific key before running foreach loop I have tried ksort but It will not work on this sort of situation
[0]=>
  object(stdClass)#4829 (23) {
    ["ID"]=>
    string(4) "4089"
    ["post_author"]=>
    string(1) "1"
    ["post_date"]=>
    string(19) "2018-10-31 06:28:57"
    ["post_date_gmt"]=>
    string(19) "2018-10-31 06:28:57"
    ["post_content"]=>
    string(48) "Sessions move 1 hour earlier from 30th September"
    ["post_title"]=> 'test'
}
[1]=>
  object(stdClass)#4830 (24) {
    ["ID"]=>
    string(4) "4030"
    ["post_author"]=>
    string(1) "1"
    ["post_date"]=>
    string(19) "2018-10-31 06:28:57"
    ["post_date_gmt"]=>
    string(19) "2018-10-31 06:28:57"
    ["post_content"]=>
    string(48) "Sessions move 1 hour earlier from 30th September"
    ["post_title"]=> 'test'
}
This is the data I am fetching from my database and I want to show this in sorting order with respect to post_date. 
I need to sort this before running for each loop to show the courses
 
     
    