I have an array of subarrays in the following format

Array
(
    [0] => Array
        (
            [unit_id] => 6504
            [assignment_name] => Grade assignment 
            [assignment_description] => 
            [assignment_total_score] => 10
            [unit_type_name] => Homework
            [is_graded] => 1
            [standard_id] => 1219
            [scoring_type] => score
            [attempt_score] => 8
            [unit_duedate] => 2016-02-10 09:00:00
            [standard] => Array
                (

                    [0] => stdClass Object
                        (
                            [unit_id] => 6504
                            [is_formal] => 1
                            [assignment_name] => Grade assignment 
                            [assignment_description] => 
                            [standard_id] => 1220
                            [standard_name] => 9-10.RL.3
                            [standard_description] => Analyze how complex characters (e.g., those with multiple or conflicting motivations) develop over the course of a 
                        )

                )

        )

    [1] => Array
        (
            [unit_id] => 8584
            [assignment_name] => Sine and Cosecant Graphs
            [assignment_description] => Define the sine and cosecant graphs using a unit circle
            [assignment_total_score] => 15
            [unit_type_name] => Paper
            [scoring_type] => score
            [attempt_score] => 0
            [unit_duedate] => 2016-04-29 09:00:00
            [standard] => Array
                (

                    [0] => stdClass Object
                        (
                            [unit_id] => 8584
                            [is_formal] => 1
                            [assignment_name] => Sine and Cosecant Graphs
                            [assignment_description] => Define the sine and cosecant graphs using a unit circle
                            [assignment_total_score] => 15
                            [standard_id] => 82790
                            [standard_name] => 9-10.RL.7


                )

        )

    [2] => Array
        (
            [unit_id] => 11611
            [assignment_name] => Adding 5 + 3 + 6
            [assignment_description] => 
            [assignment_total_score] => 10
            [unit_type_name] => Homework
            [standard_id] => 82772
            [scoring_type] => score
            [attempt_score] => 0
            [unit_duedate] => 2016-08-23 19:00:00
            [standard] => Array
                (
                    [0] => stdClass Object
                        (
                            [unit_id] => 11611
                            [is_formal] => 1
                            [assignment_name] => Adding 5 + 3 + 6
                            [assignment_description] => 
                            [assignment_total_score] => 10
                            [standard_id] => 82772
                            [standard_name] => 9-10.RL.1

                        )

                )

        )

)
unit_type_name
unit_type_name