How to create an array under an alreay present key in PHP? - php

Question

I've a following array titled $grid_data as follows:
Array
(
[0] => Array
(
[question_id] => 50147
[question_parent_id] => 0
[question_subject_id] => 4
[question_topic_id] => 219
[question_directions] =>
[question_text] => A wooden scale of length L and mass M is lying on a frictionless table. A particle of mass m moving the velocity v, at a distanced from the centre as shown in Fig. 93 strikes the scale and adherses to it. Which of the follwoing quantity (quantities) is (are) conserved for the system.
[question_solution] =>
[question_file] =>
[question_description] =>
[question_difficulty_type] => 2
[question_has_sub_ques] => 0
[question_picked_individually] => no
[question_appeared_count] => 0
[question_manual] => 0
[question_has_solution] => 0
[question_site_id] =>
[question_created_staff_id] => 4e4078987c90dbf4ee477f480ad1b874
[question_added_date] => 1329728799
[question_updated_staff_id] => 1096ab29ecde5cec198bb2ebe730d229
[question_updated_date] => 1340253386
[que_issue_id] => 1
[reported_site_id] => ENTPRM
[reported_user_type] => student
[reported_user_id] => 395599c5891c1418357e2efa89bc3e27
[que_issue] => Question is wrong,Other
[que_issue_comment] => Happy question
[que_issue_status] => 0
[que_issue_date] => 1394517725
[que_issue_fixed_date] => 0
[question_lock] => 1
[ques_ans] => Array
(
[0] => Array
(
[answer_id] => 198739
[answer_question_id] => 50147
[answer_text] => linear momentum only
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
[1] => Array
(
[answer_id] => 198740
[answer_question_id] => 50147
[answer_text] => angular momentum only
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
[2] => Array
(
[answer_id] => 198741
[answer_question_id] => 50147
[answer_text] => kinetic energy only
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
[3] => Array
(
[answer_id] => 198742
[answer_question_id] => 50147
[answer_text] => linear momentum and angular momentum both
[answer_file] =>
[answer_description] =>
[answer_is_right] => 1
)
)
)
[1] => Array
(
[question_id] => 21679
[question_parent_id] => 0
[question_subject_id] => 5
[question_topic_id] => 285
[question_directions] =>
[question_text] => In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is �math xmlns=�http://www.w3.org/1998/Math/MathML���mn�5�/mn��mo��nbsp;�/mo��mi��#937;�/mi��/math�. The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3mm. Now the total resistance of the cable will be
[question_solution] =>
[question_file] =>
[question_description] =>
[question_difficulty_type] => 2
[question_has_sub_ques] => 0
[question_picked_individually] => no
[question_appeared_count] => 0
[question_manual] => 0
[question_has_solution] => 0
[question_site_id] =>
[question_created_staff_id] => fbfee12504bf3c4a038d4c9f142f894e
[question_added_date] => 1326440661
[question_updated_staff_id] => 1096ab29ecde5cec198bb2ebe730d229
[question_updated_date] => 1338368619
[que_issue_id] => 2
[reported_site_id] => ENTPRM
[reported_user_type] => staff
[reported_user_id] => ff8d4a5ea6bf11dce105aa2fa7b959b8
[que_issue] => Question is Incomplete/Wrong,Directions Missing
[que_issue_comment] =>
[que_issue_status] => 0
[que_issue_date] => 1395655234
[que_issue_fixed_date] => 0
[question_lock] => 1
[ques_ans] => Array
(
[0] => Array
(
[answer_id] => 573122
[answer_question_id] => 21679
[answer_text] => «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»7«/mn»«mo».«/mo»«mn»5«/mn»«mo»§nbsp;«/mo»«mi»§#937;«/mi»«/math»
[answer_file] =>
[answer_description] =>
[answer_is_right] => 1
)
[1] => Array
(
[answer_id] => 573123
[answer_question_id] => 21679
[answer_text] => «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»45«/mn»«mo»§nbsp;«/mo»«mi»§#937;«/mi»«/math»
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
[2] => Array
(
[answer_id] => 573124
[answer_question_id] => 21679
[answer_text] => «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»90«/mn»«mo»§nbsp;«/mo»«mi»§#937;«/mi»«/math»
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
[3] => Array
(
[answer_id] => 573125
[answer_question_id] => 21679
[answer_text] => «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»270«/mn»«mo»§nbsp;«/mo»«mi»§#937;«/mi»«/math»
[answer_file] =>
[answer_description] =>
[answer_is_right] => 0
)
)
)
)
Now ignore rest of the array and concentrate only on two key elements from the above array which are as follows:
[que_issue] => Question is wrong,Other //From first array
[que_issue] => Question is Incomplete/Wrong,Directions Missing //From second array
Actually I want to convert this comma separated strin into an array under the key [que_issue] for every array element present in an array. I want the output in following manner in above array($grid_data):
/*Oputput for first array element from array `$grid_data`*/
[que_issue] => Array(
[0] => Question is wrong
[1] =>Other
)
/*Oputput for second array element from array `$grid_data`*/
[que_issue] => Array(
[0] => Question is Incomplete/Wrong
[1] => Directions Missing
)
Now can anyone help me in manipulating the array $grid_data in order to have the above output for each array element present in it? Thanks in advance.

Answer 1

Easy enough to foreach and explode:
foreach($grid_data as &$array) {
$array['que_issue'] = explode(',', $array['que_issue']);
}
Or:
foreach($grid_data as $key => $array) {
$grid_data[$key]['que_issue'] = explode(',', $array['que_issue']);
}

Answer 2

Without using reference:
for($i = 0; $i < count($grid_data); $i++) {
$grid_data[$i]['que_issue'] = explode(',', $grid_data[$i]['que_issue']);
}
or foreach() using $key