Foreach array organization/iteration - php

Question

I have this array that I've tried iterating over and creating a new array:
array(233) {
[0]=>
array(2) {
["subject_id"]=>
int(138)
["relatedsubject_id"]=>
int(127)
}
[1]=>
array(2) {
["subject_id"]=>
int(138)
["relatedsubject_id"]=>
int(47)
}
[2]=>
array(2) {
["subject_id"]=>
int(138)
["relatedsubject_id"]=>
int(13)
}
[3]=>
array(2) {
["subject_id"]=>
int(138)
["relatedsubject_id"]=>
int(56)
}
[4]=>
array(2) {
["subject_id"]=>
int(154)
["relatedsubject_id"]=>
int(77)
}
[5]=>
array(2) {
["subject_id"]=>
int(154)
["relatedsubject_id"]=>
int(69)
}
[6]=>
array(2) {
["subject_id"]=>
int(154)
["relatedsubject_id"]=>
int(70)
}
[7]=>
array(2) {
["subject_id"]=>
int(154)
["relatedsubject_id"]=>
int(75)
I cut it short so it's not too obnoxious. This is the code I'm using now:
$subject_id = array();
foreach ($results as $mainKey => $subArrays) {
if(!isset($subject_id[$results[$mainKey]["subject_id"]])) {
$subject_id[$results[$mainKey]["subject_id"]] = array();
array_push($subject_id[$results[$mainKey]["subject_id"]], $results[$mainKey]["relatedsubject_id"]);
// $subject_id[$results[$mainKey]["subject_id"]][] = $results[$mainKey]["relatedsubject_id"];
}
}
var_dump($subject_id);
My results look like this:
array(111) {
[138]=>
array(1) {
[0]=>
int(127)
}
[154]=>
array(1) {
[0]=>
int(77)
}
Any ideas on why I'm only getting 1 value and how to modify to get each "relatedsubject_id" to fall in line with the corresponding "subject_id"? Thank you.
Edit
Expected Result:
array {
[138]=>
array(1) {
[0]=>
int(127)
[1]=>
int(47)
[2]=>
int(13)
[3]=>
int(56)
}
[154]=>
array(1) {
[0]=>
int(77)
[1]=>
int(69)
[2]=>
int(70)
[3]=>
int(75)
}

Answer 1

It seems you are trying to consolidate your subject ids and relatedsubject_ids. If thats the case, this may work for you.
$subject_id = array();
foreach ($results as $mainKey => $subArrays) {
if(!isset($subject_id[$results[$mainKey]['subject_id']])) {
$subject_id[$results[$mainKey]['subject_id']] = array('subject_id' => $results[$mainKey]['subject_id'], 'relatedsubject_id' => array());
}
$subject_id[$results[$mainKey]['subject_id']]['relatedsubject_id'][] = $results[$mainKey]["relatedsubject_id"];
}
Changed to your EDIT
$subject_id = array();
foreach ($results as $mainKey => $subArrays) {
if(!isset($subject_id[$results[$mainKey]['subject_id']])) {
$subject_id[$results[$mainKey]['subject_id']] = array();
}
$subject_id[$results[$mainKey]['subject_id']][] = $results[$mainKey]["relatedsubject_id"];
}
The reason why you were only getting one result is you had all your code in the if(!isset()) function. That should only not be set once. If that makes sense.