Iterate through multidimensional PHP array and output values - php

Question

I'm having a real headache trying to iterate through an array and output elements. Using the array structure below I want to be able to output each instance of partname.
The following loop outputs the first instance of partname. I can't seem to adapt it to loop through all instances within the array. I'm sure I'm missing something basic.
foreach($ItemsArray['assignments'] as $item) {
$partname = $item['grades'][0]['partname'];
}
Array
(
[assignments] => Array
(
[0] => Array
(
[assigntmentid] => 5101
[grades] => Array
(
[0] => Array
(
[id] => 5101
[name] => Advanced AutoCad
[partid] => 6601
[partname] => Draft
[userid] => 82069
[grade] => 53
[courseid] => 6265
[fullname] => Computer Aided Design
)
)
)
[1] => Array
(
[assigntmentid] => 5101
[grades] => Array
(
[0] => Array
(
[id] => 5101
[name] => Advanced AutoCad
[partid] => 6602
[partname] => Final
[userid] => 82069
[grade] => 35
[courseid] => 6265
[fullname] => Computer Aided Design
)
)
)
)
)

Answer 1

Instead of just coding by slapping the keyboard. Write down what your function needs to do. In english (or whatever language you prefer). This would be something like:
Foreach assignment, loop over all grades and store the partname of
that grade into an array.
And then code it:
function getPartnames($assignments) {
$partNames = array();
foreach ($assignments as $assignment) {
foreach($assignment['grades'] as $grade) {
$partNames[] = $grade['partname'];
}
}
return $partNames;
}
So what did I do? I simply translated english to code.
Some few more tips: Use variables names that make sense. $item; $ItemArray; ... don't make sense. They tell me nothing

Answer 2

use an extra foreach in your loop:
foreach($ItemsArray['assignments'] as $item) {
foreach($item['grades'] as $grade) {
echo $grade['partname'];
}
}