Code not returning expected results - php

Question

There is $sFactorGrades which I need to retrieve the 0th element from based on the GradeID and the CommutatorID, which is the 1st and 2nd element in the array respectively.
The GradeID and the CommutatorID is passed as parameters to the function.
The code that I have written is not returning the value which I know is present.
Any recommendations are welcome.
Here is my code:
function getMaximumSFactor($commuatorID, $gradeID) {
$sFactorGrades = populateSFactorGrades();
$arraySize = count($sFactorGrades);
for ($i = 0; $i < $arraySize; $i++) {
if (intval($sFactorGrades[i][1]) == $commuatorID && intval($sFactorGrades[i][2]) == $gradeID) {
return $sFactorGrades[i][0];
} else {
return 0;
}
}
}
Here is my data:
Array (
[0] => Array (
[0] => Maximum S Factor
[1] => Commutator ID
[2] => Grade ID
)
[1] => Array (
[0] => 0.6
[1] => 1
[2] => 2
)
[2] => Array (
[0] => 0.6
[1] => 1
[2] => 3
)
[3] => Array (
[0] => 0.6
[1] => 1
[2] => 4
)
)
Here is my result:
0

Answer 1

I suspect the reason for your loop always returning 0 is that you're passing i as the incrementing variable, and not the correct one: $i. Typos can be devastating... If it still doesn't work, feel free to update your post.
Edit: A tip is to insert this at the top of your page while in development stage:
ini_set('display_errors','On');
error_reporting(E_ALL);
In this case, it should give an undefined index error or similar.

Answer 2

The problem with your code is that you return too early. When your code encounters a return statement, it stops the iteration. You need to move the return statement outside the loop to prevent this from happening.
function getMaximumSFactor($commuatorID, $gradeID) {
$sFactorGrades = populateSFactorGrades();
$arraySize = count($sFactorGrades);
for ($i = 0; $i < $arraySize; $i++) {
if (intval($sFactorGrades[$i][1]) == $commuatorID &&
intval($sFactorGrades[$i][2]) == $gradeID) {
return $sFactorGrades[$i][0];
}
}
return 0;
}
If your code reached the last return, then it means that the if condition was never satisfied. For getMaximumSFactor (1, 2), this should return 0.2.
Demo

Answer 3

$sFactorGrades[i] need to be $sFactorGrades[$i].
Also it worth to use foreach() instead of normal for().
But thats not all. You need to check all values in array before returning result:
function getMaximumSFactor($commuatorID, $gradeID) {
$sFactorGrades = populateSFactorGrades();
foreach($sFactorGrades as $key=>$value){
if (intval($value[1]) == $commuatorID && intval($value[2]) == $gradeID) {
return $value[0];
}
}
return 0;
}