I'm running a foreach loop on an array of students, that have a key ['all_user_grades']. What is the best way to count the number of As,Bs,Cs,Ds,Es and fails for each student in the array.
Here's what my array looks like:
[11] => Array
(
[id] => 10
[All_User_Grades] => A, A, D, A, E
)
Here's what my foreach looks like so far:
foreach($user_grades as $k => $v){
$aug = $v['All_User_Grades'];
$all_user_grades_arr = explode(',', $aug);
}
You can use the array_count_values() function:
$array = array('A', 'A', 'D', 'A', 'E');
$result = array_count_values($array);
print_r($result);
It outputs:
Array
(
[A] => 3
[D] => 1
[E] => 1
)
You can use substr_count() for this like so
$As = substr_count($aug, 'A');
$Bs = substr_count($aug, 'B');
//etc
or, just like you already did, explode and use the array for calculation
$all_user_grades_arr = explode(',', $aug);
$grades = array('A' => 0, 'B' => 0', ...);
foreach ($all_user_grades_arr as $val) {
$grades[ trim($val) ]++;
}
The trim() here is necessary to get rid of unnecessary whitespaces
You can try this way using array_count_values, i have used for single array, you change as per your requirements. See Demo http://ideone.com/YrGfPD
//PHP
$v=array('Id'=>10,'All_User_Grades'=>'A,A,D,A,E');
$aug = $v['All_User_Grades'];
$all_user_grades_arr = explode(',', $aug);
echo '<pre>';
print_r(array_count_values($all_user_grades_arr));
echo '</pre>';
//OUTPUT
Success time: 0.02 memory: 24448 signal:0
Array
(
[A] => 3
[D] => 1
[E] => 1
)
