You may convert your anonymous function into a closure with the use
keyword. Pass in a string variable for the value you want to match.
// Array of strings to match and use as output keys
$keys = array('Insulin','TZD','SGLT-2');
// Output array
$result = array();
// Loop over array of keys and call the count(array_filter())
// returning the result to $result[$key]
foreach ($keys as $key) {
// Pass $key to the closure
$result[$key] = count(array_filter($data,function ($entry) use ($key) {
return ($entry['choice'] == $key);
}));
}
Converting your var_dump()
to an array and running this against it, the output is:
Array
(
[Insulin] => 2
[TZD] => 0
[SGLT-2] => 0
)
You can simplify it with array_count_values()
as well:
$result2 = array_count_values(array_map(function($d) {
return $d['choice'];
}, $data));
print_r($result2);
Array
(
[Insulin] => 2
)
If you need zero counts for the missing ones, you may use array_merge()
:
// Start with an array of zeroed values
$desired = array('Insulin'=>0, 'TZD'=>0, 'SGLT-2'=>0);
// Merge it with the results from above
print_r(array_merge($desired, $result2));
Array
(
[Insulin] => 2
[TZD] => 0
[SGLT-2] => 0
)