PHP Functional Programming Common functional methods in PHP
Example
Mapping
Applying a function to all elements of an array :
array_map('strtoupper', $array);
Be aware that this is the only method of the list where the callback comes first.
Reducing (or folding)
Reducing an array to a single value :
$sum = array_reduce($numbers, function ($carry, $number) {
return $carry + $number;
});
Filtering
Returns only the array items for which the callback returns true :
$onlyEven = array_filter($numbers, function ($number) {
return ($number % 2) === 0;
});
