Question

I have the following array in php:

$a = [0, 4, 5, 7];

I would like to increment all the values without writing a loop (for, foreach…)

// increment all values
// $a is now array(1, 5, 6, 8)

Is it possible in php?

And by extention, is it possible to call a function on each element and replace that element by the return value of the function?

For example:

$a = doubleValues($a); // array(0, 8, 10, 14)

Answer 1

This is a job for array_map() (which will loop internally):

$a = array(0, 4, 5, 7);
// PHP 5.3+ anonmymous function.
$output = array_map(function($val) { return $val+1; }, $a);

print_r($output);
Array
(
    [0] => 1
    [1] => 5
    [2] => 6
    [3] => 8
)

Edit by OP:

function doubleValues($a) {
  return array_map(function($val) { return $val * 2; }, $a);
}