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)
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);
}
Yeah this is possible using the PHP function array_map() as mentioned in the other answers.This solutions are completely right und useful. But you should consider, that a simple foreach loop will be faster and less memory intense. Furthermore it grants a better readability for other programmers and users. Nearly everyone knows, what a foreach loop is doing and how it works, but most PHP users are not common with the array_map() function.
$arr = array(0, 4, 5, 7);
function val($val) { return $val+1; }
$arr = array_map( 'val' , $arr );
print_r( $arr );
See it here
array_walk(). But that's still a loop internally, even if you don't note thefororforeachyourself.