<?php
$array = array(0, 1, 2, 3, 4, 5);
foreach ($array as $item) {
$item *= 2;
}
var_dump($array);
?>
I thought I could add & just like in C, but that doesn’t seem to work.
Returns: 0, 1, 2, 3, 4, 5.
Expected: 0, 2, 4, 6, 8, 10.
Is there a real way in PHP, without going array[0] through array[5]?
Something like?
<?php
$array = array(0, 1, 2, 3, 4, 5);
foreach ($array as $key => $value) {
$array[$key] = $value * 2;
}
var_dump($array);
?>
I had that kind of in mind, but it will get extremely complicated with my situation (multiple levels what not).
Is there no referencing possibility in PHP?
Maybe this?
foreach ($array as &$item) works as expected. but that has nothing to do with reducing your loop. and i don’t see anything coplicated with using the key.
Keep in mind: there are no pointers in PHP, only references. Using the & symbol in front of a variable will tell PHP it should be passed as a reference.
In my opinion, the cleanest way to do this is using the array_map function, like @SamA74 pointed out.
How would that look?
<?php
function double($n) { return ($n * 2) ; }
$array = array(0, 1, 2, 3, 4, 5);
$array = array_map("double", $array) ;
var_dump($array);
?>
That’s a possible way, but I prefer the more shorthand method.
<?php
$values = [0, 1, 2, 3, 4];
$doubleValues = array_map(function ($value) {
return $value * 2;
}, $values);
The upside of your example would be that the double function can be reused. I suppose however that’s just a dummy example.
Edit - a few code style tips:
[ ] as a shorthand for array().?> php tag in .php files. It’s actually recommended not to use it to avoid unforseen results, because things after the closing tag could mess stuff up.This topic was automatically closed 91 days after the last reply. New replies are no longer allowed.