Add To Array Value

Question

this must be very simple but I couldn't make it work.. PHP noob :P

I have this array "$e_cats" and when I do var_dump($e_cats); the result is this:

array(3) { [0]=> string(3) "192" [1]=> string(3) "190" [2]=> string(3) "191" }

What I want is to add "-" to every value inside, so "-192", "-190", and "-191". Here is my code:

foreach ($e_cats as $cat) {
    $cat = '-' .$cat;
}

but when I do print_r($cat) the result is: -191 (not all values). What did I do wrong?

Thanks in advance

use foreach ($e_cats as &$cat) instead of foreach ($e_cats as $cat). — HamZa
– HamZa, Commented Jun 19, 2013 at 22:20
HamZa, thanks mate, but it doesn't work. foreach ($e_cats as &$cat) { $cat = '-' .$cat; } print_r($cat); result = -191 — Mario88
– Mario88, Commented Jun 19, 2013 at 22:22
Look over the part near the top of the foreach docs about modifying array elements by reference. — Michael Berkowski
– Michael Berkowski, Commented Jun 19, 2013 at 22:22
Unless you really need these as strings, PHP will cast them to ints so you can just do $cat = -$cat; !! — Michael Berkowski
– Michael Berkowski, Commented Jun 19, 2013 at 22:26

jterry · Accepted Answer · 2013-06-19 22:22:08Z

1

foreach($e_cats as $i => $cat) {
    $e_cats[$i] = '-' . $cat;
}

You were close!

answered Jun 19, 2013 at 22:22

jterry

6,2473 gold badges32 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1