Hi!
Some question about array.
- An array mantains always the order of item as inserted also if I use
string keys?
Or the items are "sorted" cause the hash of the key?
I hope to be clear for this question :)
- Can I know if a key is used?
Something like in_array() but for the key, not for the value.
- Can I remove an item from an array?
Thanks
Fabio wrote:
> Hi!
>
> Some question about array.
>
> - An array mantains always the order of item as inserted also if I
> use string keys? Or the items are "sorted" cause the hash of the key?
> I hope to be clear for this question :)
Yes, the order is maintained, unless you perform some sorting on it.
If you want to sort the array based on the keys (numerical and/or
string-based), you can use ksort() for that.
http://php.net/ksort
> - Can I know if a key is used?
> Something like in_array() but for the key, not for the value.
Sure, like this:
if (isset($array["key"])) {
// do something
}
http://php.net/isset
> - Can I remove an item from an array?
Yes, just pass the array key to the unset() function, like this:
unset($array["key"]);
http://php.net/unset
If you don't know the key, but have the value, use array_search() to
find the key.
http://php.net/array_search
> Thanks
No problem.
--
Kim André Akerø
- kimandre@NOSPAMbetadome.com
(remove NOSPAM to contact me directly)
> > - Can I know if a key is used?
> > Something like in_array() but for the key, not for the value.
>
> Sure, like this:
>
> if (isset($array["key"])) {
> // do something
>
> }
>
> http://php.net/isset
array_key_exists()
On 20 Aug, 12:08, Kim Andr=E9 Aker=F8
> Fabio wrote:
> > Hi!
>
> > Some question about array.
>
> > - An array mantains always the order of item as inserted also if I
> > use string keys? Or the items are "sorted" cause the hash of the key?
> > I hope to be clear for this question :)
>
> Yes, the order is maintained, unless you perform some sorting on it.
>
...but relying on this being the case does not make for robust code.
If there is information in the sequence then it should be explicitly
stated in the data construct.
C
"Kim André Akerø"
news:5itb1gF3qq0jjU1@mid.individual.net...
>> Thanks
>
> No problem.
Thank yo!
Finally good news about php and someone in this NG that tell them to me :)
Another one: since the array is always ordered, can I get the item number n
also if I registered it with a key?
Something like that would work :)
$a = array("a" => "first", "b" => "second", "c" => "last one");
$value = $a[1]; // get "second" that is at the index #1
Thanks again.
On Aug 20, 8:15 am, "Fabio"
> "Kim Andr=E9 Aker=F8"
gionews:5itb1gF3qq0jjU1@mid.individual.net...
>
> Another one: since the array is always ordered, can I get the item number=
n
> also if I registered it with a key?
> Something like that would work :)
>
> $a =3D array("a" =3D> "first", "b" =3D> "second", "c" =3D> "last one");
> $value =3D $a[1]; // get "second" that is at the index #1
>
> Thanks again.
Not directly. The key "1" isn't really any different than any other
key in the array. You can, however, get a list of the keys and then
find the position that way. So, following your example above:
$keys =3D array_keys($a);
$a[$keys[1]]; //this is "second"