isset() || array_key_exists()

[Guest]

Just curious, which do you prefer to use when using them with forms? I am finding myself using array_key_exists more and more instead of isset(), likewise when using $_GET.

Are there any advantages / disadvantages to using either one?

[KyleMassacre]

I think with isset() it still works if it is blank so you may wanna check and make sure there is something in there. Im not too sure about array_key_exists thought

[Dominion]

Depends if you're working with NULL values or not. If you want something to be valid as NULL then isset() isn't acceptable.

 

$array = array('key1' => 'YAY', 'key2' => NULL);

var_dump(isset($array['key1']));             // true
var_dump(array_key_exists('key1', $array));  // true

var_dump(isset($array['key2']));             // false
var_dump(array_key_exists('key2', $array));  // true

Edited June 9, 2013 by Dominion

[Guest]

Depends if you're working with NULL values or not. If you want something to be valid as NULL then isset() isn't acceptable.

 

$array = array('key1' => 'YAY', 'key2' => NULL);

var_dump(isset($array['key1']));             // true
var_dump(array_key_exists('key1', $array));  // true

var_dump(isset($array['key2']));             // false
var_dump(array_key_exists('key2', $array));  // true

Thanks bud :)

[KyleMassacre]

this reminds me because with NWE if I don't use isset() on a get or post I get an error so I wonder if array_key_exists() will also work for certain things

[Dominion]

this reminds me because with NWE if I don't use isset() on a get or post I get an error so I wonder if array_key_exists() will also work for certain things

If you're doing things like -

if(!$_GET['SOMETHING']) {

 

You should be getting an error like this -

Notice: Undefined index

Most people who don't use isset/array_key_exists tend to have error reporting off.

[rockwood]

as far as i know about both functions ,both are having very small difference array_key_exists use after check it is an array or not (means we need to make sure it is in array format or not) but in isset we don't need to do anything else

(by isset directly you can check any type ).

i most like isset

and error reporting off is not good

[Guest]

as far as i know about both functions ,both are having very small difference array_key_exists use after check it is an array or not (means we need to make sure it is in array format or not) but in isset we don't need to do anything else

(by isset directly you can check any type ).

i most like isset

and error reporting off is not good

By the things I was referring to, being a form and $_GET, they will always be arrays so your answer doesn't get me any closer :/

[rockwood]

yes in your case due to GLOBAL variable $_GET is predefined array type but some times if you are not sure about variable type then you should check first, i said about totally overview

you can use both but i prefer isset();