which one is faster isset(), array_search(), in_array()

[guillermobytes]

Hi,

i was wondering what was the best option to store a string in an array.
let me explain: I only need one part of the elements in the array. i.e. i can use the key to store my string, or i can use the value to store the string.
I'll make it clearer with some code:

$string = 'someString';
$array = array();
//first way to save
$array[$string] = true;//array('someString' => true)
//second way to save
$array[] = $string; //array(0 => 'someString')

so my question is: what is the most efficient option to save a string in an array if I only use one part of the elements (key or value) to store the strings.

maybe how i will use that array helps:
I will need to know afterwards, if the string is stored in the array.

//i get a string and i want to know if it is already in array
in_array($string, $array);
isset($array[$string]);
...

wich one is the best?
thanks!

[Markus]

Forget about which is fastest and follow your own logic: you're storing a string in an array, i.e. you're not using the string as an array index. Therefore, store the string in the array and then use in_array(). Makes sense, no?

[guillermobytes]

ok it makes sense.
thank you!

[philipwayne]

isset is the fastest. But as markus said your not storing the index so it will not work correctly.