How to grab value from array

Well, So you are new to this world. You are welcome.

Let your array value is names as $json. This value is a json format, so for access this value you need to decode them. You need to use a function called json_decode, which has two parameter, the first one is string where you pass your variable json, an second one is bool where you pass true or false.

You have to pass when you want your array as associative not object. Here i ignore the second option, so my return array is object.

After decoding your json string you have an array, now you have to use a loop foreach to browse all the elements of the array. As you can see in the resultant array below, the array is multi-dimensional so after applying a foreach loop you just reach the first depth. For getting the value of category you should need to use -> after $val which is the first depth array.

$json = '[{"category":"Exit Sign"},{"category":"Leaving"},{"category":"Illuminated"},{"category":"Sign"},{"category":"Red"},{"category":"Warning Sign"},{"category":"Above"}]';

$arr = json_decode($json); //Also you can pass $yourArr['categories'];

foreach($arr as $val){
    echo $val->category."<br/>";
}

After decoding your array looks like:

Array
(
    [0] => stdClass Object
        (
            [category] => Exit Sign
        )

    [1] => stdClass Object
        (
            [category] => Leaving
        )

    [2] => stdClass Object
        (
            [category] => Illuminated
        )

    [3] => stdClass Object
        (
            [category] => Sign
        )

    [4] => stdClass Object
        (
            [category] => Red
        )

    [5] => stdClass Object
        (
            [category] => Warning Sign
        )

    [6] => stdClass Object
        (
            [category] => Above
        )

)

Result:

Exit Sign
Leaving
Illuminated
Sign
Red
Warning Sign
Above