关联数组在PHP中获取键值

Question

array(24) { ["user_id"]=> string(1) "9" ["facebook_id"]=> string(15) "381305418721463" ["first_name"]=> string(4) "John" ["last_name"]=> string(4) "Does" ["current_latitude"]=> string(10) "-37.825697" ["current_longitude"]=> string(10) "144.999965" ["current_address"]=> string(45) "229 Swan Street, Richmond VIC 3121, Australia" ["date_of_birth"]=> string(10) "01/01/1990" ["city"]=> string(30) "Melbourne, Victoria, Australia" ["country"]=> string(0) "" ["email_address"]=> string(22) "bzingatester@gmail.com" ["profile_pic"]=> string(0) "" ["first_login"]=> string(2) "no" ["blocked_users_id"]=> string(0) "" ["my_friend"]=> string(52) "10152805813948795,10155307822515151,1389504958030240" ["search_radius"]=> string(2) "50" ["device_type"]=> string(3) "ios" ["device_id"]=> string(1) "1" ["device_token"]=> string(64) "6ddaf9d59418e99b1c9cb28c21d94647bfed9f78a80b410164c1f2798beee84a" ["hideFromActivityFeed"]=> string(2) "no" ["hideFromFriendsofFriends"]=> string(2) "no" ["hideNotification"]=> string(2) "no" ["created_date"]=> string(19) "2015-01-07 01:00:11" ["modified_date"]=> string(19) "2015-02-27 05:36:12" }

In PHP I have an array called $userData as per above, I want to be able to echo values such as first name 'first_name', using code like this

echo $userInfo->first_name; 

(this doesnt seem to work)

I DO NOT want to loop and fetch all keys in array using foreach, just get values 'first_name', 'last_name' ect. from the array

Answer 1

请这样尝试

$first_name =  $userInfo['first_name'] // $userInfo is array name

Answer 2

Actually we use arrays in programming to prevent loop or something like this to find a value, so instead of this structure,

$a = 'text1';
$b = 0;
$c = true;
$d = 'text2';

we use arrays:

$array = array('a' = > 'text1', 'b' => 0, 'c' => true, 'd' => 'text2' );

and to access the value of some key, we call the key name, inside brackets after array's name:

echo $array['a'];
//will echo text1
//or
echo $array['b'];
//will echo true

This is associative array ...

if you just pass values to an array without keys, php will use numeric keys instead...

$array = array( 'text1', '0', true, 'text2' );

$array[0] = 'text1';
$array[1] = 0;
$array[2] = true;
$array[3] = 'text2';

Answer 3

You can change the array to object and then use -> like below

  $userData= (object) $userData;

And then $userData->firstName ..etc

Answer 4

Please use type casting.

$userinfo = (array)$userInfo;

Then you access your key first_name.

echo $userinfo['first_name'];

Answer 5

First of use a different method to dump data ..

echo "<pre>";
print_r($your_array);
exit;

It just simply bodes for a better presentation to see what is an object and what is an array.

You cannot access array members with the object notation. You can however cast your array as an object.

(object)$yourarray;

If you want to access array members, use :

$yourarray['first_name'];

If you cast as an object:

$obj = (object)$yourarray ;

Now access:

$obj->firstname;

Hope that helps.