关于PHP拆分字符串的步骤

关于PHP拆分字符串的方法
我有个字符串

$data = "Model:Galaxy Nexus SystemVersion:4.3 AppVersionCode:78 AppVersionName:3.140801.4";

我拆分为：
$a = “Model:Galaxy Nexus”，
$b = “SystemVersion:4.3”，
$c = “AppVersionCode:78”，
$d = “AppVersionName:3.140801.4”，

请问有什么好方法吗？
------解决思路----------------------

$data = "Model:Galaxy Nexus SystemVersion:4.3 AppVersionCode:78 AppVersionName:3.140801.4";
$ar = preg_split('/(\w+:)/', $data, -1, PREG_SPLIT_NO_EMPTY 
------解决思路----------------------
 PREG_SPLIT_DELIM_CAPTURE);
$ar = array_map('join', array_chunk($ar, 2));
print_r($ar);

Array
(
    [0] => Model:Galaxy Nexus 
    [1] => SystemVersion:4.3 
    [2] => AppVersionCode:78 
    [3] => AppVersionName:3.140801.4
)