How to find array / dictionary value using key?
It looks like you're writing PHP, in which case you want:
<?$arr=array('us'=>'United', 'ca'=>'canada');$key='ca';echo $arr[$key];?>Notice that the ('us'=>'United', 'ca'=>'canada') needs to be a parameter to the array function in PHP.
Most programming languages that support associative arrays or dictionaries use arr['key'] to retrieve the item specified by 'key'
For instance:
Ruby
ruby-1.9.1-p378 > h = {'us' => 'USA', 'ca' => 'Canada' } => {"us"=>"USA", "ca"=>"Canada"} ruby-1.9.1-p378 > h['ca'] => "Canada" Python
>>> h = {'us':'USA', 'ca':'Canada'}>>> h['ca']'Canada'C#
class P{ static void Main() { var d = new System.Collections.Generic.Dictionary<string, string> { {"us", "USA"}, {"ca", "Canada"}}; System.Console.WriteLine(d["ca"]); }}Lua
t = {us='USA', ca='Canada'}print(t['ca'])print(t.ca) -- Lua's a little different with tables