I would like to find the value in an array using the key.
Like this:
$array=('us'=>'United', 'ca'=>'canada');
$key='ca';
How can I have the value 'canada'?
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2What language? I see one answer that appears to be assuming Perl, and one that's assuming PHP.Paul Tomblin– Paul Tomblin2010-06-04 00:39:23 +00:00Commented Jun 4, 2010 at 0:39
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1If it is PHP you might want to read: php.net/manual/de/language.types.array.phpFelix Kling– Felix Kling2010-06-04 00:40:45 +00:00Commented Jun 4, 2010 at 0:40
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1Yes, it's PHP. Thanks for the link.JEagle– JEagle2010-06-04 00:50:11 +00:00Commented Jun 4, 2010 at 0:50
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2 Answers
It's as simple as this :
$array[$key];
Comments
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
