Getting Associative Array Keys
<p>How can i get array keys up to specified key. 
I have array like </p>

<pre>
Array
(
    [101] => Array
        (
            [0] => Array
                (
                    [Id] => 56
                    [Val] => 15.25
                )
         )
     [112] => Array
        (
            [0] => Array
                (
                    [Id] => 56
                    [Val] => 15.25
                )
         )
      [223] => Array
        (
            [0] => Array
                (
                    [Id] => 56
                    [Val] => 15.25
                )
         )
       [104] => Array
        (
            [0] => Array
                (
                    [Id] => 56
                    [Val] => 15.25
                )
         )
     [186] => Array
        (
            [0] => Array
                (
                    [Id] => 56
                    [Val] => 15.25
                )
         )
)
</pre>

<p>And i have key "104" , how can i get the array keys up to 104 only i.e,101,112,223 keys only  without looping</p>
