Finding the index of a given value in a pre-sorted array

Posted by bobo on Stack Overflow See other posts from Stack Overflow or by bobo
Published on 2010-03-16T13:07:47Z Indexed on 2010/03/16 13:16 UTC
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Filed under:

array

|

binary-trees

|

algorithm

|

php

Today, I went for an interview and the interviewer asked me how I would find the index of a given value (number) in a pre-sorted array like this:

$preSortedArr=array(23,32,36,41,45,54);

He also said that using recursion is not allowed.

I think the function should look like this:

function findIndexByValue($preSortedArray,$value){            
//some codes here       
}

What solution do you think he was expecting from me?

EDIT: sorry, I forgot to add that, he originally asked me to write psuedo codes but I said I don't know. I tried to write in PHP, but I think he's expecting a language-independent solution.

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