search - How to use PHP in_array with associative array?

Question

Is there any php function such as in_array for associative arrays you get by the mysql function "mysql_fetch assoc" ?

For example, if I have an $array that looks like this:

array(0=>(array(ID=>1, name=>"Smith"), 1=>(array(ID=>2, name=>"John"))

Can I do something like in_array(key,value,array)?

Or in my case, if I am looking for the ID value of "1", in_array("ID",1,$array).

This is my solution, comment on it if you think it's the right way:

function in_assoc_array($key,$value,$array)
{
    if (empty($array))
        return false;
    else
    {
        foreach($array as $a)
        {
            if ($a[$key] == $value)
                return true;
        }
        return false;
    }
}

Answer 1

In your case, I wonder if simply using isset() makes more sense, i.e.

isset($a[$key])