Question

I have written the following function to search an multi-dimensional array by key, but if I call the function with key uri, it appends arrays having key 0 to the found array. What’s wrong?

function search_arr($array, $key, &$found) {
    foreach ($array as $k => $each) {
        if ($k == $key) {
            // output of "print $k = $key" is "0 = uri"
            $found[] = $each;
        }   
        if (is_array($each)) {
            search_arr($each, $key, $found);
        }   
    }   
}

Answer 1

Use === to force a value and type match. You get zeros because comparing 0 and “uri” is true – think of them as both evaluating to 0. For complete details of how PHP handles these ‘loose’ comparisons, see this section of the manual.