Function: array_search version 35

Function:
Description: Searches the array for a given value and returns the corresponding key if successful.
Version:
Status: latest
Date: 2011-12-20 04:36
Summary: Import from phpjs.
Programmer: jj5
Code
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function array_search (needle, haystack, argStrict) {
    // http://jsphp.co/jsphp/fn/view/array_search
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: array_search('zonneveld', {firstname: 'kevin', middle: 'van', surname: 'zonneveld'});
    // *     returns 1: 'surname'
    // *     example 2: ini_set('phpjs.return_phpjs_arrays', 'on');
    // *     example 2: var ordered_arr = array({3:'value'}, {2:'value'}, {'a':'value'}, {'b':'value'});
    // *     example 2: var key = array_search(/val/g, ordered_arr); // or var key = ordered_arr.search(/val/g);
    // *     returns 2: '3'

    var strict = !!argStrict,
        key = '';
    
    if (haystack && typeof haystack === 'object' && haystack.change_key_case) { // Duck-type check for our own array()-created PHPJS_Array
        return haystack.search(needle, argStrict);
    }
    if (typeof needle === 'object' && needle.exec) { // Duck-type for RegExp
        if (!strict) { // Let's consider case sensitive searches as strict
            var flags = 'i' + (needle.global ? 'g' : '') +
                        (needle.multiline ? 'm' : '') +
                        (needle.sticky ? 'y' : ''); // sticky is FF only
            needle = new RegExp(needle.source, flags);
        }
        for (key in haystack) {
            if (needle.test(haystack[key])) {
                return key;
            }
        }
        return false;
    }

    for (key in haystack) {
        if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
            return key;
        }
    }

    return false;
}
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