JsPHP: a JavaScript library providing the PHP API

function array_shift (inputArr) {
    // http://jsphp.co/jsphp/fn/view/array_shift
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Martijn Wieringa
    // %        note 1: Currently does not handle objects
    // *     example 1: array_shift(['Kevin', 'van', 'Zonneveld']);
    // *     returns 1: 'Kevin'
    var props = false,
        shift = undefined,
        pr = '',
        allDigits = /^\d$/,
        int_ct = -1,
        _checkToUpIndices = function (arr, ct, key) {
            // Deal with situation, e.g., if encounter index 4 and try to set it to 0, but 0 exists later in loop (need to
            // increment all subsequent (skipping current key, since we need its value below) until find unused)
            if (arr[ct] !== undefined) {
                var tmp = ct;
                ct += 1;
                if (ct === key) {
                    ct += 1;
                }
                ct = _checkToUpIndices(arr, ct, key);
                arr[ct] = arr[tmp];
                delete arr[tmp];
            }
            return ct;
        };


    if (inputArr.length === 0) {
        return null;
    }
    if (inputArr.length > 0) {
        return inputArr.shift();
    }

/*
    UNFINISHED FOR HANDLING OBJECTS
    for (pr in inputArr) {
        if (inputArr.hasOwnProperty(pr)) {
            props = true;
            shift = inputArr[pr];
            delete inputArr[pr];
            break;
        }
    }
    for (pr in inputArr) {
        if (inputArr.hasOwnProperty(pr)) {
            if (pr.search(allDigits) !== -1) {
                int_ct += 1;
                if (parseInt(pr, 10) === int_ct) { // Key is already numbered ok, so don't need to change key for value
                    continue;
                }
                _checkToUpIndices(inputArr, int_ct, pr);
                arr[int_ct] = arr[pr];
                delete arr[pr];
            }
        }
    }
    if (!props) {
        return null;
    }
    return shift;
    */
}