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function natsort (inputArr) {
    // Sort an array using natural sort  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/natsort    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // +   improved by: Theriault
    // %        note 1: This function deviates from PHP in returning a copy of the array instead
    // %        note 1: of acting by reference and returning true; this was necessary because    // %        note 1: IE does not allow deleting and re-adding of properties without caching
    // %        note 1: of property position; you can set the ini of "phpjs.strictForIn" to true to
    // %        note 1: get the PHP behavior, but use this only if you are in an environment
    // %        note 1: such as Firefox extensions where for-in iteration order is fixed and true
    // %        note 1: property deletion is supported. Note that we intend to implement the PHP    // %        note 1: behavior by default if IE ever does allow it; only gives shallow copy since
    // %        note 1: is by reference in PHP anyways
    // -    depends on: strnatcmp
    // *     example 1: $array1 = {a:"img12.png", b:"img10.png", c:"img2.png", d:"img1.png"};
    // *     example 1: $array1 = natsort($array1);    // *     returns 1: {d: 'img1.png', c: 'img2.png', b: 'img10.png', a: 'img12.png'}
    var valArr = [],
        k, i, ret, that = this,
        strictForIn = false,
        populateArr = {}; 
    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.php_js.ini = this.php_js.ini || {};
    // END REDUNDANT    strictForIn = this.php_js.ini['phpjs.strictForIn'] && this.php_js.ini['phpjs.strictForIn'].local_value && this.php_js.ini['phpjs.strictForIn'].local_value !== 'off';
    populateArr = strictForIn ? inputArr : populateArr;
 
    // Get key and value arrays
    for (k in inputArr) {        if (inputArr.hasOwnProperty(k)) {
            valArr.push([k, inputArr[k]]);
            if (strictForIn) {
                delete inputArr[k];
            }        }
    }
    valArr.sort(function (a, b) {
        return that.strnatcmp(a[1], b[1]);
    }); 
    // Repopulate the old array
    for (i = 0; i < valArr.length; i++) {
        populateArr[valArr[i][0]] = valArr[i][1];
    } 
    return strictForIn || populateArr;
}

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$array1 = {a:"img12.png", b:"img10.png", c:"img2.png", d:"img1.png"};
$array1 = natsort($array1);

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{d: 'img1.png', c: 'img2.png', b: 'img10.png', a: 'img12.png'}