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function version_compare (v1, v2, operator) {
    // Compares two "PHP-standardized" version number strings  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/version_compare    // +      original by: Philippe Jausions (http://pear.php.net/user/jausions)
    // +      original by: Aidan Lister (http://aidanlister.com/)
    // + reimplemented by: Kankrelune (http://www.webfaktory.info/)
    // +      improved by: Brett Zamir (http://brett-zamir.me)
    // +      improved by: Scott Baker    // +      improved by: Theriault
    // *        example 1: version_compare('8.2.5rc', '8.2.5a');
    // *        returns 1: 1
    // *        example 2: version_compare('8.2.50', '8.2.52', '<');
    // *        returns 2: true    // *        example 3: version_compare('5.3.0-dev', '5.3.0');
    // *        returns 3: -1
    // *        example 4: version_compare('4.1.0.52','4.01.0.51');
    // *        returns 4: 1
    // BEGIN REDUNDANT    this.php_js = this.php_js || {};
    this.php_js.ENV = this.php_js.ENV || {};
    // END REDUNDANT
    // Important: compare must be initialized at 0. 
    var i = 0,        x = 0,
        compare = 0,
        // vm maps textual PHP versions to negatives so they're less than 0.
        // PHP currently defines these as CASE-SENSITIVE. It is important to
        // leave these as negatives so that they can come before numerical versions        // and as if no letters were there to begin with.
        // (1alpha is < 1 and < 1.1 but > 1dev1)
        // If a non-numerical value can't be mapped to this table, it receives
        // -7 as its value.
        vm = {            'dev': -6,
            'alpha': -5,
            'a': -5,
            'beta': -4,
            'b': -4,            'RC': -3,
            'rc': -3,
            '#': -2,
            'p': -1,
            'pl': -1        },
        // This function will be called to prepare each version argument.
        // It replaces every _, -, and + with a dot.
        // It surrounds any nonsequence of numbers/dots with dots.
        // It replaces sequences of dots with a single dot.        //    version_compare('4..0', '4.0') == 0
        // Important: A string of 0 length needs to be converted into a value
        // even less than an unexisting value in vm (-7), hence [-8].
        // It's also important to not strip spaces because of this.
        //   version_compare('', ' ') == 1        prepVersion = function (v) {
            v = ('' + v).replace(/[_\-+]/g, '.');
            v = v.replace(/([^.\d]+)/g, '.$1.').replace(/\.{2,}/g, '.');
            return (!v.length ? [-8] : v.split('.'));
        },        // This converts a version component to a number.
        // Empty component becomes 0.
        // Non-numerical component becomes a negative number.
        // Numerical component becomes itself as an integer.
        numVersion = function (v) {            return !v ? 0 : (isNaN(v) ? vm[v] || -7 : parseInt(v, 10));
        };
    v1 = prepVersion(v1);
    v2 = prepVersion(v2);
    x = Math.max(v1.length, v2.length);    for (i = 0; i < x; i++) {
        if (v1[i] == v2[i]) {
            continue;
        }
        v1[i] = numVersion(v1[i]);        v2[i] = numVersion(v2[i]);
        if (v1[i] < v2[i]) {
            compare = -1;
            break;
        } else if (v1[i] > v2[i]) {            compare = 1;
            break;
        }
    }
    if (!operator) {        return compare;
    }
 
    // Important: operator is CASE-SENSITIVE.
    // "No operator" seems to be treated as "<."    // Any other values seem to make the function return null.
    switch (operator) {
    case '>':
    case 'gt':
        return (compare > 0);    case '>=':
    case 'ge':
        return (compare >= 0);
    case '<=':
    case 'le':        return (compare <= 0);
    case '==':
    case '=':
    case 'eq':
        return (compare === 0);    case '<>':
    case '!=':
    case 'ne':
        return (compare !== 0);
    case '':    case '<':
    case 'lt':
        return (compare < 0);
    default:
        return null;    }
}

1

version_compare('8.2.5rc', '8.2.5a');

1

1

1

version_compare('8.2.50', '8.2.52', '<');

1

true