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function popen (filename, mode, use_include_path, context) {
    // Execute a command and open either a read or a write pipe to it  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/popen    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   input by: Paul Smith
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // -    depends on: file_get_contents
    // *     example 1: popen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');    // *     returns 1: 'Resource id #1'
    var resource = {},
        i = 0,
        that = this;
    var getFuncName = function (fn) {        var name = (/\W*function\s+([\w\$]+)\s*\(/).exec(fn);
        if (!name) {
            return '(Anonymous)';
        }
        return name[1];    };
 
    // BEGIN file inclusion: file_get_contents
    var file_get_contents = function (url) {
        var req = that.window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();        if (!req) {
            throw new Error('XMLHttpRequest not supported');
        }
        if (!(/^http/).test(url)) { // Allow references within or below the same directory (should fix to allow other relative references or root reference; could make dependent on parse_url())
            url = that.window.location.href + '/' + url;        }
        req.open("GET", url, false);
        req.send(null);
        return req.responseText;
    };    // END file inclusion
 
    if (use_include_path === 1 || use_include_path === '1' || use_include_path === true) {
        // Not implemented yet: Search for file in include path too
    }    if (context) {
        // Not implemented yet, but could be useful to modify nature of HTTP request, etc.
    }
 
    for (i = 0; i < mode.length; i++) { // Have to deal with other flags if ever allow        switch (mode.charAt(i)) {
        case 'r':
            if (!mode.charAt(i + 1) || mode.charAt(i + 1) !== '+') {
                break;
            }        case 'w':
            // or 'w+'
        case 'a':
            // or 'a+'
        case 'x':            // or 'x+'
            throw 'Writing is not implemented';
        case 'b':
        case 't':
            throw 'Windows-only modes are not supported';        default:
            throw 'Unrecognized file mode passed to ' + getFuncName(arguments.caller) + '()';
        }
    }
     // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.php_js.resourceData = this.php_js.resourceData || {};
    this.php_js.resourceDataPointer = this.php_js.resourceDataPointer || {};
    this.php_js.resourceIdCounter = this.php_js.resourceIdCounter || 0;    // END REDUNDANT
 
    // BEGIN STATIC
 
    function PHPJS_Resource(type, id, opener) { // Can reuse the following for other resources, just changing the instantiation        // See http://php.net/manual/en/resource.php for types
        this.type = type;
        this.id = id;
        this.opener = opener;
    }    PHPJS_Resource.prototype.toString = function () {
        return 'Resource id #' + this.id;
    };
    PHPJS_Resource.prototype.get_resource_type = function () {
        return this.type;    };
    PHPJS_Resource.prototype.var_dump = function () {
        return 'resource(' + this.id + ') of type (' + this.type + ')';
    };
    // END STATIC 
    this.php_js.resourceIdCounter++;
 
    this.php_js.resourceData[this.php_js.resourceIdCounter] = this.file_get_contents(filename);
    this.php_js.resourceDataPointer[this.php_js.resourceIdCounter] = 0; 
    resource = new PHPJS_Resource('stream', this.php_js.resourceIdCounter, 'popen');
    resource.mode = mode; // Add file-specific attributes
 
    return resource; // may be 'file' instead of 'stream' type on some systems}

1

popen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');

1

'Resource id #1'