Javascript include : Laguage & Control Structures : PHP functions in JavaScript JAVASCRIPT TUTORIALS

function include( filename ) {
    // !No description available for include. @php.js developers: Please update the function summary text file.
    // 
    // version: 810.114
    // discuss at: http://phpjs.org/functions/include
    // +   original by: mdsjack (http://www.mdsjack.bo.it)
    // +   improved by: Legaev Andrey
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Michael White (http://getsprink.com)
    // %        note 1: Force Javascript execution to pause until the file is loaded. Usually causes failure if the file never loads. ( Use sparingly! )
    // %        note 2: The included file does not come available until a second script block, so typically use this in the header.
    // *     example 1: include('http://www.phpjs.org/js/phpjs/_supporters/pj_test_supportfile_2.js');
    // *     returns 1: 1
    var js = document.createElement('script');
    js.setAttribute('type', 'text/javascript');
    js.setAttribute('src', filename);
    js.setAttribute('defer', 'defer');
    document.getElementsByTagName('HEAD')[0].appendChild(js);

    // save include state for reference by include_once
    var cur_file = {};
    cur_file[window.location.href] = 1;

    if (!window.php_js) window.php_js = {};
    if (!window.php_js.includes) window.php_js.includes = cur_file;
    if (!window.php_js.includes[filename]) {
        window.php_js.includes[filename] = 1;
    } else {
        window.php_js.includes[filename]++;
    }

    return window.php_js.includes[filename];
}