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function parse_url (str, component) {
    // Parse a URL and return its components  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/parse_url    // +      original by: Steven Levithan (http://blog.stevenlevithan.com)
    // + reimplemented by: Brett Zamir (http://brett-zamir.me)
    // + input by: Lorenzo Pisani
    // + input by: Tony
    // + improved by: Brett Zamir (http://brett-zamir.me)    // %          note: Based on http://stevenlevithan.com/demo/parseuri/js/assets/parseuri.js
    // %          note: blog post at http://blog.stevenlevithan.com/archives/parseuri
    // %          note: demo at http://stevenlevithan.com/demo/parseuri/js/assets/parseuri.js
    // %          note: Does not replace invalid characters with '_' as in PHP, nor does it return false with
    // %          note: a seriously malformed URL.    // %          note: Besides function name, is essentially the same as parseUri as well as our allowing
    // %          note: an extra slash after the scheme/protocol (to allow file:/// as in PHP)
    // *     example 1: parse_url('http://username:password@hostname/path?arg=value#anchor');
    // *     returns 1: {scheme: 'http', host: 'hostname', user: 'username', pass: 'password', path: '/path', query: 'arg=value', fragment: 'anchor'}
    var key = ['source', 'scheme', 'authority', 'userInfo', 'user', 'pass', 'host', 'port',                         'relative', 'path', 'directory', 'file', 'query', 'fragment'],
        ini = (this.php_js && this.php_js.ini) || {},
        mode = (ini['phpjs.parse_url.mode'] && 
            ini['phpjs.parse_url.mode'].local_value) || 'php',
        parser = {            php: /^(?:([^:\/?#]+):)?(?:\/\/()(?:(?:()(?:([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?()(?:(()(?:(?:[^?#\/]*\/)*)()(?:[^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
            strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
            loose: /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/\/?)?((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/ // Added one optional slash to post-scheme to catch file:/// (should restrict this)
        };
     var m = parser[mode].exec(str),
        uri = {},
        i = 14;
    while (i--) {
        if (m[i]) {          uri[key[i]] = m[i];  
        }
    }
 
    if (component) {        return uri[component.replace('PHP_URL_', '').toLowerCase()];
    }
    if (mode !== 'php') {
        var name = (ini['phpjs.parse_url.queryKey'] && 
                ini['phpjs.parse_url.queryKey'].local_value) || 'queryKey';        parser = /(?:^|&)([^&=]*)=?([^&]*)/g;
        uri[name] = {};
        uri[key[12]].replace(parser, function ($0, $1, $2) {
            if ($1) {uri[name][$1] = $2;}
        });    }
    delete uri.source;
    return uri;
}

1

parse_url('http://username:password@hostname/path?arg=value#anchor');

1

{scheme: 'http', host: 'hostname', user: 'username', pass: 'password', path: '/path', query: 'arg=value', fragment: 'anchor'}