function trim (str, charlist) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: mdsjack (http://www.mdsjack.bo.it)
    // +   improved by: Alexander Ermolaev (http://snippets.dzone.com/user/AlexanderErmolaev)
    // +      input by: Erkekjetter
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: DxGx
    // +   improved by: Steven Levithan (http://blog.stevenlevithan.com)
    // +    tweaked by: Jack
    // +   bugfixed by: Onno Marsman
    // *     example 1: trim('    Kevin van Zonneveld    ');
    // *     returns 1: 'Kevin van Zonneveld'
    // *     example 2: trim('Hello World', 'Hdle');
    // *     returns 2: 'o Wor'
    // *     example 3: trim(16, 1);
    // *     returns 3: 6
    var whitespace, l = 0,
        i = 0;
    str += '';

    if (!charlist) {
        // default list
        whitespace = " \n\r\t\f\x0b\xa0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000";
    } else {
        // preg_quote custom list
        charlist += '';
        whitespace = charlist.replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g, '$1');
    }

    l = str.length;
    for (i = 0; i < l; i++) {
        if (whitespace.indexOf(str.charAt(i)) === -1) {
            str = str.substring(i);
            break;
        }
    }

    l = str.length;
    for (i = l - 1; i >= 0; i--) {
        if (whitespace.indexOf(str.charAt(i)) === -1) {
            str = str.substring(0, i + 1);
            break;
        }
    }

    return whitespace.indexOf(str.charAt(0)) === -1 ? str : '';
}

function substr (str, start, len) {
    // Returns part of a string  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/substr
    // +     original by: Martijn Wieringa
    // +     bugfixed by: T.Wild
    // +      tweaked by: Onno Marsman
    // +      revised by: Theriault
    // +      improved by: Brett Zamir (http://brett-zamir.me)
    // %    note 1: Handles rare Unicode characters if 'unicode.semantics' ini (PHP6) is set to 'on'
    // *       example 1: substr('abcdef', 0, -1);
    // *       returns 1: 'abcde'
    // *       example 2: substr(2, 0, -6);
    // *       returns 2: false
    // *       example 3: ini_set('unicode.semantics',  'on');
    // *       example 3: substr('a\uD801\uDC00', 0, -1);
    // *       returns 3: 'a'
    // *       example 4: ini_set('unicode.semantics',  'on');
    // *       example 4: substr('a\uD801\uDC00', 0, 2);
    // *       returns 4: 'a\uD801\uDC00'
    // *       example 5: ini_set('unicode.semantics',  'on');
    // *       example 5: substr('a\uD801\uDC00', -1, 1);
    // *       returns 5: '\uD801\uDC00'
    // *       example 6: ini_set('unicode.semantics',  'on');
    // *       example 6: substr('a\uD801\uDC00z\uD801\uDC00', -3, 2);
    // *       returns 6: '\uD801\uDC00z'
    // *       example 7: ini_set('unicode.semantics',  'on');
    // *       example 7: substr('a\uD801\uDC00z\uD801\uDC00', -3, -1)
    // *       returns 7: '\uD801\uDC00z'
    // Add: (?) Use unicode.runtime_encoding (e.g., with string wrapped in "binary" or "Binary" class) to
    // allow access of binary (see file_get_contents()) by: charCodeAt(x) & 0xFF (see https://developer.mozilla.org/En/Using_XMLHttpRequest ) or require conversion first?
    var i = 0,
        allBMP = true,
        es = 0,
        el = 0,
        se = 0,
        ret = '';
    str += '';
    var end = str.length;

    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.php_js.ini = this.php_js.ini || {};
    // END REDUNDANT
    switch ((this.php_js.ini['unicode.semantics'] && this.php_js.ini['unicode.semantics'].local_value.toLowerCase())) {
    case 'on':
        // Full-blown Unicode including non-Basic-Multilingual-Plane characters
        // strlen()
        for (i = 0; i < str.length; i++) {
            if (/[\uD800-\uDBFF]/.test(str.charAt(i)) && /[\uDC00-\uDFFF]/.test(str.charAt(i + 1))) {
                allBMP = false;
                break;
            }
        }

        if (!allBMP) {
            if (start < 0) {
                for (i = end - 1, es = (start += end); i >= es; i--) {
                    if (/[\uDC00-\uDFFF]/.test(str.charAt(i)) && /[\uD800-\uDBFF]/.test(str.charAt(i - 1))) {
                        start--;
                        es--;
                    }
                }
            } else {
                var surrogatePairs = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
                while ((surrogatePairs.exec(str)) != null) {
                    var li = surrogatePairs.lastIndex;
                    if (li - 2 < start) {
                        start++;
                    } else {
                        break;
                    }
                }
            }

            if (start >= end || start < 0) {
                return false;
            }
            if (len < 0) {
                for (i = end - 1, el = (end += len); i >= el; i--) {
                    if (/[\uDC00-\uDFFF]/.test(str.charAt(i)) && /[\uD800-\uDBFF]/.test(str.charAt(i - 1))) {
                        end--;
                        el--;
                    }
                }
                if (start > end) {
                    return false;
                }
                return str.slice(start, end);
            } else {
                se = start + len;
                for (i = start; i < se; i++) {
                    ret += str.charAt(i);
                    if (/[\uD800-\uDBFF]/.test(str.charAt(i)) && /[\uDC00-\uDFFF]/.test(str.charAt(i + 1))) {
                        se++; // Go one further, since one of the "characters" is part of a surrogate pair
                    }
                }
                return ret;
            }
            break;
        }
        // Fall-through
    case 'off':
        // assumes there are no non-BMP characters;
        //    if there may be such characters, then it is best to turn it on (critical in true XHTML/XML)
    default:
        if (start < 0) {
            start += end;
        }
        end = typeof len === 'undefined' ? end : (len < 0 ? len + end : len + start);
        // PHP returns false if start does not fall within the string.
        // PHP returns false if the calculated end comes before the calculated start.
        // PHP returns an empty string if start and end are the same.
        // Otherwise, PHP returns the portion of the string from start to end.
        return start >= str.length || start < 0 || start > end ? !1 : str.slice(start, end);
    }
    return undefined; // Please Netbeans
}

function explode (delimiter, string, limit) {
    // http://kevin.vanzonneveld.net
    // +     original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: kenneth
    // +     improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: d3x
    // +     bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: explode(' ', 'Kevin van Zonneveld');
    // *     returns 1: {0: 'Kevin', 1: 'van', 2: 'Zonneveld'}
    // *     example 2: explode('=', 'a=bc=d', 2);
    // *     returns 2: ['a', 'bc=d']
    var emptyArray = {
        0: ''
    };

    // third argument is not required
    if (arguments.length < 2 || typeof arguments[0] == 'undefined' || typeof arguments[1] == 'undefined') {
        return null;
    }

    if (delimiter === '' || delimiter === false || delimiter === null) {
        return false;
    }

    if (typeof delimiter == 'function' || typeof delimiter == 'object' || typeof string == 'function' || typeof string == 'object') {
        return emptyArray;
    }

    if (delimiter === true) {
        delimiter = '1';
    }

    if (!limit) {
        return string.toString().split(delimiter.toString());
    }
    // support for limit argument
    var splitted = string.toString().split(delimiter.toString());
    var partA = splitted.splice(0, limit - 1);
    var partB = splitted.join(delimiter.toString());
    partA.push(partB);
    return partA;
}

function strpos (haystack, needle, offset) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Onno Marsman    
    // +   bugfixed by: Daniel Esteban
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: strpos('Kevin van Zonneveld', 'e', 5);
    // *     returns 1: 14
    var i = (haystack + '').indexOf(needle, (offset || 0));
    return i === -1 ? false : i;
}

function empty (mixed_var) {
    // http://kevin.vanzonneveld.net
    // +   original by: Philippe Baumann
    // +      input by: Onno Marsman
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: LH
    // +   improved by: Onno Marsman
    // +   improved by: Francesco
    // +   improved by: Marc Jansen
    // +   input by: Stoyan Kyosev (http://www.svest.org/)
    // *     example 1: empty(null);
    // *     returns 1: true
    // *     example 2: empty(undefined);
    // *     returns 2: true
    // *     example 3: empty([]);
    // *     returns 3: true
    // *     example 4: empty({});
    // *     returns 4: true
    // *     example 5: empty({'aFunc' : function () { alert('humpty'); } });
    // *     returns 5: false
    var key;

    if (mixed_var === "" || mixed_var === 0 || mixed_var === "0" || mixed_var === null || mixed_var === false || typeof mixed_var === 'undefined') {
        return true;
    }

    if (typeof mixed_var == 'object') {
        for (key in mixed_var) {
            return false;
        }
        return true;
    }

    return false;
}
function parse_url (str, component) {
    // http://kevin.vanzonneveld.net
    // +      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;
}