/* 
 * More info at: http://phpjs.org
 * 
 * This is version: 3.08
 * php.js is copyright 2010 Kevin van Zonneveld.
 * 
 * Portions copyright Brett Zamir (http://brett-zamir.me), Kevin van Zonneveld
 * and a huge list of other folks.  see http://phpjs.org for full list
 * 
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL KEVIN VAN ZONNEVELD BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */ 

/*Functions in this package

    * addslashes
    * empty
    * htmlspecialchars
    * htmlspecialchars_decode
    * in_array
    * is_null
    * isset
    * json_decode
    * json_encode
    * json_last_error
    * ltrim
    * md5
    * sha1
    * stripslashes
    * substr
    * trim
    * urldecode
    * urlencode
    * utf8_encode
*/
// Compression: minified


function addslashes(str){return(str+'').replace(/([\\"'])/g,"\\$1").replace(/\u0000/g,"\\0");}
function empty(mixed_var){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 htmlspecialchars(string,quote_style,charset,double_encode){var optTemp=0,i=0,noquotes=false;if(typeof quote_style==='undefined'||quote_style===null){quote_style=2;}
string=string.toString();if(double_encode!==false){string=string.replace(/&/g,'&');}
string=string.replace(/</g,'&lt;').replace(/>/g,'&gt;');var OPTS={'ENT_NOQUOTES':0,'ENT_HTML_QUOTE_SINGLE':1,'ENT_HTML_QUOTE_DOUBLE':2,'ENT_COMPAT':2,'ENT_QUOTES':3,'ENT_IGNORE':4};if(quote_style===0){noquotes=true;}
if(typeof quote_style!=='number'){quote_style=[].concat(quote_style);for(i=0;i<quote_style.length;i++){if(OPTS[quote_style[i]]===0){noquotes=true;}
else if(OPTS[quote_style[i]]){optTemp=optTemp|OPTS[quote_style[i]];}}
quote_style=optTemp;}
if(quote_style&OPTS.ENT_HTML_QUOTE_SINGLE){string=string.replace(/'/g,'&#039;');}
if(!noquotes){string=string.replace(/"/g,'&quot;');}
return string;}
function htmlspecialchars_decode(string,quote_style){var optTemp=0,i=0,noquotes=false;if(typeof quote_style==='undefined'){quote_style=2;}
string=string.toString().replace(/&lt;/g,'<').replace(/&gt;/g,'>');var OPTS={'ENT_NOQUOTES':0,'ENT_HTML_QUOTE_SINGLE':1,'ENT_HTML_QUOTE_DOUBLE':2,'ENT_COMPAT':2,'ENT_QUOTES':3,'ENT_IGNORE':4};if(quote_style===0){noquotes=true;}
if(typeof quote_style!=='number'){quote_style=[].concat(quote_style);for(i=0;i<quote_style.length;i++){if(OPTS[quote_style[i]]===0){noquotes=true;}
else if(OPTS[quote_style[i]]){optTemp=optTemp|OPTS[quote_style[i]];}}
quote_style=optTemp;}
if(quote_style&OPTS.ENT_HTML_QUOTE_SINGLE){string=string.replace(/&#0*39;/g,"'");}
if(!noquotes){string=string.replace(/&quot;/g,'"');}
string=string.replace(/&amp;/g,'&');return string;}
function is_null(mixed_var){return(mixed_var===null);}
function isset(){var a=arguments,l=a.length,i=0;if(l===0){throw new Error('Empty isset');}
while(i!==l){if(typeof(a[i])=='undefined'||a[i]===null){return false;}else{i++;}}
return true;}
function json_decode(str_json){var json=this.window.JSON;if(typeof json==='object'&&typeof json.parse==='function'){try{return json.parse(str_json);}catch(err){if(!(err instanceof SyntaxError)){throw new Error('Unexpected error type in json_decode()');}
this.php_js=this.php_js||{};this.php_js.last_error_json=4;return null;}}
var cx=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;var j;var text=str_json;cx.lastIndex=0;if(cx.test(text)){text=text.replace(cx,function(a){return'\\u'+
('0000'+a.charCodeAt(0).toString(16)).slice(-4);});}
if((/^[\],:{}\s]*$/).test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,'@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,']').replace(/(?:^|:|,)(?:\s*\[)+/g,''))){j=eval('('+text+')');return j;}
this.php_js=this.php_js||{};this.php_js.last_error_json=4;return null;}
function json_encode(mixed_val){var retVal,json=this.window.JSON;try{if(typeof json==='object'&&typeof json.stringify==='function'){retVal=json.stringify(mixed_val);if(retVal===undefined){throw new SyntaxError('json_encode');}
return retVal;}
var value=mixed_val;var quote=function(string){var escapable=/[\\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;var meta={'\b':'\\b','\t':'\\t','\n':'\\n','\f':'\\f','\r':'\\r','"':'\\"','\\':'\\\\'};escapable.lastIndex=0;return escapable.test(string)?'"'+string.replace(escapable,function(a){var c=meta[a];return typeof c==='string'?c:'\\u'+('0000'+a.charCodeAt(0).toString(16)).slice(-4);})+'"':'"'+string+'"';};var str=function(key,holder){var gap='';var indent='    ';var i=0;var k='';var v='';var length=0;var mind=gap;var partial=[];var value=holder[key];if(value&&typeof value==='object'&&typeof value.toJSON==='function'){value=value.toJSON(key);}
switch(typeof value){case'string':return quote(value);case'number':return isFinite(value)?String(value):'null';case'boolean':case'null':return String(value);case'object':if(!value){return'null';}
if(value instanceof PHPJS_Resource){throw new SyntaxError('json_encode');}
gap+=indent;partial=[];if(Object.prototype.toString.apply(value)==='[object Array]'){length=value.length;for(i=0;i<length;i+=1){partial[i]=str(i,value)||'null';}
v=partial.length===0?'[]':gap?'[\n'+gap+
partial.join(',\n'+gap)+'\n'+
mind+']':'['+partial.join(',')+']';gap=mind;return v;}
for(k in value){if(Object.hasOwnProperty.call(value,k)){v=str(k,value);if(v){partial.push(quote(k)+(gap?': ':':')+v);}}}
v=partial.length===0?'{}':gap?'{\n'+gap+partial.join(',\n'+gap)+'\n'+
mind+'}':'{'+partial.join(',')+'}';gap=mind;return v;case'undefined':case'function':default:throw new SyntaxError('json_encode');}};return str('',{'':value});}catch(err){if(!(err instanceof SyntaxError)){throw new Error('Unexpected error type in json_encode()');}
this.php_js=this.php_js||{};this.php_js.last_error_json=4;return null;}}
function json_last_error(){return this.php_js&&this.php_js.last_error_json?this.php_js.last_error_json:0;}
function ltrim(str,charlist){charlist=!charlist?' \\s\u00A0':(charlist+'').replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g,'$1');var re=new RegExp('^['+charlist+']+','g');return(str+'').replace(re,'');}
function md5(str){var xl;var rotateLeft=function(lValue,iShiftBits){return(lValue<<iShiftBits)|(lValue>>>(32-iShiftBits));};var addUnsigned=function(lX,lY){var lX4,lY4,lX8,lY8,lResult;lX8=(lX&0x80000000);lY8=(lY&0x80000000);lX4=(lX&0x40000000);lY4=(lY&0x40000000);lResult=(lX&0x3FFFFFFF)+(lY&0x3FFFFFFF);if(lX4&lY4){return(lResult^0x80000000^lX8^lY8);}
if(lX4|lY4){if(lResult&0x40000000){return(lResult^0xC0000000^lX8^lY8);}else{return(lResult^0x40000000^lX8^lY8);}}else{return(lResult^lX8^lY8);}};var _F=function(x,y,z){return(x&y)|((~x)&z);};var _G=function(x,y,z){return(x&z)|(y&(~z));};var _H=function(x,y,z){return(x^y^z);};var _I=function(x,y,z){return(y^(x|(~z)));};var _FF=function(a,b,c,d,x,s,ac){a=addUnsigned(a,addUnsigned(addUnsigned(_F(b,c,d),x),ac));return addUnsigned(rotateLeft(a,s),b);};var _GG=function(a,b,c,d,x,s,ac){a=addUnsigned(a,addUnsigned(addUnsigned(_G(b,c,d),x),ac));return addUnsigned(rotateLeft(a,s),b);};var _HH=function(a,b,c,d,x,s,ac){a=addUnsigned(a,addUnsigned(addUnsigned(_H(b,c,d),x),ac));return addUnsigned(rotateLeft(a,s),b);};var _II=function(a,b,c,d,x,s,ac){a=addUnsigned(a,addUnsigned(addUnsigned(_I(b,c,d),x),ac));return addUnsigned(rotateLeft(a,s),b);};var convertToWordArray=function(str){var lWordCount;var lMessageLength=str.length;var lNumberOfWords_temp1=lMessageLength+8;var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1%64))/64;var lNumberOfWords=(lNumberOfWords_temp2+1)*16;var lWordArray=new Array(lNumberOfWords-1);var lBytePosition=0;var lByteCount=0;while(lByteCount<lMessageLength){lWordCount=(lByteCount-(lByteCount%4))/4;lBytePosition=(lByteCount%4)*8;lWordArray[lWordCount]=(lWordArray[lWordCount]|(str.charCodeAt(lByteCount)<<lBytePosition));lByteCount++;}
lWordCount=(lByteCount-(lByteCount%4))/4;lBytePosition=(lByteCount%4)*8;lWordArray[lWordCount]=lWordArray[lWordCount]|(0x80<<lBytePosition);lWordArray[lNumberOfWords-2]=lMessageLength<<3;lWordArray[lNumberOfWords-1]=lMessageLength>>>29;return lWordArray;};var wordToHex=function(lValue){var wordToHexValue="",wordToHexValue_temp="",lByte,lCount;for(lCount=0;lCount<=3;lCount++){lByte=(lValue>>>(lCount*8))&255;wordToHexValue_temp="0"+lByte.toString(16);wordToHexValue=wordToHexValue+wordToHexValue_temp.substr(wordToHexValue_temp.length-2,2);}
return wordToHexValue;};var x=[],k,AA,BB,CC,DD,a,b,c,d,S11=7,S12=12,S13=17,S14=22,S21=5,S22=9,S23=14,S24=20,S31=4,S32=11,S33=16,S34=23,S41=6,S42=10,S43=15,S44=21;str=this.utf8_encode(str);x=convertToWordArray(str);a=0x67452301;b=0xEFCDAB89;c=0x98BADCFE;d=0x10325476;xl=x.length;for(k=0;k<xl;k+=16){AA=a;BB=b;CC=c;DD=d;a=_FF(a,b,c,d,x[k+0],S11,0xD76AA478);d=_FF(d,a,b,c,x[k+1],S12,0xE8C7B756);c=_FF(c,d,a,b,x[k+2],S13,0x242070DB);b=_FF(b,c,d,a,x[k+3],S14,0xC1BDCEEE);a=_FF(a,b,c,d,x[k+4],S11,0xF57C0FAF);d=_FF(d,a,b,c,x[k+5],S12,0x4787C62A);c=_FF(c,d,a,b,x[k+6],S13,0xA8304613);b=_FF(b,c,d,a,x[k+7],S14,0xFD469501);a=_FF(a,b,c,d,x[k+8],S11,0x698098D8);d=_FF(d,a,b,c,x[k+9],S12,0x8B44F7AF);c=_FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);b=_FF(b,c,d,a,x[k+11],S14,0x895CD7BE);a=_FF(a,b,c,d,x[k+12],S11,0x6B901122);d=_FF(d,a,b,c,x[k+13],S12,0xFD987193);c=_FF(c,d,a,b,x[k+14],S13,0xA679438E);b=_FF(b,c,d,a,x[k+15],S14,0x49B40821);a=_GG(a,b,c,d,x[k+1],S21,0xF61E2562);d=_GG(d,a,b,c,x[k+6],S22,0xC040B340);c=_GG(c,d,a,b,x[k+11],S23,0x265E5A51);b=_GG(b,c,d,a,x[k+0],S24,0xE9B6C7AA);a=_GG(a,b,c,d,x[k+5],S21,0xD62F105D);d=_GG(d,a,b,c,x[k+10],S22,0x2441453);c=_GG(c,d,a,b,x[k+15],S23,0xD8A1E681);b=_GG(b,c,d,a,x[k+4],S24,0xE7D3FBC8);a=_GG(a,b,c,d,x[k+9],S21,0x21E1CDE6);d=_GG(d,a,b,c,x[k+14],S22,0xC33707D6);c=_GG(c,d,a,b,x[k+3],S23,0xF4D50D87);b=_GG(b,c,d,a,x[k+8],S24,0x455A14ED);a=_GG(a,b,c,d,x[k+13],S21,0xA9E3E905);d=_GG(d,a,b,c,x[k+2],S22,0xFCEFA3F8);c=_GG(c,d,a,b,x[k+7],S23,0x676F02D9);b=_GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);a=_HH(a,b,c,d,x[k+5],S31,0xFFFA3942);d=_HH(d,a,b,c,x[k+8],S32,0x8771F681);c=_HH(c,d,a,b,x[k+11],S33,0x6D9D6122);b=_HH(b,c,d,a,x[k+14],S34,0xFDE5380C);a=_HH(a,b,c,d,x[k+1],S31,0xA4BEEA44);d=_HH(d,a,b,c,x[k+4],S32,0x4BDECFA9);c=_HH(c,d,a,b,x[k+7],S33,0xF6BB4B60);b=_HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);a=_HH(a,b,c,d,x[k+13],S31,0x289B7EC6);d=_HH(d,a,b,c,x[k+0],S32,0xEAA127FA);c=_HH(c,d,a,b,x[k+3],S33,0xD4EF3085);b=_HH(b,c,d,a,x[k+6],S34,0x4881D05);a=_HH(a,b,c,d,x[k+9],S31,0xD9D4D039);d=_HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);c=_HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);b=_HH(b,c,d,a,x[k+2],S34,0xC4AC5665);a=_II(a,b,c,d,x[k+0],S41,0xF4292244);d=_II(d,a,b,c,x[k+7],S42,0x432AFF97);c=_II(c,d,a,b,x[k+14],S43,0xAB9423A7);b=_II(b,c,d,a,x[k+5],S44,0xFC93A039);a=_II(a,b,c,d,x[k+12],S41,0x655B59C3);d=_II(d,a,b,c,x[k+3],S42,0x8F0CCC92);c=_II(c,d,a,b,x[k+10],S43,0xFFEFF47D);b=_II(b,c,d,a,x[k+1],S44,0x85845DD1);a=_II(a,b,c,d,x[k+8],S41,0x6FA87E4F);d=_II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);c=_II(c,d,a,b,x[k+6],S43,0xA3014314);b=_II(b,c,d,a,x[k+13],S44,0x4E0811A1);a=_II(a,b,c,d,x[k+4],S41,0xF7537E82);d=_II(d,a,b,c,x[k+11],S42,0xBD3AF235);c=_II(c,d,a,b,x[k+2],S43,0x2AD7D2BB);b=_II(b,c,d,a,x[k+9],S44,0xEB86D391);a=addUnsigned(a,AA);b=addUnsigned(b,BB);c=addUnsigned(c,CC);d=addUnsigned(d,DD);}
var temp=wordToHex(a)+wordToHex(b)+wordToHex(c)+wordToHex(d);return temp.toLowerCase();}
function sha1(str){var rotate_left=function(n,s){var t4=(n<<s)|(n>>>(32-s));return t4;};var cvt_hex=function(val){var str="";var i;var v;for(i=7;i>=0;i--){v=(val>>>(i*4))&0x0f;str+=v.toString(16);}
return str;};var blockstart;var i,j;var W=new Array(80);var H0=0x67452301;var H1=0xEFCDAB89;var H2=0x98BADCFE;var H3=0x10325476;var H4=0xC3D2E1F0;var A,B,C,D,E;var temp;str=this.utf8_encode(str);var str_len=str.length;var word_array=[];for(i=0;i<str_len-3;i+=4){j=str.charCodeAt(i)<<24|str.charCodeAt(i+1)<<16|str.charCodeAt(i+2)<<8|str.charCodeAt(i+3);word_array.push(j);}
switch(str_len%4){case 0:i=0x080000000;break;case 1:i=str.charCodeAt(str_len-1)<<24|0x0800000;break;case 2:i=str.charCodeAt(str_len-2)<<24|str.charCodeAt(str_len-1)<<16|0x08000;break;case 3:i=str.charCodeAt(str_len-3)<<24|str.charCodeAt(str_len-2)<<16|str.charCodeAt(str_len-1)<<8|0x80;break;}
word_array.push(i);while((word_array.length%16)!=14){word_array.push(0);}
word_array.push(str_len>>>29);word_array.push((str_len<<3)&0x0ffffffff);for(blockstart=0;blockstart<word_array.length;blockstart+=16){for(i=0;i<16;i++){W[i]=word_array[blockstart+i];}
for(i=16;i<=79;i++){W[i]=rotate_left(W[i-3]^W[i-8]^W[i-14]^W[i-16],1);}
A=H0;B=H1;C=H2;D=H3;E=H4;for(i=0;i<=19;i++){temp=(rotate_left(A,5)+((B&C)|(~B&D))+E+W[i]+0x5A827999)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=20;i<=39;i++){temp=(rotate_left(A,5)+(B^C^D)+E+W[i]+0x6ED9EBA1)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=40;i<=59;i++){temp=(rotate_left(A,5)+((B&C)|(B&D)|(C&D))+E+W[i]+0x8F1BBCDC)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=60;i<=79;i++){temp=(rotate_left(A,5)+(B^C^D)+E+W[i]+0xCA62C1D6)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
H0=(H0+A)&0x0ffffffff;H1=(H1+B)&0x0ffffffff;H2=(H2+C)&0x0ffffffff;H3=(H3+D)&0x0ffffffff;H4=(H4+E)&0x0ffffffff;}
temp=cvt_hex(H0)+cvt_hex(H1)+cvt_hex(H2)+cvt_hex(H3)+cvt_hex(H4);return temp.toLowerCase();}
function stripslashes(str){return(str+'').replace(/\\(.?)/g,function(s,n1){switch(n1){case'\\':return'\\';case'0':return'\u0000';case'':return'';default:return n1;}});}
function trim(str,charlist){var whitespace,l=0,i=0;str+='';if(!charlist){whitespace=" \n\r\t\f\x0b\xa0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000";}else{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 urldecode(str){return decodeURIComponent(str.replace(/\+/g,'%20'));}
function urlencode(str){str=(str+'').toString();return encodeURIComponent(str).replace(/!/g,'%21').replace(/'/g,'%27').replace(/\(/g,'%28').replace(/\)/g,'%29').replace(/\*/g,'%2A').replace(/%20/g,'+');}
function utf8_encode(argString){var string=(argString+'');var utftext="";var start,end;var stringl=0;start=end=0;stringl=string.length;for(var n=0;n<stringl;n++){var c1=string.charCodeAt(n);var enc=null;if(c1<128){end++;}else if(c1>127&&c1<2048){enc=String.fromCharCode((c1>>6)|192)+String.fromCharCode((c1&63)|128);}else{enc=String.fromCharCode((c1>>12)|224)+String.fromCharCode(((c1>>6)&63)|128)+String.fromCharCode((c1&63)|128);}
if(enc!==null){if(end>start){utftext+=string.substring(start,end);}
utftext+=enc;start=end=n+1;}}
if(end>start){utftext+=string.substring(start,string.length);}
return utftext;}
function in_array (needle, haystack, argStrict) {
    // Checks if the given value exists in the array  
    // 
    // version: 1004.2314
    var key = '', strict = !!argStrict; 
    if (strict) {
        for (key in haystack) {
            if (haystack[key] === needle) {
                return true;            }
        }
    } else {
        for (key in haystack) {
            if (haystack[key] == needle) {                return true;
            }
        }
    }
     return false;
}
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)
    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
}