How to detect IE in php and Javascript

In PHP

1. $chrome = 'https://www.google.com/chrome/browser/desktop';
2. if (preg_match('~MSIE|Internet Explorer~i', $_SERVER['HTTP_USER_AGENT']) ||
3.        (strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0; rv:11.0') !== false) ||
4.        (strpos($_SERVER['HTTP_USER_AGENT'], "Edge") == true)) {
5.         header('Location:'.$chrome);
6. }
7. else{
8.     // goto your page
9. }

In Javascript

1. // detect IE ersion
2. var IEversion = detectIE();
4. if (IEversion !== false) {
5.     alert('You are using IE'+IEversion);
6.     document.location.href = "https://www.google.com/chrome/browser/desktop/";
7. }
9. function detectIE() {
10.     var getAgent = window.navigator.userAgent;
12.     var msie = getAgent.indexOf('MSIE ');
13.     if (msie > 0) {
14.         return parseInt(getAgent.substring(msie+5, getAgent.indexOf('.', msie)), 10);
15.     }
17.     var trident = getAgent.indexOf('Trident/');
18.     if (trident > 0) {
19.         var rv = getAgent.indexOf('rv:');
20.         return parseInt(getAgent.substring(rv+3, getAgent.indexOf('.', rv)), 10);
21.     }
23.     var edge = getAgent.indexOf('Edge/');
24.     if (edge > 0) {
25.         return parseInt(getAgent.substring(edge+5, getAgent.indexOf('.', edge)), 10);
26.     }
28.     return false;
29. }