Use jquery+php to display current online users

Using the jquery framework, Ajax calls Current Online users

function Updateonline () {

1. if (arguments[0]==true) {
2. $.ajax ({
3. URL: ' Ajax.php?do=updateonline ',
4. Type: ' Get ',
5. Success:function () {
6. $ (' #updateonline '). html (Arguments[0])
7. }
8. }
9. );
10. }else{
11. $.ajax ({url: ' ajax.php?do=updateonline ', type: ' Get '});
12. }
13. }
    

This updateonline is the ID of the div. There is also the call to this function!

1. $ (document). Ready (function () {
2. Updateonline (TRUE);
3. Window.setinterval ("Updateonline (True)", 60000);
4. });
   

Here is the service-side processing code:

2. $Now =time ();
4. $FileName = ' online.xml ';
6. $XML =new DOMDocument;
8. $XML->load ($FileName);
10. $Items = $XML->getelementsbytagname ("item");
12. $I = 0;
14. $AddXML =true;
16. foreach ($Items as $Item) {
18. $IP = $Item->childnodes->item (0)->nodevalue;
20. $Time = $Item->childnodes->item (1)->nodevalue;
24. if ($IP ==getip ()) {
26. $AddXML =false;
28. }
30. if ($IP ==@$_session[' IP ']) {
32. $XML _online= $XML->getelementsbytagname ("Online")->item (0);
34. $XML _online_item_select= $XML->getelementsbytagname ("Item")->item ($I);
36. $XML _online_item= $XML->createelement ("Item");
38. $NewIP = $XML->createelement ("IP", $IP);
40. $XML _online_item->appendchild ($NewIP);
42. $NewTime = $XML->createelement ("Time", $Now);
44. $XML _online_item->appendchild ($NewTime);
46. $XML _online->replacechild ($XML _online_item, $XML _online_item_select);
48. $XML->save ($FileName);
50. }
52. if (Round ($Now-$Time)/60) >1) {
54. $Item = $XML->documentelement->getelementsbytagname ("Item")->item ($I);
56. $XML->documentelement->removechild ($Item);
58. $XML->save ($FileName);
60. }
62. $I + +;
64. }
66. if ($AddXML) {
68. $XML->formatoutput = true;
70. $XML _online= $XML->getelementsbytagname ("Online")->item (0);
72. $XML _online_item= $XML->createelement ("Item");
74. $XML _online_item_ip= $XML->createelement ("IP", GetIP ());
76. $XML _online_item->appendchild ($XML _online_item_ip);
78. $XML _online_item_time= $XML->createelement ("Time", $Now);
80. $XML _online_item->appendchild ($XML _online_item_time);
82. $XML _online->appendchild ($XML _online_item);
84. $XML->save ($FileName);
86. $_session[' IP ']=getip ();
88. }
90. if ($Items->length==0) {
92. echo ' 1 ';
94. }else{
96. Echo $Items->length;
98. }
100. Unset ($Now, $FileName, $XML, $Items, $I, $AddXML);
     

The session is used to store IP addresses to differentiate users.

The following is an XML file

1. <?xml version= "1.0" encoding= "Utf-8"?>
2. <online>
3. <item><ip>127.0.0.1</ip><time>1232254720</time></item>
4. </online>