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Reload PHP page if file exists or time is 9am

Posted on 2009-05-09
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Last Modified: 2012-05-06
Hi,

I need to add some code to the head of a PHP file. What it needs to do is to check every 10 minutes if a file located in the same folder i.e loadfile.txt - if the file exists then refresh the page. If it doesn't then check the time. If the time is 9am or 10am then reload the page. Basically this code needs to do a check against the time 9am or 10am and also if a file exists. If any of those parameters are correct then reload the page. It also needs to do these checks every 10 minutes or so, so it needs to loop?
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Question by:alex4544
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9 Comments
 
LVL 8

Expert Comment

by:MatthiasVance
ID: 24343271
The best way to do this is by using AJAX to get the time & check if the file exists, and reload your page accordingly.

Kind regards,

Matthias Vance
0
 
LVL 3

Expert Comment

by:khr2003
ID: 24343342
hi
Do you want the page to be refreshed when it is visited? if so, you can make a simple php function that checks the time of the server and do whatever you want with it. If not, then try to use the cron jobs in the c-panel, see this link for a good explanation:

http://www.trap17.com/index.php/cron-jobs-cron-jobs-cpanel_t6321.html
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LVL 2

Author Comment

by:alex4544
ID: 24343388
What I want is some code in the head of my document that checks the time and if a file exists and will refresh the page if the variables are fullfilled. I need the code to run every 10 minutes or so without refreshing the page so some kind of loop or similar would be good. If someone can show me how the code works in AJAX or another language then that is fine but the page needs to be in PHP
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LVL 8

Expert Comment

by:MatthiasVance
ID: 24343447
You can find more information about XmlHttpRequest here (also check the links section underneath):
http://www.w3schools.com/XML/xml_http.asp

Once you know how to get data from PHP pages using this, you can write a php script that checks if the page should be reloaded. ie: let it return 1 if the page should be reloaded. Compare this in your javascript and reload the page.

I hope this helps you in the right direction.

Kind regards,

Matthias Vance
0
 
LVL 1

Expert Comment

by:jimhap
ID: 24344965
Here is my PHP code. Save this as ajaxstatus.php.

This is the file that will be called by the web page (AJAX request).

Stay tuned for the next code (HTML AJAX integration)...
<?php
// Written by jimhap
// This is the file called by AJAX, returns 1 or 0
// if file exists or it is 9/10 AM.
 
// Variables - change to your needs
 
// File to check if it exists...
$FILE = "filename.txt";
 
if(file_exists($FILE)) {
  echo "1";
} else {
  if(date('h A') === '9 AM') {
    echo "1";
  } else {
    if(date('h A') === '10 AM') {
      echo "1";
    } else {
      echo "0";
  }
}

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LVL 1

Accepted Solution

by:
jimhap earned 680 total points
ID: 24344967
Oops, made a little mistake, this SHOULD be correct:
<?php
// Written by jimhap
// This is the file called by AJAX, returns 1 or 0
// if file exists or it is 9/10 AM.
 
// Variables - change to your needs
 
// File to check if it exists...
$FILE = "filename.txt";
 
if(file_exists($FILE)) {
  echo "1";
} else {
  if(date('h A') === '9 AM') {
    echo "1";
  } else {
    if(date('h A') === '10 AM') {
      echo "1";
    } else {
      echo "0";
    }
  }
}

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0
 
LVL 1

Expert Comment

by:jimhap
ID: 24345107
OK, add this into your page. If the page is PHP, add ?> before the HTML and
<? after the HTML to continue the PHP, if any.
<script language="javascript" type="text/javascript">
// Client script - access PHP file, get results, and determine if refresh
// or not.
 
// Get the HTTP Object
function getHTTPObject(){
if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
else if (window.XMLHttpRequest) return new XMLHttpRequest();
else {
alert("Your browser does not support AJAX.");
return null;
}
}
 
// Change the value of the outputText field
function checkOutput(){
if(httpObject.readyState == 4){
  if(httpObject.responseText == '1') {
    window.location.reload();
  }
}
}
 
// Implement business logic
 
function doWork(){
httpObject = getHTTPObject();
if (httpObject != null) {
httpObject.open("GET", "ajaxrequest.php, true);
httpObject.send(null);
httpObject.onreadystatechange = checkOutput;
}
 
// 10 minutes update
setTimeout ("doWork()", 600000);
 
}
 
var httpObject = null;
 
</script>

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0
 
LVL 1

Assisted Solution

by:jimhap
jimhap earned 680 total points
ID: 24345113
Oops, forgot to close quotes.

Updated client code (copy + paste to desired page):
<script language="javascript" type="text/javascript">
// Client script - access PHP file, get results, and determine if refresh
// or not.
 
// Get the HTTP Object
function getHTTPObject(){
if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
else if (window.XMLHttpRequest) return new XMLHttpRequest();
else {
alert("Your browser does not support AJAX.");
return null;
}
}
 
// Change the value of the outputText field
function checkOutput(){
if(httpObject.readyState == 4){
  if(httpObject.responseText == '1') {
    window.location.reload();
  }
}
}
 
// Implement business logic
 
function doWork(){
httpObject = getHTTPObject();
if (httpObject != null) {
httpObject.open("GET", "ajaxrequest.php", true);
httpObject.send(null);
httpObject.onreadystatechange = checkOutput;
}
 
// 10 minutes update
setTimeout ("doWork()", 600000);
 
}
 
var httpObject = null;
 
</script>

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0
 
LVL 2

Author Closing Comment

by:alex4544
ID: 31579738
thats excellent. I can read the code and see what is happening so I will make my changes now. Your a star :D
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