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Languages :: PHP :: counter in php
By: irish_paddy U.S.A.  Date: 22/04/2003 00:00:00  English  Points: 50 Status: Answered
Quality : Excellent
Hello

Is there anyway I can set up a counter in php so that it initally is set to zero in a php webpage
and then is incremented by one each time that webpage is opened up. I want to then reset the counter when the user clicks on a specified button.

Cheers
By: VGR Date: 22/04/2003 21:29:00 English  Type : Comment
yes. Use a session variable.

This way, only the "surveyed" page has to have session_start(); at the beginning, the others don't need it.

something like :

<?php
session_start();
if (action_button) $_SESSION['sess_counter']=0; // write the action the usual way for you, like $_POST['clear'] where 'clear' would be the name of a type=submit button in a method=post FORM...

// else { ? // that's if you want to start over at 0 really, or 1 (because you are on the page again, after all)

$_SESSION['sess_counter']++;

// } // has to do with the else above
?>
By: ThG Date: 22/04/2003 21:31:00 English  Type : Comment
do you have any database support?
you may do it with to queries:
"update set hits=hits+1 where page_id=$my_page_id"
and
"update set hits=0 where page_id=$my_page_id"

otherwise you should use a text file containing only the number:

function increment_counter() {
$fd = fopen("count.txt", "r");
$count = fgets($fd);
$count = $count + 1;
fclose($fd);
$fd = fopen("count.txt", "w");
fputs($fd, $count);
fclose($fd);
}
By: ThG Date: 22/04/2003 21:32:00 English  Type : Comment
damn, VGR arrived first :)
but my solution is better than his, especially if the counter has to be global for all users opening that page, and not for only that user..
By: irish_paddy Date: 22/04/2003 21:39:00 English  Type : Comment
Cheers, just somethin on security im just after discoverin, its completley unrelated. Do you know how I can hide certain pages from users depending on what value I assign them in a "access" row in a mysql database.

I'll increase the points.

Thanks
By: ThG Date: 22/04/2003 21:45:00 English  Type : Comment

hmm i would suggest something like this:

$min_level = 5; // minimum level to access this page.

include("check_level.inc.php");


inside that file:

//query your database and store the result in $user_level

if ($user_level < $min_level) {
print "<h2>you don't have access to this page</h2>\n";
}
By: VGR Date: 22/04/2003 21:46:00 English  Type : Comment
of course you can.

-in the "users" table, you set up "levels"
-when the user connects (login), you recover those values from the DB and set up session variables for them
-on entry of each page, you check the session variables for that user (you for sure have his pseudo/login, his opreferences for display, now you'll have his "level")
-and you write :
<?php
$threshold=3; // example, this varies with the page
if ($_SESSION['userlevel']<$threshold) Header("Location: index.php"); // thrown out
// else continue and display the page...
?>
By: irish_paddy Date: 22/04/2003 21:50:00 English  Type : Comment
ok, ill try that.

On the previous question, Can I put the count value in a php variable.

$count = $_SESSION['sess_counter']++;

Would this work?
By: VGR Date: 22/04/2003 21:55:00 English  Type : Comment
yes, of course

then you would use the (incremented) variable $count in the page , right ?

it will be easier to display than $_SESSION['sess_counter'] ;-)
By: VGR Date: 22/04/2003 21:55:00 English  Type : Comment
sorry, but you'll have the unincremented value doing this.
By: irish_paddy Date: 22/04/2003 21:59:00 English  Type : Comment
ok, see im creating a unique table in a mysql database everytime the suer clicks a certain button.
wil the query "create table tablename$_SESSION['sess_counter']++" work?
By: ThG Date: 22/04/2003 22:06:00 English  Type : Comment
yes... provided that you fix the syntax to
"create table tablename" . $_SESSION['sess_counter']++ . " (other data..);"
By: VGR Date: 22/04/2003 22:09:00 English  Type : Comment
it's definitely better to separate things...

$_SESSION['sess_counter']++;
$counter=$_SESSION['sess_counter'];
"create table tablename$counter;"
By: irish_paddy Date: 23/04/2003 21:43:00 English  Type : Comment
I was trying that, Is this the correct way to link the button to the php file?



<center>
<FORM METHOD="LINK" name = form ACTION="new.htm">



<INPUT TYPE="submit" VALUE="Create New Timetable" onClick="javascript:sendform()">
</center>
</FORM>

session_start();
if(form) $_SESSION['sess_counter']=0;
{

$_SESSION['sess_counter']++;

}
By: VGR Date: 23/04/2003 22:47:00 English  Type : Answer
yes and no

you could as well do it the "normal way" :

---- in the page with the buttons (they may be the same "new.htm" )



<center>
<FORM METHOD=POST ACTION=new.htm>



<INPUT TYPE=submit NAME=form VALUE="Create New Timetable">
</FORM>
</center>

------- in new.htm now :
<?php
session_start();
if ($_POST['form']) $_SESSION['sess_counter']=0;
else $_SESSION['sess_counter']++;
$locCounter=$_SESSION['sess_counter']; // for local use
?>
here HTML output with value of the counter = <? echo $locCounter;?>
By: irish_paddy Date: 24/04/2003 21:54:00 English  Type : Comment
Is there any way I can increment the counter and load another html page by pressing the same button once?

Again cheers.
By: VGR Date: 24/04/2003 22:03:00 English  Type : Comment
Of course there is, but for me to answer, I need to better understand what exactly you're trying to do ;-)

1) how many pages ?
2) where is this button ?
3) how to select the next page ?
4) relation between counter and other page ?

the way it was asked, the counter is linked to a specific page and is reset when the client presses "the button"
By: irish_paddy Date: 24/04/2003 22:14:00 English  Type : Comment
ok, heres what im trying to do

When the user clicks on a "create" button, the counter is incremented in a different php file and a tablename with the counter number is made in the database in that same php file. Clicking the "create" button also links the user to a different ".htm" page.

Thats it really...
By: VGR Date: 24/04/2003 22:27:00 English  Type : Comment
not understood

php files : "a diferent" + "the same"
I also thought that the "create" button reset the counter to zero
"a counter is incremented..." : a counter of what ?

and towards which page is the user supposed to be redirected ? Always the same page ?
By: irish_paddy Date: 24/04/2003 22:32:00 English  Type : Comment
I am fairly bad at explainin what I wanna do.

When the user clicks the "create" button below the php code is executed which is in a different "php" file.

I just want to link the user to another "htm" page while at the same time executing the "php" file.
Is that any clearer?



<center>
<FORM METHOD=POST ACTION=new.htm>



<INPUT TYPE=submit NAME=form VALUE="Create">
</FORM>
</center>

<?php
session_start();
if ($_POST['form']) $_SESSION['sess_counter']=0;
else $_SESSION['sess_counter']++;
$locCounter=$_SESSION['sess_counter']; // for local use
?>
here HTML output with value of the counter = <? echo $locCounter;?>
By: VGR Date: 24/04/2003 23:21:00 English  Type : Comment
you can't but you can :D

1) add a hidden field "desturl" in the FORM
and in the php script, test $_POST['desturl'] and do :
Header('Location: '.$_POST['desturl']);

2) the same, but with the desturl in the action= part of the form, like : <FORM METHOD=POST ACTION=new.htm?desturl=...>
Then treat it as $_GET['desturl'] in the receiving php script

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