I am working on a PHP page which can be reached through logging in another index page. This PHP page then starts a session and it displays data from MySQL onto a table.
I am trying to add a filter dropdown box, which can query certain data form table depending on the item selected. This requires the page to get refreshed and come up with certain data from the table.
But once I select an option, the PHP page goes white and nothing comes up. But when I goto this page straightaway without logging in, and by commenting out the session commands like “session_start()” and all, the page can display the data based upon the selection in the dropdown box.
So can anyone tell me how to stop this issue, or if you think there is something wrong with the way I found out the cause of the issue, then please notify that as well. Please let me know if you need more details.
After logging in through index page, the user is shown a page with dropdown box having three items. Based on the selection the appropriate PHP page is displayed. This page that shows the dropdown box for selection has the code in short as follows:
if ($selected_view == 'A')
include 'A.php';
else if ($selected_view == 'B')
include 'B.php';
else if($selected_view == 'C')
include 'C.php';
I am currently working on the C one, so when I select the C it goes to the PHP page having the following code in short:
<?php
session_start();
if ( $_SESSION['usertype'] == 'Admin')
//the following variables hold the firstname and lastname of the logged in user. This can be used to append with the notes the user adds
{
$user = $_SESSION['firstname']." ".$_SESSION['lastname'];
…
My code that I added for adding the dropdown box is as follows: Note-> this code is a simple one and it worked when I created a sample PHP page and ran it:
<script language="JavaScript" type="text/JavaScript">
function formSubmit()
{
document.getElementById("report_filter").submit();
}
</script>
<form method="post" id="report_filter" action="" >
<select name="try" onchange="formSubmit();">
<option value="all"> All </option>
<option value="Windows"> Windows </option>
<option value="Win 2008"> Win 2008 </option>
<option value="Win 7"> Win 7 </option>
<option value="Win Vista"> Win Vista </option>
<option value ="Linux"> Linux </option>
<option value = "Win 7/Linux"> Win 7/Linux </option>
</select>
</form>
Since I am in the beginning stage, I am just echoing the option that I select in the dropdown box as follows:
<?php
// I just echo "none" in the beginning, and after a selection is made in te dropdown it should display "ok <the item selected>"
if(!(isset($_POST["try"])))
echo "none";
else
echo "ok ".$_POST["try"];
But when I make a selection the page goes white and blank.
So I commented out the “session_start();” and other session related commands I saw and ran this page by directly going to it in the browser, instead of navigating through the index page.
In that case, when I make a selection in the dropdown the “ok <item>” is getting displayed.
Please let me know if you need more information/code.
session-start() is in the start of the page I am working on. But I have pasted all my code in the links as I mentioned in a comment here. Can you tell me in which code the “session-start()” should be there?
Please note that the doctype is your friend and guide to minimise browser conflicts.
All browsers are coded differently but all follow the w3.org standards. BIG problems arise when the errors and warnings occur because the coding team does not have standards to follow. No doubt heated discussions have eventually decided on how the coder’s browser should handle the discrepancies. Also no doubt a time consuming long series of tests also occur to guess a best match.
I included the script at the top of “admin_c1.php” and the following errors were shown:
// admin_c1.php
Parse error: syntax error, unexpected '*' in E:\\xamp-lite\\xampp\\htdocs\\godaddy\\ci_john\\downloads\\sp-a\\learner101\\admin_c1.php on line 771
The faulty script:
// line 769
$host="***";
$username=****;
$password=****;
$database=****;
$connection=mysql_connect(***,***<***);
mysql_connect($host,$username,$password);
@mysql_select_db($database) or die( "Unable to select database");
// line 777
Once you have rectified the script test the MySQL connection success using: mysql_error()
Is this showing error in the mysql connections? I actually put ‘*’ in the hostname, username and password, since I was running this in my localhost. If you really want to test it you can include the sql credentials of a sql db which is in your laptop
OK I tested the script and had to modify to remove errors, etc, so made the following changes:
// remmed the following lines at the bottom of the script because easier to test then exit; on failure
/*
# < ?php
# } // line 984 approximately
# else
# echo "You are not authorized to use this website. Try to obtain the necessary rights to use it!";
*/
// added these lines at the top of the script
<?php /* admin_c1.php */
session_start();
error_reporting(-1);
ini_set('display_errors',1);
ini_set('error_log', '.\\__________ERROR_LOG.PHP');
// include 'THIS-IS-A-TEST-TO-SEE-IF-THE-_____ERROR_LOG_____.PHP IS WORKING';
// the following variables hold the firstname and lastname of the logged in user.
// This can be used to append with the notes the user adds
// $_SESSION['usertype'] = 'admin';
// $_SESSION['firstname'] = 'John';
// $_SESSION['lastname'] = 'Betong';
if ( ! isset($_SESSION['usertype']) )
{
echo "You are not authorized to use this website. Try to obtain the necessary rights to use it!";
exit;
}
$user = $_SESSION['firstname']." ".$_SESSION['lastname'];
require 'connect_sql.php';
$recent_ID_query = mysql_query("SELECT MAX(ID) FROM c1_report");
...
...
...
I did as you said but I couldnt find out the error log file.
The following is the code I used as you mentioned:
<?php
session_start();
display_errors = On;
error_reporting(E_ALL);
ini_set('display_errors',1);
ini_set("log_errors", 1);
ini_set('error_log', dirname(__FILE__) .'\\ERROR_LOG.PHP');
if ( ! isset($_SESSION['usertype']) =='LG Admin')
{
echo "You are not authorized to use this website. Try to obtain the necessary rights to use it!";
exit;
}
//session_start();
//if ( $_SESSION['usertype'] == 'LG Admin')
//if(true)
//the following variables hold the firstname and lastname of the logged in user. This can be used to append with the notes the user adds
//{
$user = $_SESSION['firstname']." ".$_SESSION['lastname'];
require 'connect_sql.php';
$recent_ID_query = mysql_query("SELECT MAX(ID) FROM centrify_report");
..
I then went to php.ini and I removed the ‘;’ in front of the lines:
display_errors
Default Value: On
Development Value: On
Production Value: On
error_reporting
Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
Development Value: E_ALL
Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT
log_errors
Default Value: On
Development Value: On
Production Value: On
track_errors
Default Value: On
Development Value: On
Production Value: On
error_log = php_errors.log
Please learn how to wrap your scripts in PHP brackets.
In order to get your error_log file working try this:
// file “Test.php”
<?php /* admin_TEST.php */
echo __FILE__;
// PREVENT ERRORS FROM SHOWING A BLANK SCREEN
/* # gradually move this line down until errors appear
require '_function_show_setup.php';
_show_setup();
*/
die;
<form method=“post” id=“report_filter” action=“” >
<select name=“try” onchange=“formSubmit();”>
<option value=“all”> All </option>
<option value=“Windows”> Windows </option>
<option value=“Win 2008”> Win 2008 </option>
<option value=“Win 7”> Win 7 </option>
<option value=“Win Vista”> Win Vista </option>
<option value =“Linux”> Linux </option>
<option value = “Win 7/Linux”> Win 7/Linux </option>
</select>
</form>
</td>
</tr>
<?php
if(!(isset($_POST[“try”])))
echo “none”;
else
echo "ok ".$_POST[“try”];
…
?>
When I select the combo box option the page goes white instead of echoing the option selected, so I thought this is where I am supposed to paste the code. Is this correct?
After doing that I saw the yellow box appearing in my page as the picture I have attached here. Please let me know what I did wrong here.
Please learn how to wrap your scripts in PHP brackets. To start enclose PHP in square brackets, paste your code then close the script with /PHP inside square brackets.
I find difficulty in trying to see where the file starts and finishes, also the filename and does it start with the <?PHP
Please supply the complete file or a link to the file and I will try to get it to remove errors by uploading the file to my site.
*** If programming was easy then everybody would be doing it
Finally comes the code that I have been working on.This will be huge with many different CSS and javascript functions that my team members have worked on. They all work fine and I dont think you have to care about them. You can see the part I was trying to work on from the line 751, where I added a dropdown box.
You can then see the line 772, where I am trying to echo “none” or the option that I select in the dropdown box. You can then see that I included the code you gave me to show the error in the lines 777-779.
This code is called “admin_c1.php” and can be found in the link:
As before when I selected an option in the dropdown box the page went white, and I did saw that the file “ERROR_LOG.php” being created. But I couldnt see any help with its contents being created. They were like:
[24-Jan-2013 20:00:10 UTC] PHP Warning: highlight_file(C:\webserver\www\proj-12-20\ERROR_LOG.PHP): failed to open stream: No such file or directory in C:\webserver\www\proj-12-20\_function_show_setup.php on line 32
[24-Jan-2013 20:00:10 UTC] PHP Warning: highlight_file(): Failed opening ‘C:\webserver\www\proj-12-20\ERROR_LOG.PHP’ for highlighting in C:\webserver\www\proj-12-20\_function_show_setup.php on line 32
So I think I am making mistake in calling the function you gave me. Please let me know what I should do, also please let me know if you need more info.
The error file is now working and can be called from index-001.php
All javascript has been disabled and the submit button now calls “login_authentication.php”.
I have spent a lot of time removing errors but have also left numerous other for you to become familiar with debugging
I think JavaScript is a luxury and best if disabled. Get the form to do what you want it to do. Once satisfied then add JavaScript to do the clever stuff.
Also notice the source files are available in learner101.zip
