Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Illegal string offset Warning PHP

Posted on 2015-02-22
8
Medium Priority
?
630 Views
Last Modified: 2015-03-11
Hi,

I keep getting Illegal string offset Warning PHP, I know its connected with an array, how can I improve the query so ot to get the warning?

<br /><b>Warning</b>:  Illegal string offset 'username' in <b>C:\xampp\htdocs\mySeatXT\web\includes\users_form.inc.php</b> on line <b>24</b><br /><br /><b>Notice</b>:  Uninitialized string offset: 0 in <b>C:\xampp\htdocs\web\includes\users_form.inc.php</b> on line <b>24</b><br />


case 'user_data':
$result = query("SELECT userID,username,realname,password,email,role,property_id,active,confirm_code,last_ip,last_login,created,modified
      FROM `plc_users`
WHERE `userID` ='%d'
      LIMIT 1",$_SESSION['userID']);
      return getRowListarray($result);
break;
0
Comment
Question by:hellblazeruk
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 44

Expert Comment

by:Chris Stanyon
ID: 40624371
I can't see anything in that code that causes the error. I'm guessing the error is coming from your getRowListarray() function, so we'd need to see that. Also, what exactly is your query() function doing. That doesn't seem part of standard PHP, so I'm guessing it's your own function - again, may need to see that.
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 40624390
Usually when you get a PHP message, you get a line number with it.  It looks like maybe that is line 24 in these messages.  What does that line contain?  Also, have you used var_dump() to print out the contents of the variables that are used in that line?
0
 
LVL 34

Expert Comment

by:Slick812
ID: 40624416
I'd try and use the PHP  sprintf( ) , usually if it talks about string offset it' got something to do the string formatting?
case 'user_data':
$sql = sprintf("SELECT userID,username,realname,password,email,role,property_id,active,confirm_code,last_ip,last_login,created,modified
      FROM `plc_users`
WHERE `userID` ='%d'
      LIMIT 1", $_SESSION['userID']);

$result = query($sql);
      return getRowListarray($result);
break; 

Open in new window

0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 111

Expert Comment

by:Ray Paseur
ID: 40624435
Here is a code simulation that will trigger one of the messages.  It happens because PHP allows the same notation for strings and arrays - square brackets on the end of the variable name.  Possibly the script assumes it is going to get an array variable, but it got a string variable instead?  That might happen with an error message.

<?php // temp_hellblazeruk.php

/**
 * See http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/Q_28622093.html
 *
 * Warning:  Illegal string offset 'username' in C:\xampp\htdocs\mySeatXT\web\includes\users_form.inc.php on line 24
 * Notice:  Uninitialized string offset: 0 in C:\xampp\htdocs\web\includes\users_form.inc.php on line 24
 */
error_reporting(E_ALL);

// SET UP THE NECESSARY CONFUSION
$str = 'ABC';
$str[0] = NULL;
var_dump($str);

// TRY TO USE 'username' AS A STRING INDEX
echo $str['username'];

Open in new window

0
 

Author Comment

by:hellblazeruk
ID: 40624510
line 24
is
            <input type="text" name="username" id="username" class='required' minlength='10' maxlength='30' title=' ' value="<?php echo $row['username'];?>"/>
users-form.inc.php
0
 
LVL 34

Expert Comment

by:Slick812
ID: 40624524
that PHP starts out with -

if ($_SESSION['button']==2 || $_SESSION['page'] == 7) {
      $row = ""; // ERROR is HERE
}

where the $row is set to an empty string, you CAN not use that $row String variable like -
    $row['username'];

you will need to Exit the page so there are no <form> written with the $row['username'];

OR

create a Default $row array with all of the array parts like 'username' and 'email', so there can be something to use the $row array
0
 
LVL 44

Expert Comment

by:Chris Stanyon
ID: 40624561
There are a couple of points in your code that have the capacity for failure. The error you're getting is because $row['username'] doesn't exist. This could be caused by $row being set to "" or by your querySQL() function not returning what you expect.

Because you never quite know what $row is, you should ensure that you check it before trying to use it. In your particular case, something like this:

<input type="text" name="username" id="username" class='required' minlength='10' maxlength='30' title=' ' value="<?php echo (isset($row['username'])) ? $row['username'] : ""; ?>"/>

Open in new window


The echo statement now uses a ternary operator, which checks if $row['username'] is set. If it is, then it gets used. If it isn't then an empty string is echoed - no more errors.
0
 
LVL 111

Accepted Solution

by:
Ray Paseur earned 2000 total points
ID: 40624563
Suggest you add error_reporting(E_ALL) to the top of your PHP scripts.  A correctly written script will never rely on an undefined variable, and E_ALL will help you avoid that.  It will raise a Notice message at run-time if the script uses an undefined variable.  In this case, it would have given you a little more information about the $row variable, including the name of the variable that was causing trouble.
0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

These days socially coordinated efforts have turned into a critical requirement for enterprises.
There are times when I have encountered the need to decompress a response from a PHP request. This is how it's done, but you must have control of the request and you can set the Accept-Encoding header.
The viewer will learn how to count occurrences of each item in an array.
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
Suggested Courses

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question