PHP list() error: "Undefined offset"

Question

I am dealing with a system which sends any unexpected errors back to me in a string with the error type, message, and details, for example:

      Error Type - Database
      Error Message - Error Executing Database Query.
      Error Detail - [Macromedia][SQLServer JDBC Driver][SQLServer]String or binary data would be truncated.

Now to create a better UI I am expected to deal with these errors, so I thought about explode(), and found this user's response in the PHP Manual which helped me delimit the results with two delimiters instead of just one:

Then I needed to get a little deeper into the code because I wanted $key => $val pairs, so I came across this answer on StackOverflow.

Then I combined both and came across this solution:

private function string_to_array( $delimiters, $string )
{
    // start by replacing the $delimiters
    $ready = str_replace( $delimiters, $delimiters[0], $string );
    
    // create new list() item:
    // $key => $value
    list( $err_typ,     $err_typ_cont,
          $err_mess,    $err_mess_cont,
          $err_det,     $err_det_cont ) = explode( $delimiters[0], $ready ); # line 238
    
    $result[ trim( $err_typ ) ]     = trim ( $err_typ_cont );
    $result[ trim( $err_mess ) ]    = trim ( $err_mess_cont );
    $result[ trim( $err_det ) ]     = trim ( $err_det_cont );
    
    return $result;
}

To call the functions I am using array('-', PHP_EOL) as $delimiters and the $string is the error message as a string

It worked really well when I inserted a random error into a string and called the function. However, when I trigger a random error from the server, I start to run into issues, specifically, Undefined offset for my list() function

PHP error

<br />
<b>Notice</b>:  Undefined offset: 5 in <b>C:\xampp\htdocs\application\_backend\class\class.program.php</b> on line <b>238</b><br />
<br />
<b>Notice</b>:  Undefined offset: 4 in <b>C:\xampp\htdocs\application\_backend\class\class.program.php</b> on line <b>238</b><br />

Also, note that the array comes all weird and wrong:

Response in an array format

Array
(
    [Error Type] => Database
          Error Message
    [Error Executing Database Query.
          Error Detail] => [Macromedia][SQLServer JDBC Driver][SQLServer]String or binary data would be truncated.
    [] => 
)

This is the same error as I can see above.

How can I fix that? What am I missing here?

I can only imagine that the content of $ready from adjusting $string actually cannot explode into 6 items... like the delimiters are not matching up. Can you print_r() both of those before the explode to debug what they think they have? — IncredibleHat
– IncredibleHat, Commented Nov 7, 2017 at 21:09
@Randall actually I can: Error Type - Database Error Message - Error Executing Database Query. Error Detail - [Macromedia][SQLServer JDBC Driver][SQLServer]String or binary data would be truncated. — sam
– sam, Commented Nov 7, 2017 at 21:11
I'm thinking what PHP_EOL thinks is the return, is not what is in the $string, thus its just not str_replacing them with dashes? — IncredibleHat
– IncredibleHat, Commented Nov 7, 2017 at 21:12
The API you're using is presumably not written in PHP, so it doesn't use the same newline convention as PHP does. — Barmar
– Barmar, Commented Nov 7, 2017 at 21:16

Barmar · Accepted Answer · 2017-11-07 21:18:52Z

2

The system you're dealing with apparently uses a different newline character than the system running the PHP script. I suggest you handle all types of newlines:

$delimiters = array('-', "\r\n", "\n", "\r");

answered Nov 7, 2017 at 21:18

Barmar

789k57 gold badges554 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

IncredibleHat Over a year ago

Add "chr(13)" to the end of that array. And also for precaution run this after str_replace: $string = preg_replace("/(-){2,}/","-",$string); to truncate multiple dashes into 1.

Collectives™ on Stack Overflow

PHP list() error: "Undefined offset"

PHP error

Response in an array format

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

PHP error

Response in an array format

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related