How to catch this error: “Notice: Undefined offset

Question

I want to catch this error:

$a[1] = 'jfksjfks';
try {
      $b = $a[0];
} catch (\Exception $e) {
      echo "jsdlkjflsjfkjl";
}

Edit: in fact, I got this error on the following line: $parse = $xml->children[0]->children[0]->toArray();

Answer 1

You can't with a try/catch block, as this is an error, not an exception.

Always tries offsets before using them:

if( isset( $a[ 0 ] ) { $b = $a[ 0 ]; }

Answer 2

I know it's 2016 but in case someone gets to this post.

You could use the array_key_exists($index, $array) method in order to avoid the exception to happen.

$index = 99999;
$array = [1,2,3,4,5,6];

if(!array_key_exists($index, $array))
{
    //Throw myCustomException;
}

Answer 3

$a[1] = 'jfksjfks';
try {
  $offset = 0;
  if(isset($a[$offset]))
    $b = $a[$offset];
  else
    throw new Exception("Notice: Undefined offset: ".$offset);
} catch (Exception $e) {
  echo $e->getMessage();
}

Or, without the inefficiency of creating a very temporary exception:

$a[1] = 'jfksjfks';
$offset = 0;
if(isset($a[$offset]))
  $b = $a[$offset];
else
  echo "Notice: Undefined offset: ".$offset;

Answer 4

Im sure why the Error Throw but i fix some..

in html2pdf.class.php

on Lines 2132:

//FIX:
$ctop=$corr[$y][$x][2]<=count($sw)?$corr[$y][$x][2]:count($sw);
$s = 0; for ($i=0; $i<$ctop; $i++) {$s+= array_key_exists($x+$i, $sw)? $sw[$x+$i]:0;}

SAME On line 2138:

//FIX:

$ctop=$corr[$y][$x][2]<=count($sw)?$corr[$y][$x][2]:count($sw);
 for ($i=0; $i<$ctop; $i++) {

the problem the array $sw not have a key of $corr[$y][$x][2] so i fix the loop for to max count($sw) to fix .. I dont know if that create an another consecuense but i resolve my problem y dont have any more errors..

So i hope works to you ..!!! Beats Reguards

Answer 5

You need to define your custom error handler like:

<?php

set_error_handler('exceptions_error_handler');

function exceptions_error_handler($severity, $message, $filename, $lineno) {
  if (error_reporting() == 0) {
    return;
  }
  if (error_reporting() & $severity) {
    throw new ErrorException($message, 0, $severity, $filename, $lineno);
  }
}

$a[1] = 'jfksjfks';
try {
      $b = $a[0];
} catch (Exception $e) {
      echo "jsdlkjflsjfkjl";
}

Answer 6

Normally, you can't catch notices with try-catch block. But you can convert notices to exceptions! Use this way:

function get_notice($output)
{
    if (($noticeStartPoint = strpos($output, "<b>Notice</b>:")) !== false) {
        $position = $noticeStartPoint;
        for ($i = 0; $i < 3; $i++)
            $position = strpos($output, "</b>", $position) + 1;
        $noticeEndPoint = $position;
        $noticeLength = $noticeEndPoint + 3 - $noticeStartPoint;
        $noticeMessage = substr($output, $noticeStartPoint, $noticeLength);
        throw new \Exception($noticeMessage);
    } else
        echo $output;
}

try {
    ob_start();
    // Codes here
    $codeOutput = ob_get_clean();
    get_notice($codeOutput);
} catch (\Exception $exception) {
    // Catch (notice also)!
}

Also, you can use this function for to catch warnings. Just change function name to get_warning and change "<b>Notice</b>:" to "<b>Warning</b>:".

Note: The function will catch an innocent output that contains:

<b>Notice</b>:

But to escape from this problem, simply, change it to:

<b>Notice:</b>