PHP Fatal error: Unsupported operand types in For Loop

Question

I got an Error in my For Loop for some reason. I just want to go backwards through an array in php.

The Error in my Browser is:

Fatal error: Unsupported operand types in /var/html/modules/getChat.php on line 18

Line 18 in this Code part line 1:

Here is the Code:

for($x = sizeof($result-1); $x > 0; $x--)
{
    echo '<div class="message '.$result[$x].'"> <img src="'.$result[$x].'" /><span class="name">'.$result[$x].'</span>
    <p>'.$result[$x].'</p>
    </div>';
}

I hope you can help

Thanks

Thanks a lot i fixed it with sizeof($result) - 1 it was a stupid fault too — Koslov
– Koslov, Commented Feb 14, 2017 at 17:36

raina77ow · Accepted Answer · 2017-02-14 17:39:33Z

1

$result is an array, and substracting 1 from an array doesn't make any sense. You probably wanted to use this instead:

for ($x = sizeof($result) - 1; $x > 0; $x--) // ...

And yes, it seems that you unintentionally skip the very first element of your array here. If so, fix the condition ($x >= 0) - or just compact the whole loop into while:

$x = count($result);
while($x--) {
  // output with $result[$x]
}

If that's not a bottleneck (and most probably it's not), you better show the real intent of the code with array_reverse:

 foreach (array_reverse($result) as $el) {
    // output with $el
 }

edited Feb 14, 2017 at 17:39

answered Feb 14, 2017 at 17:31

raina77ow

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1 Comment

u_mulder Over a year ago

Also x > 0 will not use first element of array. Maybe OP intends to do so, but still.

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