I don't see what is wrong with this array read

[KenHorse]

    $handle = fopen("/etc/rpt.fifo", "r") or die("Unable to open file!");
       $buffer = trim(fgets($handle));                
       $ary = explode (",", $buffer);  
       $x = $ary[2];
       print $x;
       flush();   
       pclose($handle);

        

When I run it, it reports:

Notice:  Undefined offset: 2 on line 4

This is the line in /etc/rpt.fifo that is being read (there are 4 indices)

20210721153256,1100,TXKEY,89790

The error makes no sense to me but I'm no expert <g>

Edited July 21, 2021 by KenHorse

[requinix]

1 hour ago, KenHorse said:

This is the line in /etc/rpt.fifo that is being read (there are 4 indices)

20210721153256,1100,TXKEY,89790

That's great and all, but what is the value of $buffer?

[KenHorse]

The line I posted is the contents of $buffer

 

20210721153256,1100,TXKEY,89790

[requinix]

https://3v4l.org/GH1pk
If $buffer was what you say it was then it should all work fine. But it does not work fine. So $buffer must be something else.

I know you think the contents of the file are that string, but have you checked literally what the value of $buffer is?

[KenHorse]

Yes, I agree and that's why I'm here! It should work but it doesn't.

and yes, I KNOW what's in $buffer as I if I place a print statement after the $buffer assignment, that line shows

 

VERY frustrating, yes

[kicken]

add var_dump($buffer, $ary); after your call to explode, maybe it'll shed some light on the situation?

Is this code being called multiple times?  Maybe the first time it has the data like you expect, but the second time $buffer is an empty string.