[SOLVED] How can one catch a "Notice: Undefined offset:"

[bluebutterflyofyourmind]

I'm running a loop but eventually I get to a point where i get the error "Notice: Undefined offset:"  is there a way to catch this error as it happens and then exit the loop acordingly with out actually hitting the error?

[phpSensei]

Can you post the code please?

[bluebutterflyofyourmind]

k it's  a bit messy rigt now from bug testing but here it is

 

                $y = 1;
	$x = 0;
	$tempCount = 'x';
	$prev = 'y';

	$hostPortion = explode(".", $hostName);

	while($x != 1){
		echo $prev." = prev before equal tempcount <BR>";
		echo $tempCount." = tempcount before equal prev <BR>";

		$prev = $tempCount;

		echo $prev." = prev after equal tempcount <BR>";
		echo $tempCount." = tempcount after equal prev <BR><BR>";


		if($hostPortion == false){
			echo "hostportion was false and is now exiting the loop";
			$x = 1;
			$count = $y;

		}
		else{
			$tempCount = $hostPortion[$y];
		}
		echo "host portion after false if = ".$hostPortion[$y]."<BR>";
		echo $x." = x after false if statement <BR><BR>";

		echo $tempCount." = tempcount after = host protion <BR><BR>";

		echo $prev." = prev before if <BR>";
		echo $tempCount." = tempcount before if <BR>";
		echo $x." = x before if statement <BR>";
		/*
		if($prev == $tempCount){

			$count = $y;
			$x = 1;
		}
		*/

		echo $x." = x after if statement <BR><BR>";

		$y++;
		echo $y." = y at end of loop<BR>";
	}



	echo $hostPortion[$count]."<BR><BR>";

[phpSensei]

which line does the error occur in?

[bluebutterflyofyourmind]

if($hostPortion == false){
			echo "hostportion was false and is now exiting the loop";
			$x = 1;
			$count = $y;

		}
		else{
			$tempCount = $hostPortion[$y];
		}
		echo "host portion after false if = ".$hostPortion[$y]."<BR>";

 

when it try's to use $hostPortion[$y]

 

pretty much it's getting to the number 6.  but that's an error but it still has to run that sixth time in order to make $prev = $tempCount

 

sorry if this is a bit confusing

[bluebutterflyofyourmind]

the problem with the code just above is that it's not returning false.....just notifying.

 

what i'm trying to do overall is determine what the ending of the host name of a user is....ie.  .com  .ca .org  excetera. 

 

since all host name seem to have a different number of .'s i need to run the loop an unknown amount of time to find the last one.  at which point i'm getting the notify error

[derwert]

You can stop the notice by checking if the variable is set first before using it.

If you want to do it inline you can use the ternary operator,

 

<?php
echo "host portion after false if = ".(isset($hostPortion[$y]) ? $hostPortion[$y] : '')."<BR>";
?>

 

But the way you're going about this is more than you need.

The below code will give you the TLD of the host.

 

<?php

$host = 'www.example.com';
echo substr($host,  strrpos($host, '.'));

?>

[bluebutterflyofyourmind]

hey thanks.  the first bit of code you gave did'nt work, but suggestion on how to do it worked well.  may i ask exactly what it's doing when i say   

 

echo substr($hostName, strrpos($hostName, '.'));

 

 

thanks

[derwert]

• strrpos — Find position of last occurrence of a char in a string.(http://www.php.net/manual/en/function.substr.php)
  
• substr — Return part of a string.(http://www.php.net/manual/en/function.strrpos.php)
  

 

See the links for more information on the parameters.