[RESOLVED] Uninitialized string offset

nadirah81

Hi....

I have a code that looks like this:

$k = "abcdef";
$length = strlen($k);

for ($a=$length; $a>=0; $a--)
{echo "$a[$k]";
}

When I run this code on Windows, it works fine. It echoed out fedcba, but when I run in on Linux, before it echoed out, it stated "Uninitialized string offset ........".

Why does this happen? Anyone..??

mrhappiness

$length = strlen($k) - 1;

use this and check it out

btw: to access a single char use $a{zero based index}

Weedpacket

Originally posted by nadirah81
When I run this code on Windows, it works fine. It echoed out fedcba, but when I run in on Linux, before it echoed out, it stated "Uninitialized string offset ........".

As mrhappiness pointed out, the last character is not the $length. The reason for the different behaviours is nothing to do with the operating system, but with the level at which PHP has had its error reporting set (it's higher on your Linux machine). The error occurred in both, but you weren't told about it on your Windows box.

Installer

I'm perplexed that the code worked at all on Windows (or any OS). On, for example, the first time through the loop you're telling PHP to echo "the 'abcdef'th value in '0'". Huh?

This code will reverse the string, if that's what you're trying to do:

for ($a = $length - 1; $a >= 0; $a--) {
    echo $k{$a}; 
}

laserlight

If the OP really did want to find a way to reverse a string (instead of just investigating an anomaly), [man]strrev/man would be the way to go.

nadirah81

yup.... thanks.

strrev is the one that i'm looking for. simple and easy. however, thanks to others who have given me alternative ideas. Thanks guys... 😉