Strange Substr Behavior

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I'm trying to cycle through a keyword printing out three character
groupings starting from each letter in the keyword.  Here is the script I
am using:


$searchWord = "acme corporation"

$chars = strlen($searchWord);

echo "$searchWord<br>";

for($i=0;$i<=$chars;$i++)
{
$j = $i + 3;
echo $i . ":" . $j . " ";
echo substr(($searchWord),$i,$j) . "<br>";
}

This is the output:
acme corporation
0:3 acm
1:4 cme
2:5 me co
3:6 e corp
4:7 corpor
5:8 corporat
6:9 orporatio
7:10 rporation
8:11 poration
9:12 oration
10:13 ration
11:14 ation
12:15 tion
13:16 ion
14:17 on
15:18 n
16:19

This doesn't make sense to me because it is returning more than 3
characters after the first two iterations.  I understand that I have to
modify the script near the end but I'm just trying to get the base concept
working first.

Here is the output I'm looking for:

acm
cme
mec
eco
cor
orp
rpo
por
ora
rat
ati
ion


Thanks,
ROn






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