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last 3 chars

Posted on 2000-02-17
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Last Modified: 2010-03-05
how do i assign a new variable to be the last three characters of a variable

ie if $old is "hello.txt"
then $new becomes "txt"

thanks
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Question by:boofulls
3 Comments
 

Accepted Solution

by:
spreq earned 200 total points
ID: 2530734
1. get total character
2. simple mathematic to get location for the first of last three character
3. use substring

eg
$old = "hello.txt";
$long=length($old);   #total char
$FirstOfThree=$long-3;  #simple math
$new=substr($FirstOfThree,0,3); #get the last char



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Author Comment

by:boofulls
ID: 2530779
even though there was an error in the last line....;)
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LVL 85

Expert Comment

by:ozo
ID: 2533152
$new=substr($old,-3);  #unless what you really want are all characters after the last '.'
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