You want to
extract part of a string, starting at a particular place in the string. For
example, you want the first eight characters of a username entered into a
form.
Extracting a substring with substr(
)
<?php $substring = substr($string,$start,$length); $username = substr($_GET['username'],0,8); ?>
If $start and $length are positive, substr( ) returns $length characters in the string, starting at $start.
If $start is bigger than the length of the string,
substr( ) returns false..