程嶏清单8-7.txt

< linux网络编程工具>>配套源码

$string = "This is what you have";
$first  = substr($string, 0, 1);  # "T"
print $first,"\n";
$start  = substr($string, 5, 2);  # "is"
print $start,"\n";
$rest   = substr($string, 13);    # "you have"
print $rest,"\n";
$last   = substr($string, -1);    # "e"
print $last,"\n";
$end    = substr($string, -4);    # "have"
print $end,"\n";
$piece  = substr($string, -8, 3); # "you"
print $piece,"\n";