$stringvar = "aby";
$stringvar++;
print $stringvar; # abz
$stringvar = "acz";
$stringvar++;
print $stringvar; # ada 进一位了
$stringvar = "AGZZZ";
$stringvar++; # $stringvar now contains "AHAAA"
$stringvar = "bc999";
$stringvar++; # $stringvar now contains "bd000"
如果字符串中含有非字母且非数字的字符,或数字位于字母中,则经过++运算前值转换为数字零,因此结果为1,如:
$stringvar = "ab*c";
$stringvar++; #1
$stringvar = "ab5c";
$stringvar++; #1
字符串联结和重复操作符
联接: .
重复:x
联接且赋值(类似+=): .=
例:
$newstring = "potato" . "head";
$newstring = "t" x 5;
$a = "be";
$a .= "witched"; # $a is now "bewitched"