$_ = 'somestring';
    `$_`;     // backticks are shell or exec(), $_ is the previous string.

type echo "'^#(/||/@!@[{@:^[-['^";@@@\\>])@."."{)/];)^{";$,+=(++$,);$_.=">&$," to see what it does

;$,+=(++$,); looks like a for loop

looks like php to me - backticks work in perl, bash and php