$$a = "12str"+8;

echo $$a;

?>

$$a = 8;

$$a++;

echo $a++;

?>

$$b=201;

$$c=40;

$$a=$$b>$$c?4:5;

echo $$a;

?>

$$a=true;

$$b=true;

$$c=false;

if($$a or $$b and $$c)

echo "true";

else echo "false";

?>

a=true;

b=100;

echo $$a+$$b;

?>

if($$a=='a'){

somefunction();

}

else if($$a=='b'){

anotherfunction(); }

else if($a=='c'){

dosomething(); }

else{

donothing(); }

?>

$$sum=0;

for($$i=10;$$i>=1;$$i--) {

if($$i%21=0) {

break; }

$$sum=$$sum + $$i; }

echo $sum; ?>