INPUT
$x = 'y';
$$x = 10;
echo $y * 2;

OUTPUT
$x = 'y';
$y = 10;
echo 20;

INPUT
$s = "abc";
$s[0] = 0;
echo $s;

OUTPUT
$s = "abc";
$s[0] = 0;
echo "0bc";

INPUT
$a = [];
$a[] = "abc";
echo $a[0];

OUTPUT
$a = [];
$a[] = "abc";
echo "abc";

INPUT

$obj = new stdClass();
$obj->foo = 'bar';
echo '' . $obj->foo;

OUTPUT

$obj = new stdClass();
$obj->foo = 'bar';
echo "bar";

INPUT

$a = "base64_decode";
$b = $a("YmFzZTY0X2RlY29kZQ==");
${$b("dGhlQ29kZQ==")} = "VGVzdA==";

function test() {
    global $b, $theCode;
    echo "{$b("$theCode")} 123\n";

}

test();

OUTPUT

$a = "base64_decode";
$b = "base64_decode";
$theCode = "VGVzdA==";
function test()
{
    global $b, $theCode;
    echo "Test 123\n";
}
test();

INPUT

$test = 'abc';
echo $test;
for ($i = 0; $i < 10; $i++) {
    $arr[$i] = $i;
    $arr[2] = 100;
    $temp = "a";
    $b = $temp;
    echo "$b";
    echo "$j";
    echo "{$arr[$i]}";
}
$a = array(1, 2,3);
$a[0] = $a[2];
echo "$b" . "$temp" . "$a" .  "$i" . "$test";
echo "$test";

OUTPUT

$test = 'abc';
echo "abc";
for ($i = 0; $i < 10; $i++) {
    $arr[$i] = $i;
    $arr[2] = 100;
    $temp = "a";
    $b = $temp;
    echo "a";
    echo "{$j}";
    echo "{$arr[$i]}";
}
$a = array(1, 2, 3);
$a[0] = $a[2];
echo "{$b}" . "{$temp}" . "Array" . "{$i}" . "{$test}";
echo "{$test}";

INPUT

namespace NS;
echo __LINE__;
echo __FILE__;
echo __DIR__;

function func() {
    echo __FUNCTION__;
}

class Foo {
    function bar() {
        echo __CLASS__;
        echo __METHOD__;
        echo __NAMESPACE__;
        echo __FUNCTION__;
    }
}
trait T {
    function f() {
        echo __TRAIT__;
        echo __NAMESPACE__;
        echo __CLASS__;
    }
}

OUTPUT

namespace NS;

echo 3;
echo "/var/www/html/testcase.php";
echo "/var/www/html";
function func()
{
    echo "NS\\func";
}
class Foo
{
    function bar()
    {
        echo "NS\\Foo";
        echo "NS\\Foo::bar";
        echo "NS";
        echo "bar";
    }
}
trait T
{
    function f()
    {
        echo "NS\\T";
        echo "NS";
        echo __CLASS__;
    }
}