Câu hỏi trắc nghiệm PHP

<?php $a=1; function test(){ echo "a=$a"; } test();?>

<?php FUNCTION TEST(){ echo 'HELLO WORLD!'; } test();?>

<?php $check='false'; if($check){ echo 'true'; } else{echo 'false';}?>

$var = '0';if ($var) { echo 'true';} else { echo 'false';}

$var = 1 / 2;

$a = array( 'a', 3 => 'b', 1 => 'c', 'd');

$a = array();if ($a == null) {  echo 'true';} else { echo 'false';}

if (null === false) { echo 'true';} else { echo 'false';}

<?php$RESULT = 11 + 011 + 0x11;echo "$RESULT";?>

$var = 'a';$VAR = 'b';echo "$var$VAR";

$a = array( null => 'a', true => 'b', false => 'c', 0 => 'd', 1 => 'e', '' => 'f');echo count($a);

class MyException extends Exception {}try { throw new MyException('Oops!');} catch (Exception $e) { echo "Caught Exception";} catch (MyException $e) { echo "Caught MyException";}

$a = 1;{ $a = 2;}echo $a;