黑马php基础案例教程课后答案？

<?php $a = true; $b = 'hello'; $c = 12; $d = 12.988; var_dump($a); var_dump($b); var_dump($c); var_dump($d)

; //----------------分割线----------------- $name = 'hello'; print <<<EOT document EOT; unset($name); var_dump($name);