无法加载PDF文档。 不想使用任何其他插件期望iframe或嵌入HTML5

Question

I just want to embed a PDF document. Don't want to use any plugin or Google documents.

<?php
    $var = $_GET['var'];
    ?>
<embed src="<?php echo $var;?>" type="application/pdf" width="100%" height="600px">

output of $var is studentsassignments/Bill_2.pdf output like