My php code suddenly can't work in javascript code

Question

This is my code.

I don't know why it suddenly can't work today. As you see in the image the is light-blue, it should be dark-blue in visual stuido code.

Does anyone having the same issue?

Answer 1

You can try like below.

<?php
    echo "a";
?>
<script>
    alert(1);
    function test()
    {
        alert("<?php echo 1; ?>");
    }
    test();
</script>

Thanks.