如何在PHP中回显字符串常量时删除警告

Question

I declared a string constant named LABTITLE. When I tried to echo it in the title tag and run the code, the title of the webpage shows a warning. Is there something wrong with my code?

Our professor specifically instructed to print the Title in this way.

The Title tag:

<title>
    <?php
    echo constant("LABTITLE");
    ?>
</title>

The PHP code:

<?php
define("LABTITLE", "Laboratory Activity No. 2");
?>

Then whenever I run, this shows in the Title tab:
: constant(): Couldn't find constant LABTITLE in on line

Answer 1

Define Your constant first then you can get value. looks like you are using constant value before you define.

<?php
define("LABTITLE", "Laboratory Activity No. 2");
?>
<title>
    <?php
    echo constant("LABTITLE");
    ?>
</title>

Answer 2

Instead you could directly use

<title>
    <?php
    echo LABTITLE;
    ?>
</title>

given following is included.

<?php
define("LABTITLE", "Laboratory Activity No. 2");
?>