PHP-如果echo $ _GET ['q']; 空添加此TEXT

Question

this is my code

amzn_assoc_default_search_phrase = "<?php error_reporting(0); echo $_GET['q'];?>";

and if $_GET['q'] is empty, add my text example: perfume how i can do this ?

Thank you. I hope i get help this time.

Answer 1

First off, don't turn error_reporting() off. That's a bad idea since it will be pretty hard for you to debug your code later on if there are other errors/issues.

If you're using a PHP version older than PHP 7, you can use isset() :

<?= isset($_GET['q']) ? $_GET['q'] : 'perfume' ?>

If you're using PHP 7+, you can use the new shorter null coalescing operator ( ?? ) syntax that does the same:

<?= $_GET['q'] ?? 'perfume' ?>

Answer 2

Ignoring the strange stuff in front of your PHP code before the equal sign change this

<?php error_reporting(0); echo $_GET['q'];?>

to

<?php 
error_reporting(0); 
echo (empty($_GET['q']) ? 'perfume' : $_GET['q']);
?>

Answer 3

If $_GET['q'] is set but empty, you can use the empty ternary operator:

<?php echo $_GET['q'] ?: 'perfume'; ?>

If $_GET['q'] is not set, you can use the null coalesce operator:

<?php echo $_GET['q'] ?? 'perfume'; ?>