define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported¶
Description¶
The third argument of define() used to allow the creation of a case-insensitive global constant. The constant in the code would have been accessible with A or a, without distinction. This feature has been deprecated in PHP 7.3 and abandoned in PHP 8.0. For backward compatibility, the third argument is not reported as an error, but a warning. The constant is not case insensitive any way. Adding a fourth argument is a fatal error, and has no meaning.
Example¶
<?php
define('A', 'b', true);
?>
Solutions¶
Remove the third argument in the define() call.
In more recent PHP versions, this error message is now define(): Declaration of case-insensitive constants is deprecated.