define()¶
define() is a PHP function, that introduces constant definitions.
define() is a function, and may be called anywhere. It is slower than const, as it is only executed at runtime. define() doesn’t allow class constants creation.
define() used to create case-insensitive constant, but this was abandoned in PHP 7.3.
<?php
define('HELLO', 'Hello');
print HELLO . " world\n";
?>
