The scope of a constant is already global, so just use them as they are:
define('VAR1', 'xxxxxxxxxx');
define('VAR2', 'xxxxxxxxxx');
define('VAR3', 'xxxxxxxxxx');
function myFunction()
{
echo VAR1;
// I need to access VAR1, VAR2, VAR3 here
}
$output = myFunction();
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solved How to use DEFINE vars inside functions