Stretch 9.6 Apache2 2.4 cannot parse php files

[Nimant]

Hello,

while everything seems ok with the configuration files
/etc/apache2/mods-available/php7.2.conf
/etc/apache2/mods-enabled/php7.2.conf

and libapache2-mod-php7.2 is installed
this php file
<?php
print "Hello World<br>";
?>
is interpreted as pure html by apache2 displaying
";
?>

I purged and reinstalled apache2 and php7.2 without any result.
Any idea ?

[TonyT]

check the logs