in fact it is just for a subfolder that I need to change the php version there would be no way to change via a .htaccess
To make a long story short an old php site inserted in a wordpress everything works very well in php5.6 but I would like to put the wordpress part in php7.3.16 and leave the part inserted in php5.6
the .htaccess I tested all that I know and find on the net no way that the sub-folder is in a different version
thank you