This is part of getting rid of the “Headers already sent” error in PHP. See https://stackoverflow.com/a/8028987.
Documentation for the phptags tag tidier is here.
admins-iMac-3:~ bill$ phptags --warn -v /Users/bill/VirtualBox\ VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/unused/filemanager/ext/jupload/jupload.php: TRAILING whitespace ("?>\n")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/unused/filemanager/class/FM_ExpFolder.php: TRAILING whitespace ("?>\n")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/bbpress/content-single-topic.php: Consecutive open+close tags with spacing (template?) ("?>\n\n\t<?")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/bbpress/form-reply.php: Consecutive open+close tags with spacing (template?) ("?>\n\n<?")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/bbpress/loop-single-reply.php: Consecutive open+close tags with spacing (template?) ("?>\n\n\t\t<?")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/bbpress/form-topic.php: Consecutive open+close tags with spacing (template?) ("?>\n\n<?")
/Users/bill/VirtualBox VMs/vagrant-2/www/chaco/chaco_htdocs/wp-content/themes/wfs2_child1/bbpress/content-single-forum.php: Consecutive open+close tags with spacing (template?) ("?>\n\n\t<?")
admins-iMac-3:~ bill$
To edit php.ini file on VM…
sudo nano /etc/php/7.3/cli/php.ini