The home page for php.net currently doesn't indicate anything. Last update for the PHP.net was January 10th regarding the release of PHP versions 5.6.40, 7.1.26, 7.2.14 and 7.3.1.
PEAR is used by several PHP users and a popular source for installing PHP code that other PHP applications depend on.
The PEAR installer does include an optional GPG digital signing but this does not seem to be popularly used or mandated for inclusion on the PEAR hosting site.