Looking at a random selection of packages I have on a machine, there are quite a few things that depend on the "php" package. For example on an FC6 system:
# rpm -q --whatrequires php php-pear-1.4.9-4 php-pear-DB-1.7.6-7.fc6 php-pear-PHPUnit-1.3.2-1.fc6 squirrelmail-1.4.10a-1.fc6 php-adodb-4.94-1.fc6 mantis-1.0.8-1.fc6 php-devel-5.1.6-3.6.fc6
Should these in general not be dependent on php-common rather than php, since "php" now basically contains just Apache HTTPD-related stuff?
(php-adodb should probably also only have an indirect dep via php(abi), which is provided by php-common; I haven't checked if that's different in fc7/devel)
Tim