You can allow it by using setsebool -P httpd_unified=1
Normal SELinux settings for http to work with PHP more or less properly are:
setsebool -P httpd_enable_cgi on
setsebool -P httpd_unified on
setsebool -P httpd_builtin_scripting on
Otherwise you can use
getsebool -a | grep httpd
To get a list of httpd-related EeLinux options and tweak to your personal taste.