It should surprise no one that the use of PHP is growing in enterprise environments. I’m not suggesting that PHP is replacing other “enterprise-class” technologies. Rather, PHP is being used as part of the enterprise IT bag of tricks. Sometimes when you’re digging a hole, you need a shovel, other times you need a backhoe. Let your job dictate the tools you use.
PS: James pointed out the availability of PHP for Z/OS on alphaworks.