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Plesk doesnt ship clients PHP, it only downloads it from original OS vendor repo and it is quite likely it may be outdated there. If your OS comes with PHP 5.4, then Plesk would run PHP 5.4 for clients.
You also wanna keep in mind that Linux distributions backport security patches to the "old" versions they maintain for their users.
I wouldn't recomend compiling PHP from source on a production envoirment, as it increases the risk that you miss important security updates that otherwise would have come on your machine with a regular yum/aptitude update.