You can able to see the current PHP version in WordPress admin dashboard widget.
Plugin Tag: server
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WP Server Health Stats
Monitor your WP site the right way with most important stats like Database, PHP details, PHP Memory, RAM Usage, CPU load, Server Uptime & more.
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WP-ServerInfo
Display your host's PHP, MYSQL & memcached (if installed) information on your WordPress dashboard.
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WP-Memory-Usage
Show up the PHP version, memory limit and current memory usage in the dashboard and admin footer. Optional monitor threshold and alert via email.
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Display PHP Version
Displays the currently installed PHP/MySQL version in the "At a Glance" admin dashboard widget.
