What is PHP-FPM?

PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites.

These features include:

  • Adaptive process spawning (NEW!)
  • Basic statistics (ala Apache’s mod_status) (NEW!)
  • Advanced process management with graceful stop/start
  • Ability to start workers with different uid/gid/chroot/environment and different php.ini (replaces safe_mode)
  • Stdout & stderr logging
  • Emergency restart in case of accidental opcode cache destruction
  • Accelerated upload support
  • Support for a “slowlog”
  • Enhancements to FastCGI, such as fastcgi_finish_request() – a special function to finish request & flush all data while continuing to do something time-consuming (video converting, stats processing, etc.)
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