How are semaphores enabled in php 5.3?

Solution Verified - Updated -

Issue

  • How are semaphores enabled in php 5.3?
  • In php 5.1.6 semaphores were automatically enabled; however, after upgrading to 5.3 these appear to be disabled.

Environment

  • Red Hat Enterprise Linux 5
    • php 5.1.6
    • php 5.3.3
  • Red Hat Enterprise Linux 6
    • php 5.3.3

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