(PHP 4 >= 4.1.0)
sem_remove() removes the semaphore sem_identifier if it has been created by sem_get(), otherwise generates a warning.
Returns TRUE on success or FALSE on failure.
After removing the semaphore, it is no more accessible.
See also: sem_get(), sem_release() and sem_acquire().
Note: This function does not work on Windows systems. It was added on PHP 4.1.0.
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