Description:
------------
The call in the example of ignore_user_abort() has no arguments
so it won't do anything but return the current value.
cf. ext/standard/basic_functions.c

the following lines

// Ignore user aborts and allow the script
// to run forever
ignore_user_abort();

should be

// Ignore user aborts and allow the script
// to run forever
ignore_user_abort(1);