[2013-11-14 10:37 UTC] bwoebi@php.net

Description:
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Closures should be unregistrable too.

See also http://lxr.php.net/xref/PHP_TRUNK/ext/standard/basic_functions.c#5782

Test script:
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declare(ticks=1);
register_tick_function($closure = function () { echo "Tick!\n"; });
unregister_tick_function($closure);

Expected result:
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Tick!

// no error...

Actual result:
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Tick!
PHP Catchable fatal error:  Object of class Closure could not be converted to string in php shell code on line 1