Update README.md

correct spelling of "exert"
Merge pull request #106 from EagleEyeJohn/patch-1

Update README.md
Fix destruction order in zend_shutdown (bug #65463, #66036)

If Apache or a similar SAPI receives a signal during PHP processing
it calls zend_shutdown() without calling shutdown_executor().
	#65463: If a module like Gearman or Memcached is loaded,
in the unfixed version it is unloaded by zend_destroy_modules() before the
CG(CLASS_TABLE) is destructed. When CG(CLASS_TABLE) is destructed,
any pointers to methods (specifically around destruction) in the unloaded
module's .so are now dangling and the process segfaults.
	#66036: Any subclasses of an internal class like ArrayObject need
to be destructed in order: subclass first and then the internal class. In the
unfixed version zend_shutdown() clears the CG(CLASS_TABLE) from the head
of the list onwards, so internal classes are destructed first and user-defined
classes last. Internal classes are alloc/deallocated with malloc/free while
user-defined classes with emalloc/efree. If there's shared data between them
then efree() could be called instead of free() leading to a seg-fault.
Fix typo from commit 32314f6b6
Return FALSE on bit shift by negative number
Fixed 64-bit tests
Fixed 32-bit test
Prevent bit shift count wrapping quirkiness on some CPUs for right shift
Updated >> 64-bit tests
Cast NaN and Infinity to zero
Prevent bit shift count wrapping quirkiness on some CPUs for left shift
Updated << 64-bit tests
Updated 32-bit << test
Use zend_ polyfilled nan/finite, check finite
Only destruct if EG(active) in zend_shutdown(). (bug #65463, #66036)
Fix bug #67922
Fix comparison in case of constant NULL as default value

Fixes "Fatal error: Default value for parameters with a class type hint
can only be NULL in ext/phar/phar.php on line 1120" whie creating phar.phar
resource type is int
Keep folder mark style in this file
use zend_string_equals_ci