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c - Conditions for usage of FREE_ZVAL and zval_ptr_dtor in php extension?

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Release： 2016-09-14 09:41:20

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<code>zval *z;
MAKE_STD_ZVAL(z);
ZVAL_STRING(z, "this is a test", 0);

zval_ptr_dtor(&z); 
//这里会报错
 Program received signal SIGSEGV, Segmentation fault.
0x000000000067a01d in zval_delref_p (pz=0x7ffff063f323) at /vagrant_data/php-5.6.25/Zend/zend.h:411
411        return --pz->refcount__gc;
</code>

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<code>zval *z;
MAKE_STD_ZVAL(z);
ZVAL_STRING(z, "this is a test", 0);

zval_ptr_dtor(&z); 
//这里会报错
 Program received signal SIGSEGV, Segmentation fault.
0x000000000067a01d in zval_delref_p (pz=0x7ffff063f323) at /vagrant_data/php-5.6.25/Zend/zend.h:411
411        return --pz->refcount__gc;
</code>

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