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Bug #74648 zend_read_static_property returns &NULL for extending classes
Submitted: 2017-05-24 14:33 UTC Modified: 2017-05-27 09:03 UTC
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: jurigag at gmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 7.0.19 OS: Ubuntu 14.04
Private report: No CVE-ID: None
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 [2017-05-24 14:33 UTC] jurigag at gmail dot com
When extending internal class which has defined static property with null value and accessing this static property in C code using zend_read_static_property there is value returned as &NULL in C code causing some comparisons to fail. Though value in php code of this static property is correctly returned as NULL.

This also happens for php 7.1 as well.

Test script:
In class init:

zend_declare_property_null(test3_test_ce, "someNull", sizeof("someNull")-1, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC TSRMLS_CC);

Access and dump it somewhere(in method for example, keep in mind you must extends class in php first):

zval *tmp = zend_read_static_property(ce, "someNull", sizeof("queryString")-1, (zend_bool) ZEND_FETCH_CLASS_SILENT); // here will be returned &NULL
php_var_dump(tmp, 1); // var dumps &NULL
if (Z_TYPE_P(tmp) == IS_NULL) // false


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 [2017-05-27 09:03 UTC]
-Status: Open +Status: Not a bug
 [2017-05-27 09:03 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

you should use ZVAL_DEREF to handle that
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