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uninitialized_zval appears in multiple places in the PHP kernel, but I don't know what it does. For example, in the ZEND_ASSIGN_DIM_SPEC_CV_UNUSED_OP_DATA_CONST_HANDLER handler:

            variable_ptr = zend_hash_next_index_insert(Z_ARRVAL_P(object_ptr), &EG(uninitialized_zval));

Why use uninitialized_zval? And when will use uninitialized_zval?

Nigel Ren
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hantao huang
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    uninitialized_zval is equal to null as stated in https://stackoverflow.com/questions/22456583/no-undefined-offset-if-array-is-null – Valentin Knyazev Apr 30 '19 at 09:14

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