Re: [PHP-DEV] [RFC] Add is_assoc_array() function

[Ben Ramsey]

On 2/20/26 20:35, Muhammed Arshid KV wrote:

Hi internals,

I’ve proposed a small RFC to add *is_assoc_array(array $array):* bool to
the PHP core.

RFC: https://wiki.php.net/rfc/is_assoc_array

The function detects associative arrays using internal storage
*(HT_IS_PACKED)*.

Similar helpers exist in frameworks, and a native version would be faster
and more consistent.

No BC breaks. No impact on SAPIs or OPcache.

Feedback welcome.

Thanks,
Muhammed Arshid

    PHP_FUNCTION(is_assoc_array)
    {
        HashTable *array;

        ZEND_PARSE_PARAMETERS_START(1, 1)
            Z_PARAM_ARRAY_HT(array)
        ZEND_PARSE_PARAMETERS_END();

        RETURN_BOOL(!zend_array_is_list(array));
    }





Cheers,
Ben

Your implementation is pretty much the inverse of `zend_array_is_list()`,[^1] so you could probably simplify it with the following (note the negation operator (`!`) in front of `zend_array_is_list(array)`. For the sake of consistency, I would change the name of the function to `array_is_assoc()`. [^1]: https://github.com/php/php-src/blob/da6d890e00d56fd0d842e844aeac03baf7e47f17/Zend/zend_hash.h#L1602-L1633

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