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php-developer-list | 2002112

Re: [PHP-DEV] Hashtables From: Derick Rethans (derick <email protected>)
Date: 11/30/02

On Sat, 30 Nov 2002, John Coggeshall wrote:

>
> Hey all
>
> I was playing around and I'm running into a problem with a hashtable...
> Basically, it's segfaulting my code :) Specifically, I'm trying to
> return the number of items in the hash...
>
> if(zend_hash_num_elements(hash) == 0)
>
> Which causes the following:
>
> Program received signal SIGSEGV, Segmentation fault.
> zend_hash_num_elements (ht=0x0) at /home/php/php4/Zend/zend_hash.c:988
> 988 return ht->nNumOfElements;

You need to check if your ht actually is initialized, at the moment it
is NULL, and if you want to dereference that, you get a segfault.

if (!hash || (zend_hash_num_elements(hash) == 0)) {
}

should work.

Derick 

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