[PHP-DEV] Hashtables

[John Coggeshall]

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;

Anyone know the steps I need to do in order for something like this to
work? If it hasn't been initialized, how do I tell other than checking
the elements?

John


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Re: [PHP-DEV] Hashtables

[Derick Rethans]

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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 Derick Rethans http://derickrethans.nl/ 
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