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Date: Sun, 1 Nov 2009 22:48:24 +0000
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To: Mark Skilbeck <markskilbeck@gmail.com>
Subject: Re: [PHP-DEV] Seg fault when using active_symbol_table called from userspace function.
From: scott@macvicar.net (Scott MacVicar)

On 1 Nov 2009, at 21:41, Mark Skilbeck wrote:

> Scott MacVicar wrote:
>> On 1 Nov 2009, at 21:09, Mark Skilbeck <markskilbeck@gmail.com>  
>> wrote:
>>> [snip]
>> There is no symbol table as there are no variables. You should  
>> check if it's NULL before using zend_hash_exists.
>> Scott
>
> Hi, Scott. I'm having trouble - I added the check to see if the  
> symbol table i available, yet it returns false even if I have added  
> variables within the function:
>
> [code]
> PHP_FUNCTION(sample_var_a_exists)
> {
> 	if (!EG(active_symbol_table) ||
> 			!zend_hash_exists(EG(active_symbol_table), "a", sizeof("a"))) {
> 		RETURN_BOOL(0);
> 	}
> 	RETURN_BOOL(1);
> }
> [/code]
>
> [code]
> $a = '';
> var_dump(sample_var_a_exists());
>
> function x() {
> 	$a = ''; // Add a symbol to the hash table.
> 	var_dump(sample_var_a_exists()); // Shows bool(false)
> }
>
> x();
> [/code]
>
> -- 

You probably want the following to build the symbol table.

	if (!EG(active_symbol_table)) {
		zend_rebuild_symbol_table(TSRMLS_C);
	}

Scott