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To: Jan Gerritsen <jan.gerritsen@michel-consulting.de>
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Date: Fri, 03 Sep 2004 12:40:37 -0400
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Subject: Re: [PHP-DEV] Writeing OO exteions for PHP 4.3
From: john@coggeshall.org (John Coggeshall)

If I understand you correctly you can put this pointer inside of a
resource container and return the resource container to user space as
the return value from url_init(). Then, from url_set_string() you accept
the resource as a parameter and extract the pointer to your CPP instance
of whatever class.

John

On Fri, 2004-09-03 at 10:54, Jan Gerritsen wrote:
> Hello,
> 
> I want to write an OO extension in C++ for my PHP 4.3.8 under linux.
> 
> I have already written some extensions in C for my own purposes, which
> introduce new functions to PHP.
> Studying the sources of ext/standard/dir.c, ext/ming/ming.c and the
> tutorial from J Smith (http://bugs.tutorbuddy.com/phpcpp/phpcpp/) I got
> already this far:
> 
> I have managed to build and link the CPP sources as a shared object
> which can be loaded and called from PHP.
> I have introduced the new class to PHP using the following code in the
> PHP_MINIT_FUNCTION of my extension:
> 
> static zend_class_entry *url_class_entry_ptr;
> static int le_url;
> 
> function_entry url_class_functions[] = {
> 	PHP_FALIAS(url, url_init, NULL)
> 	PHP_FALIAS(set_string, url_set_string, NULL)
> 	{NULL, NULL, NULL}
> };
> 
> static ZEND_RSRC_DTOR_FUNC(destroy_url)
> {
>      if (rsrc->ptr) {
>          delete (Url_class*) rsrc->ptr;
>          rsrc->ptr = NULL;
>      }
> }
> PHP_MINIT_FUNCTION(url)
> {
> 	zend_class_entry url_class_entry;
> 	INIT_CLASS_ENTRY(url_class_entry, "url", url_class_functions);
> 	url_class_entry_ptr = zend_register_internal_class(&url_class_entry
> TSRMLS_CC);
> 
> 	le_url = zend_register_list_destructors_ex(destroy_url, NULL, "url",
> module_number);
> 
> 	return SUCCESS;
> }
> 
> This class can be created, and the functions (methods) can be called
> from PHP.
> Example:
> $url = new URL();
> $url->set_string("12345");
> 
> Now my problem is, how can I save the pointer of my C++ class, created
> in the url_init function, and restore it in the other functions/methods:
> PHP_FUNCTION(url_init)
> {
> 	Url_class * url = new Url_class;
> 	
> 	/ * code to save the address of url */
> }
> 
> PHP_FUNCTION(url_set_string)
> {
> 	Url_class *url = NULL;
> 
> 	/* code to fetch url */
> 	
> 	if( url != NULL ) {
> 		url->set_string(“test”);
> 		RETURN_TRUE;
> 	}
> 	RETURN_FALSE;
> }
> 
> I could not work out how to do this, by studying the code of the OO
> extensions I mentioned.
> Can someone give me a hint, ore some example code, how to do such things?
> 
> thanks
> Jan Gerritsen