Description:
------------
(Sorry, I didn't know which type of bug to file this as.)

I'm writing a php extension in C++.  I would like to call html_entity_decode() right from C++.  Looking in the source, I see that html_entity_decode() is just a wrapper around php_unescape_html_entities().  Alas, this function is not mentioned in the ext/standard/html.h header file.

This feature request is that the declaration of the php_unescape_html_entities() function be put in the ext/standard/html.h header file.

I *do* have a work-around for this.  If I declare the function myself, than I can use it.  This works well, but is probably bad practice.

Reproduce code:
---------------
#include "ext/standard/html.h"
char *old, *new;
int new_len;
old = estrdup("a&b");
new = php_unescape_html_entities(
   (unsigned char *) old, strlen(old), &new_len, 1,
   ENT_COMPAT, NULL TSRMLS_CC
);
printf("old[%s]  new[%.*s]", old, new_len, new);

Expected result:
----------------
old[a&b]  new[a&b]

Actual result:
--------------
won't compile:
implicit declaration of function `int php_unescape_html_entities(...)'