How to return array of C++ objects from a PHP extension
- by John Factorial
I need to have my PHP extension return an array of objects, but I can't seem to figure out how to do this.
I have a Graph object written in C++. Graph.getNodes() returns a std::map<int, Node*>. Here's the code I have currently:
struct node_object {
zend_object std;
Node *node;
};
zend_class_entry *node_ce;
then
PHP_METHOD(Graph, getNodes)
{
Graph *graph;
GET_GRAPH(graph, obj) // a macro I wrote to populate graph
node_object* n;
zval* node_zval;
if (obj == NULL) {
RETURN_NULL();
}
if (object_init_ex(node_zval, node_ce) != SUCCESS) {
RETURN_NULL();
}
std::map nodes = graph-getNodes();
array_init(return_value);
for (std::map::iterator i = nodes.begin(); i != nodes.end(); ++i) {
php_printf("X");
n = (node_object*) zend_object_store_get_object(node_zval TSRMLS_CC);
n-node = i-second;
add_index_zval(return_value, i-first, node_zval);
}
php_printf("]");
}
When i run php -r '$g = new Graph(); $g->getNodes();' I get the output
XX]Segmentation fault
meaning the getNodes() function loops successfully through my 2-node list, returns, then segfaults. What am I doing wrong?
