Storing zvals in hash tables in resources

I'm trying to store zvals in a hash table which is part of a resource. Unfortunately the zvals do not seem to "persist" between function calls: <?php $ctx = foo_create_context(); foo_assign_value($ctx, "foo", "bar"); // prints NULL: var_dump(foo_get_value($ctx, "foo")); ?> Please see my code below. In foo_get_value zend_hash_find() does *not* return FAILURE, so the key is there while the value is gone. Can someone spot my mistake? - Martin typedef struct _foo_context { HashTable *variables; } foo_context; PHP_FUNCTION(foo_create_context) { foo_context *ctx; ctx = emalloc(sizeof(foo_context)); ALLOC_HASHTABLE(ctx->variables); zend_hash_init(ctx->variables, 32, NULL, NULL, 0); ZEND_REGISTER_RESOURCE(return_value, ctx, le_foo_context); } PHP_FUNCTION(foo_assign_value) { foo_context *ctx; zval *zcontext; char *name; int name_len; zval *value; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rsz", &zcontext, &name, &name_len, &value) == FAILURE) { return; } ZEND_FETCH_RESOURCE(ctx, foo_context*, &zcontext, -1, FOO_CONTEXT_RES_NAME, le_adl_context); zend_hash_update(ctx->variables, name, name_len + 1, &value, sizeof(zval*), NULL); } PHP_FUNCTION(foo_get_value) { foo_context *ctx; zval *zcontext; char *name; int name_len; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rs", &zcontext, &name, &name_len) == FAILURE) { return; } ZEND_FETCH_RESOURCE(ctx, foo_context*, &zcontext, -1, FOO_CONTEXT_RES_NAME, le_foo_context); zval **value; if (zend_hash_find(ctx->variables, name, name_len + 1, (void**)&value) == FAILURE) { return; } RETVAL_ZVAL(*value, 1, 0); }