Index: Zend/zend.c
===================================================================
--- Zend/zend.c	(revision 290872)
+++ Zend/zend.c	(working copy)
@@ -1010,7 +1010,8 @@
 	if (!error_filename) {
 		error_filename = "Unknown";
 	}
-
+
+	EG(error_handled_by_user) = 0;
 	va_start(args, format);

 	/* if we don't have a user defined error handler */
@@ -1104,6 +1105,20 @@
 						zend_error_cb(type, error_filename, error_lineno, format, args);
 					}
 					zval_ptr_dtor(&retval);
+
+					/* allows monitoring type extensions to intercept calls even if
+						user has defined an error handler. */
+					if (EG(always_invoke_error_cb)) {
+						va_list orig_cb_copy;
+
+						va_copy(orig_cb_copy, args);
+						EG(error_handled_by_user) = 1;
+						zend_error_cb(type, error_filename, error_lineno, format, orig_cb_copy);
+#ifdef va_copy
+						va_end(orig_cb_copy);
+#endif
+						EG(error_handled_by_user) = 0;
+					}
 				}
 			} else if (!EG(exception)) {
 				/* The user error handler failed, use built-in error handler */
Index: Zend/zend_globals.h
===================================================================
--- Zend/zend_globals.h	(revision 290872)
+++ Zend/zend_globals.h	(working copy)
@@ -257,6 +257,9 @@
 	void *saved_fpu_cw;

 	void *reserved[ZEND_MAX_RESERVED_RESOURCES];
+
+	zend_bool always_invoke_error_cb;
+	zend_bool error_handled_by_user;
 };

 struct _zend_ini_scanner_globals {
Index: Zend/zend_execute_API.c
===================================================================
--- Zend/zend_execute_API.c	(revision 290872)
+++ Zend/zend_execute_API.c	(working copy)
@@ -150,6 +150,8 @@
 	EG(in_autoload) = NULL;
 	EG(autoload_func) = NULL;
 	EG(error_handling) = EH_NORMAL;
+	EG(always_invoke_error_cb) = 0;
+	EG(error_handled_by_user) = 0;

 	zend_vm_stack_init(TSRMLS_C);
 	zend_vm_stack_push((void *) NULL TSRMLS_CC);