Operator-overload in PHP

php-operator-overload.diff

diff --git a/Zend/zend_operators.c b/Zend/zend_operators.c
index 93dca94..1e8358c 100644
--- a/Zend/zend_operators.c
+++ b/Zend/zend_operators.c
@@ -23,6 +23,7 @@
 
 #include "zend.h"
 #include "zend_operators.h"
+#include "zend_interfaces.h"
 #include "zend_variables.h"
 #include "zend_globals.h"
 #include "zend_list.h"
@@ -794,6 +795,13 @@ ZEND_API int add_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ *
 	zval op1_copy, op2_copy;
 	int converted = 0;
 
+    if (Z_TYPE_P(op1) == IS_OBJECT && zend_hash_exists(&Z_OBJCE_P(op1)->function_table, "__add", strlen("__add") + 1)) {
+        zval* tmp;
+        zend_call_method_with_1_params(&op1, NULL, NULL, "__add", &tmp, op2);
+        ZVAL_ZVAL(result, tmp, 0, 1);
+        return SUCCESS;
+    }
+
 	while (1) {
 		switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
 			case TYPE_PAIR(IS_LONG, IS_LONG): {
@@ -856,6 +864,13 @@ ZEND_API int sub_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ *
 	zval op1_copy, op2_copy;
 	int converted = 0;
 
+    if (Z_TYPE_P(op1) == IS_OBJECT && zend_hash_exists(&Z_OBJCE_P(op1)->function_table, "__sub", strlen("__sub") + 1)) {
+        zval* tmp;
+        zend_call_method_with_1_params(&op1, NULL, NULL, "__sub", &tmp, op2);
+        ZVAL_ZVAL(result, tmp, 0, 1);
+        return SUCCESS;
+    }
+
 	while (1) {
 		switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
 			case TYPE_PAIR(IS_LONG, IS_LONG): {
@@ -903,6 +918,13 @@ ZEND_API int mul_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ *
 	zval op1_copy, op2_copy;
 	int converted = 0;
 
+    if (Z_TYPE_P(op1) == IS_OBJECT && zend_hash_exists(&Z_OBJCE_P(op1)->function_table, "__mul", strlen("__mul") + 1)) {
+        zval* tmp;
+        zend_call_method_with_1_params(&op1, NULL, NULL, "__mul", &tmp, op2);
+        ZVAL_ZVAL(result, tmp, 0, 1);
+        return SUCCESS;
+    }
+
 	while (1) {
 		switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
 			case TYPE_PAIR(IS_LONG, IS_LONG): {
@@ -944,6 +966,13 @@ ZEND_API int div_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ *
 	zval op1_copy, op2_copy;
 	int converted = 0;
 
+    if (Z_TYPE_P(op1) == IS_OBJECT && zend_hash_exists(&Z_OBJCE_P(op1)->function_table, "__div", strlen("__div") + 1)) {
+        zval* tmp;
+        zend_call_method_with_1_params(&op1, NULL, NULL, "__div", &tmp, op2);
+        ZVAL_ZVAL(result, tmp, 0, 1);
+        return SUCCESS;
+    }
+
 	while (1) {
 		switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
 			case TYPE_PAIR(IS_LONG, IS_LONG):