zend_make_printable_zval choses cast_object over __toString

https://bugs.php.net/bug.php?id=62328

Added a check to see if the object implements a __toString magic
method. This should be called instead of the cast_object method of
built-in classes when defined.

Author: lt

Zend/zend.c

@@ -258,6 +258,12 @@ ZEND_API void zend_make_printable_zval(zval *expr, zval *expr_copy, int *use_cop
 			{
 				TSRMLS_FETCH();
 
+				if (Z_OBJCE_P(expr)->__tostring) {
+					if (zend_std_cast_object_tostring(expr, expr_copy, IS_STRING TSRMLS_CC) == SUCCESS) {
+						break;
+					}
+				}
+
 				if (Z_OBJ_HANDLER_P(expr, cast_object)) {
 					zval *val;