Allow exceptions in __toString()

RFC: https://wiki.php.net/rfc/tostring_exceptions

And convert some object to string conversion related recoverable
fatal errors into Error exceptions.

Improve exception safety of internal code performing string
conversions.

1 files changed, 4 insertions, 1 deletions

diff --git a/ext/standard/formatted_print.c b/ext/standard/formatted_print.c
index b804cda500..4ee68adefa 100644
--- a/ext/standard/formatted_print.c
+++ b/ext/standard/formatted_print.c
@@ -400,7 +400,10 @@ php_formatted_print(zval *z_format, zval *args, int argc)
 	int always_sign;
 	size_t format_len;
 
-	convert_to_string_ex(z_format);
+	if (!try_convert_to_string(z_format)) {
+		return NULL;
+	}
+
 	format = Z_STRVAL_P(z_format);
 	format_len = Z_STRLEN_P(z_format);
 	result = zend_string_alloc(size, 0);