Explicitly declare the char as signed in zend_ffi_val.

This causes issues down the line as char are unsigned on some platforms,
e.g. ARM and cause a [-Wtype-limits] warning to be emitted.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/ffi/php_ffi.h b/ext/ffi/php_ffi.h
index 913d63ecd0..1b51a832c9 100644
--- a/ext/ffi/php_ffi.h
+++ b/ext/ffi/php_ffi.h
@@ -200,7 +200,7 @@ typedef struct _zend_ffi_val {
 		uint64_t        u64;
 		int64_t         i64;
 		zend_ffi_double d;
-		char            ch;
+		signed char     ch;
 		struct {
 			const char *str;
 			size_t      len;