From 5185d46ccc2f3858d343c5cf4edc5bc4220c7cd1 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+ndossche@users.noreply.github.com>
Date: Tue, 11 Nov 2025 00:01:38 +0100
Subject: [PATCH] Fix zero-extension on range() char parameters

---
 ext/standard/array.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ext/standard/array.c b/ext/standard/array.c
index 6de17f2bff7..0389eb1840a 100644
--- a/ext/standard/array.c
+++ b/ext/standard/array.c
@@ -3049,9 +3049,9 @@ PHP_FUNCTION(range)
 			goto handle_numeric_inputs;
 		}
 
-		/* Generate array of characters, as ints to make bounds checking possible in the loop condition */
-		int low = Z_STRVAL_P(user_start)[0];
-		int high = Z_STRVAL_P(user_end)[0];
+		/* Generate array of characters, as zero-extended ints to make bounds checking possible in the loop condition */
+		int low = (unsigned char) Z_STRVAL_P(user_start)[0];
+		int high = (unsigned char) Z_STRVAL_P(user_end)[0];
 
 		/* Decreasing char range */
 		if (low > high) {