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-rw-r--r--ext/json/json_encoder.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/json_encoder.c b/ext/json/json_encoder.c
index 3ec12b8968..f28bfbd4e4 100644
--- a/ext/json/json_encoder.c
+++ b/ext/json/json_encoder.c
@@ -350,7 +350,7 @@ static int php_json_escape_string(
0xffffffff, 0x500080c4, 0x10000000, 0x00000000};
pos++;
- if (EXPECTED(!((charmap[us >> 5] >> (us & 0x1f)) & 1))) {
+ if (EXPECTED(!ZEND_BIT_TEST(charmap, us))) {
smart_str_appendc(buf, (unsigned char) us);
} else {
switch (us) {