diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c
index edadf024df24b..f3dfe0f9df57a 100644
--- a/Zend/zend_alloc.c
+++ b/Zend/zend_alloc.c
@@ -379,24 +379,6 @@ static const uint32_t bin_pages[] = {
 	ZEND_MM_BINS_INFO(_BIN_DATA_PAGES, x, y)
 };
 
-#if ZEND_DEBUG
-ZEND_COLD void zend_debug_alloc_output(char *format, ...)
-{
-	char output_buf[256];
-	va_list args;
-
-	va_start(args, format);
-	vsprintf(output_buf, format, args);
-	va_end(args);
-
-#ifdef ZEND_WIN32
-	OutputDebugString(output_buf);
-#else
-	fprintf(stderr, "%s", output_buf);
-#endif
-}
-#endif
-
 static ZEND_COLD ZEND_NORETURN void zend_mm_panic(const char *message)
 {
 	fprintf(stderr, "%s\n", message);
diff --git a/ext/pdo_firebird/firebird_statement.c b/ext/pdo_firebird/firebird_statement.c
index 60a5e60e11bde..96b5cb1da1240 100644
--- a/ext/pdo_firebird/firebird_statement.c
+++ b/ext/pdo_firebird/firebird_statement.c
@@ -87,7 +87,6 @@ static int get_formatted_time_tz(pdo_stmt_t *stmt, const ISC_TIME_TZ* timeTz, zv
 	struct tm t;
 	ISC_TIME time;
 	char timeBuf[80] = {0};
-	char timeTzBuf[124] = {0};
 	if (fb_decode_time_tz(S->H->isc_status, timeTz, &hours, &minutes, &seconds, &fractions, sizeof(timeZoneBuffer), timeZoneBuffer)) {
 		return 1;
 	}
@@ -100,8 +99,8 @@ static int get_formatted_time_tz(pdo_stmt_t *stmt, const ISC_TIME_TZ* timeTz, zv
 		return 1;
 	}
 
-	size_t time_tz_len = sprintf(timeTzBuf, "%s %s", timeBuf, timeZoneBuffer);
-	ZVAL_STRINGL(result, timeTzBuf, time_tz_len);
+	zend_string *time_tz_str = zend_strpprintf(0, "%s %s", timeBuf, timeZoneBuffer);
+	ZVAL_NEW_STR(result, time_tz_str);
 	return 0;
 }
 
@@ -115,7 +114,6 @@ static int get_formatted_timestamp_tz(pdo_stmt_t *stmt, const ISC_TIMESTAMP_TZ*
 	struct tm t;
 	ISC_TIMESTAMP ts;
 	char timestampBuf[80] = {0};
-	char timestampTzBuf[124] = {0};
 	if (fb_decode_timestamp_tz(S->H->isc_status, timestampTz, &year, &month, &day, &hours, &minutes, &seconds, &fractions, sizeof(timeZoneBuffer), timeZoneBuffer)) {
 		return 1;
 	}
@@ -130,8 +128,8 @@ static int get_formatted_timestamp_tz(pdo_stmt_t *stmt, const ISC_TIMESTAMP_TZ*
 		return 1;
 	}
 
-	size_t timestamp_tz_len = sprintf(timestampTzBuf, "%s %s", timestampBuf, timeZoneBuffer);
-	ZVAL_STRINGL(result, timestampTzBuf, timestamp_tz_len);
+	zend_string *timestamp_tz_str = zend_strpprintf(0, "%s %s", timestampBuf, timeZoneBuffer);
+	ZVAL_NEW_STR(result, timestamp_tz_str);
 	return 0;
 }