From a2170c81f194885f244d31c39f791b61e93b49d4 Mon Sep 17 00:00:00 2001
From: zigzagdev <msts.oo0131@gmail.com>
Date: Thu, 28 May 2026 20:39:19 +0900
Subject: [PATCH] fix: Use STREAM_FILTER_WRITE instead of STREAM_FILTER_READ in
 prependStreamFilterOnWrite

---
 src/AbstractCsv.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AbstractCsv.php b/src/AbstractCsv.php
index 7209fed2..eef20803 100644
--- a/src/AbstractCsv.php
+++ b/src/AbstractCsv.php
@@ -468,7 +468,7 @@ public function prependStreamFilterOnWrite(string $filtername, mixed $params = n
     {
         $this->document instanceof Stream || throw UnavailableFeature::dueToUnsupportedStreamFilterApi(get_class($this->document));
 
-        $this->document->prependFilter($filtername, STREAM_FILTER_READ, $params);
+        $this->document->prependFilter($filtername, STREAM_FILTER_WRITE, $params);
         $this->stream_filters[$filtername] = true;
         $this->resetProperties();
         $this->input_bom = null;