<form action = "kadai_1.php" method = "POST" >
<input type="text" name="comment">
<input type="submit" value="送信">
</form>

<?php
echo "あああ";

$file_handle = fopen( "test.txt", "w");
fwrite( $file_handle, "テスト２");
fclose($file_handle);
if (isset($_POST["comment"])) {
    echo $_POST["comment"];
}
?>

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