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分享我以二进制形式读取图片文件，为什么输出结果为乱码啊？
html：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form name="form" method="post" action="index.php" enctype="multipart/form-data" >
<input name="cover" type="file" id="cover" size="10">
<input type="submit" name="Submit" value="提交">
</form>
</body>
</html>
index.php:
<?php
$cover=$_POST['cover'];
if($_POST['Submit']==true){
$cover_type=strstr($cover, '.');
$arr=array('.jpg','.gif','.JPG','.GIF','.bmp','.BMP');
if(!in_array($cover_type, $arr)){
echo "<script>alert('no');</script>";
}else{
$cover=iconv("utf-8","gb2312",$cover);//字符串设置为utf-8
$fp=fopen($cover,"rb");//以二进制形式打开图片
$image=addslashes((fread($fp,filesize($cover))));
var_dump($image);//这里结果输出为乱码，而不是二进制数
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form name="form" method="post" action="index.php" enctype="multipart/form-data" >
<input name="cover" type="file" id="cover" size="10">
<input type="submit" name="Submit" value="提交">
</form>
</body>
</html>
index.php:
<?php
$cover=$_POST['cover'];
if($_POST['Submit']==true){
$cover_type=strstr($cover, '.');
$arr=array('.jpg','.gif','.JPG','.GIF','.bmp','.BMP');
if(!in_array($cover_type, $arr)){
echo "<script>alert('no');</script>";
}else{
$cover=iconv("utf-8","gb2312",$cover);//字符串设置为utf-8
$fp=fopen($cover,"rb");//以二进制形式打开图片
$image=addslashes((fread($fp,filesize($cover))));
var_dump($image);//这里结果输出为乱码，而不是二进制数
}
}
?>
...全文
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