Special characters displayed after imagecopyresampled - php

Question

i made a script to upload avatars on my website, it works as intended (the image is resized and uploaded) but I don't understand why thoses special characters are displayed after the page is reloaded.
Script :
//Session for test purpose
session_start();
$_SESSION['user']['id'] = 1337;
/*************************
AVATAR UPLOAD
**************************/
$msg='';
if(isset($_POST['upload'])){
$avatar = $_FILES['avatar']['name'];
$avatar_tmp = $_FILES['avatar']['tmp_name'];
if(!empty($avatar_tmp)){
//Extension test
$image = explode('.', $avatar);
$image_ext = end($image);
if(!in_array(strtolower($image_ext), array('png', 'gif', 'jpeg','jpg'))){
$msg .= '<div class="error">Choosen file is not an image</div>';
}
//Mime test and image create
else{
$image_size = getimagesize($avatar_tmp);
if($image_size['mime'] == 'image/jpeg'){
$image_src = imagecreatefromjpeg($avatar_tmp);
}
elseif($image_size['mime'] == 'image/png'){
$image_src = imagecreatefrompng($avatar_tmp);
}
elseif($image_size['mime'] == 'image/gif'){
$image_src = imagecreatefromgif($avatar_tmp);
}
else{
$msg .= '<div class="error">Choosen file is not an image</div>';
}
}
//No error -> resize and upload
if(empty($msg)){
$image_width = 150;
if($image_size[0] <= $image_width){
$image_finale = $image_src;
}
else{
$new_width[0] = $image_width;
$new_height[1] = ($image_size[1] / $image_size[0]) * $image_width;
$image_finale = imagecreatetruecolor($new_width[0], $new_height[1]);
imagecopyresampled($image_finale, $image_src, 0, 0, 0, 0, $new_width[0], $new_height[1], $image_size[0], $image_size[1]);
}
imagejpeg($image_finale, 'img/' . $_SESSION['user']['id'] . '.jpg');
imagejpeg($image_finale);
$msg .= '<div class="success">Avatar uploaded</div>';
}
}
}
Displayed characters :
ÿØÿàJFIFÿþ>CREATOR: gd-jpeg v1.0 (using IJG JPEG v90), default quality ÿÛC $.' ",#(7),01444'9=82<.342ÿÛC ...
Thanks in advance for your help.

Answer 1

You call
imagejpeg($image_finale);
second time at the end, I am sure you mean
imagedestroy($image_finale);
It is because imagejpeg without second parameter (path) outputs it to the browser, which gives garbage without header before that.