imagejpeg geeft alleen tekens, geen image als output!

<?php
// Content type
header('Content-type: image/jpeg');

// The file
$filename = "http://images.domein.nl/images/".$foto."";

// Set a maximum height and width
$width = 80;
$height = 80;

// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);

$ratio_orig = $width_orig/$height_orig;

if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
} else {
   $height = $width/$ratio_orig;
}

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// Output
imagejpeg($image_p, null, 100);
?>

<?php
// Content type
header('Content-type: image/jpeg');
 
// The file
$filename = "http://images.domein.nl/images/".$foto."";
 
// Set a maximum height and width
$width = 80;
$height = 80;
 
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
 
$ratio_orig = $width_orig/$height_orig;
 
if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
} else {
   $height = $width/$ratio_orig;
}
 
// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
 
// Output
imagejpeg($image_p, null, 100);
?>

header('Content-Type: image/jpeg');

header('Content-Type: image/jpeg');

<?php
// Output
imagejpeg($image_p, null, 100);

<?php
// Output
imagejpeg($image_p, null, 100);