image src is not displaying the page in php - image

Question

**I'm trying to upload the img path in database and show them in the slider, but the problem is the img src is not showing the page assigned. Can any body tell me why the image src is not loading the page.
my code is below slider.php slider has this image code :<img src='<?php echo "imagetest.php?id=$id" ?> width="200"> the image path couldn't display the page imagetest.php has following code: this page is not showing up in img src of the slider if (empty($_GET['id']) || !is_numeric($_GET['id'])) {
echo 'A valid image file id is required to display the image file.';
exit;
}
$imageId = $_GET['id'];
//connect to mysql database
if ($conn = mysqli_connect('localhost', 'root', 'root', 'test')) {
$content = mysqli_real_escape_string($conn, $content);
$sql = "SELECT type, content FROM images where id = {$imageId}";
if ($rs = mysqli_query($conn, $sql)) {
$imageData = mysqli_fetch_array($rs, MYSQLI_ASSOC);
mysqli_free_result($rs);
} else {
echo "Error: Could not get data from mysql database. Please try again.";
}
//close mysqli connection
mysqli_close($conn);
} else {
echo "Error: Could not connect to mysql database. Please try again.";
}
if (!empty($imageData)) {
// show the image.
header("Content-type: {$imageData['type']}");
echo $imageData['content'];
}
?>

Answer 1

Use file_get_contents
<img src="<?php echo file_get_contents('imagetest.php?id='. $id);?>" width="200"/>
and remove header(), u don't need it.

Answer 2

In php file
function track(){
header('Content-Type: image/gif');
$image = 'image.gif';
echo file_get_contents($image);
}
In view file
<img src="track.php" width="200"/>
Hope it's help ^^