Why Does My MySQL BLOB Image Display Incorrectly When Other Output Is Present?

Handling Image Display and Additional Output from a MySQL BLOB Column

In the code sample provided below, an image stored as a BLOB variable in a MySQL database is being displayed. However, it is encountered that if any additional text is output before or after the image, it results in erroneous display.

<?php

include("inc/library.php");

connectToDatabase();

$sql = "SELECT * FROM theBlogs WHERE ID = 1;";

$result = mysql_query($sql) or die(mysql_error());  
$row = mysql_fetch_array($result);

header("Content-type: image/jpeg");
echo $row['imageContent'];
$db->close();

?>

To address this issue, we need to understand that the image data is being treated as a binary stream. Outputting text before or after the image disrupts the binary data and causes display problems.

The solution is to convert the image data into base64 format and embed it within an HTML image tag. This approach allows us to separate the image data from other output.

echo '<img src="data:image/jpeg;base64,' . base64_encode( $row['imageContent'] ) . '" />';
echo 'Hello world.';

While this method works, it is not optimal for performance and caching. For more efficient handling of image data, consider using an appropriate image hosting service or database caching mechanisms.

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