Code Examples -> How to show images stored in a database

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PHP Code Examples

Title :	How to show images stored in a database
Categories :	PHP, MySQL, Databases	bastien koert
Date :	Jan 26th 2005
Grade :	4 of 5 (graded 7 times)
Viewed :	26437
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by bastien koert
Action :	Grade This Code Example
Tools :	My Examples List

Code

There have been a number of questions lately about storing images in a db table and then how to show them correctly. The problem is that the header for images needs to be set correctly for the binary data to be show correctly.

Here are the two working pages (tested my machine (xp, apache2, php4.3.9 mysql 4.01.x)

In the areas for the db query you will see the notation

$result = connect(sql);

connect is a custom function to handle all db interatction that is separate from the pages and included in the conn.php file. There is another example with that function in my previously posted code samples.

show_desc.php

<?php
require("conn.php");

// you may have to modify login information for your database server

$query = "select description, id from binary_data ";
$result = connect($query);

while ($rows = MYSQL_FETCH_ARRAY($result)) {
echo $rows['description'];
echo "<br><br>";
echo "<img src=\"show_image.php?id=".$rows['id']."\">\n";
}
?>

show_image.php

<?php

require("conn.php");
//check to see if the id is passed
if(isset($_GET['id'])) {
$id=$_GET['id'];

$query = "select bin_data, filetype from binary_data where id=$id";
//echo $query;
$result = connect($query);
$row = mysql_fetch_array($result);
{
$data = $row['bin_data'];
$type = $row['filetype'];
}
if ($type=="pjpeg") $type = "jpeg";
Header( "Content-type: $type");
echo $data;
}
?>

Database table:

CREATE TABLE binary_data (
id INT(4) NOT NULL AUTO_INCREMENT PRIMARY KEY,
description CHAR(50),
bin_data LONGBLOB,
filename CHAR(50),
filesize CHAR(50),
filetype CHAR(50)
);

As always, these are simple samples only. There are many additions one could make to make this more robust and secure, from adding extension and mime type limitations to more db security.

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User Comments

	matthew waygood wrote : 1265 You could also check if the entry exists before outputting the header and content. And check the id is valid, or even force it to be valid with the following:- $id=ereg_replace("[^0-9]","",urldecode($_GET[`id`])); // remove all non number values from the id
	Boaz Yahav wrote :1633 What is the deal with : { $data = $row[`bin_data`]; $type = $row[`filetype`]; } in show_image.php