What considerations should be made when using PHP to display images from a folder?

When using PHP to display images from a folder, it is important to consider security measures to prevent unauthorized access to sensitive files. One way to achieve this is by storing the images outside of the web root directory and using PHP to fetch and display them. Additionally, it's important to validate user input to prevent directory traversal attacks. 

<?php
$folder = 'images/';
$files = scandir($folder);

foreach ($files as $file) {
    if (in_array($file, array(".", ".."))) {
        continue;
    }
    
    echo '<img src="' . $folder . $file . '" alt="' . $file . '">';
}
?>

Keywords

file system image processing directory listing security caching

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