What are some best practices for implementing a next and previous function in a PHP gallery script without MySQL?

When implementing a next and previous function in a PHP gallery script without MySQL, you can achieve this by storing the images in an array and using session variables to keep track of the current image index. By incrementing or decrementing the index when navigating to the next or previous image, you can display the appropriate image in the gallery. 

<?php
session_start();

// Array of image paths
$images = ['image1.jpg', 'image2.jpg', 'image3.jpg', 'image4.jpg'];

// Check if current image index is set in session, if not set it to 0
if (!isset($_SESSION['current_image_index'])) {
    $_SESSION['current_image_index'] = 0;
}

// Function to display the current image
function displayImage() {
    global $images;
    echo '<img src="' . $images[$_SESSION['current_image_index']] . '" />';
}

// Function to navigate to the next image
function nextImage() {
    global $images;
    if ($_SESSION['current_image_index'] < count($images) - 1) {
        $_SESSION['current_image_index']++;
    }
}

// Function to navigate to the previous image
function prevImage() {
    if ($_SESSION['current_image_index'] > 0) {
        $_SESSION['current_image_index']--;
    }
}

// Display the current image
displayImage();
?>

Keywords

PHP gallery script next function previous function without MySQL

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