PHP implements photo wall function

With the development of social networks, photo walls have become a very popular feature. The photo wall allows users to upload and browse photos in the form of waterfall flow on the page, which is very suitable for official websites, personal albums, blogs and other scenarios that display a large number of pictures. Today, we will use PHP to implement a photo wall function.

1. Determine technology selection

Before implementing the photo wall function, we need to do some preparatory work. First, we need to determine what technology to use to implement the photo wall. There are two common ones:

• Use jQuery plug-ins: such as Masonry, Isotope, etc., which can easily implement waterfall flow layout.
• Use PHP to write waterfall flow: use PHP loops and conditional statements to manually calculate the position of the picture.

In this article, we will use the second method, which is to use PHP handwritten waterfall flow, to implement the photo wall function.

2. Database design

Before implementing the photo wall function, we need to design a database to store photo information. We need to store the ID, file name, photo title, upload time and other information of each photo. The specific database structure is as follows:

CREATE TABLE photos (
id int(11) NOT NULL AUTO_INCREMENT,
file_name varchar(255) NOT NULL,
title varchar(255) NOT NULL,
created_at datetime NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3. Upload photos

Before implementing the photo wall function, we also need to implement a function to upload photos , so that users can upload photos and store them in the database. We can use PHP's file upload function to achieve this function. The specific steps are as follows:

• First, we need to add a file upload form to the page so that users can upload photos.
• After the user uploads the photo, we need to receive the photo in the background and store it in the specified folder on the server. Stored file names can be identified using timestamps.
• After storing it on the server, we need to insert the photo information into the database.

The following is a simple PHP code example for uploading photos.

$upload_dir = './uploads/';

if ($_FILES) {

$file = $_FILES['file'];
$file_name = time() . '-' . $file['name'];
$file_path = $upload_dir . $file_name;

if (move_uploaded_file($file['tmp_name'], $file_path)) {
    $title = $_POST['title'];
    $created_at = date('Y-m-d H:i:s');

    $connection = mysqli_connect('localhost', 'user', 'password', 'database');
    $query = "INSERT INTO photos (file_name, title, created_at) VALUES ('$file_name', '$title', '$created_at')";
    mysqli_query($connection, $query);
}

}
?>

4. Display photo wall

After the user uploads some photos, we need to display these photos in the photo wall. We use PHP on the front-end page to query the photo information in the database, and then dynamically add the photos to the page based on the calculated position. The specific process is as follows:

• Query the photo information in the database and arrange it in reverse order according to the upload time.
• Use a loop to traverse the queried photo information and calculate the location of each photo.
• Dynamicly add photos to the page based on the calculated position. You can use HTML and CSS to define the layout of your photos.

The following is a simple PHP code example for displaying a photo wall.

$connection = mysqli_connect('localhost', 'user', 'password', 'database');
$query = "SELECT * FROM photos ORDER BY created_at DESC ";
$result = mysqli_query($connection, $query);

$photos = array();

while ($row = mysqli_fetch_assoc($result)) {

$photos[] = $row;

}

?>

<?php foreach ($photos as $key => $photo): ?>
    <?php
    $width = rand(250, 500);
    $height = rand(250, 500);
    $left = $key % 2 == 0 ? 0 : 1;
    ?>

    <div class="item" style="width:<?= $width ?>px; height:<?= $height ?>px; left:<?= $left * 50 ?>%;">
        <img  src="./uploads/<?= $photo['file_name'] ? alt="PHP implements photo wall function" >" alt="<?= $photo['title'] ?>">
    </div>
<?php endforeach; ?>

5. Summary

The above is the entire process of using PHP to implement the photo wall function. When implementing the photo wall function, you need to pay attention to the following points:

• Determine the technology selection and select the appropriate technology to implement the photo wall function according to the actual situation.
• Design database to store picture information.
• Implement the function of uploading photos and store the uploaded photo information in the database.
• Display the photo wall and dynamically add pictures to the page according to the calculated position.

I hope this article can help you quickly implement the photo wall function. If you have any questions or suggestions, please leave them in the comment area.

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