How to get the width and height of the image after PHP saves the remote image to the local?

How to get the width and height of the image after PHP saves the remote image to the local?

Overview:
When developing web applications, we often need to obtain images from remote servers and save them to the local server. After saving the images locally, we may further need to obtain the width and height of these images in order to display and layout these images correctly on the page. This article will introduce how to use PHP to save remote images to local and obtain the width and height of the image.

Code example:

<?php
// 保存远程图片到本地
function saveRemoteImage($remoteImageUrl, $localImagePath) {
    $remoteImageContent = file_get_contents($remoteImageUrl);
    file_put_contents($localImagePath, $remoteImageContent);
}

// 获取图片的宽度和高度
function getImageSize($localImagePath) {
    $imageSize = getimagesize($localImagePath);
    $width = $imageSize[0];
    $height = $imageSize[1];
    
    return ['width' => $width, 'height' => $height];
}

// 远程图片URL和本地保存路径
$remoteImageUrl = 'https://example.com/image.jpg';
$localImagePath = './images/image.jpg';

// 保存远程图片到本地
saveRemoteImage($remoteImageUrl, $localImagePath);

// 获取图片的宽度和高度
$imageSize = getImageSize($localImagePath);

// 输出图片的宽度和高度
echo '图片宽度：' . $imageSize['width'] . '<br>';
echo '图片高度：' . $imageSize['height'] . '<br>';
?>

Analysis:
The above code provides two functions to save remote images and obtain the width and height of images.

First, the saveRemoteImage function accepts two parameters: the remote image URL and the local save path. This function uses the file_get_contents function to get the contents of the remote image and the file_put_contents function to save the content to the local path. In this way, the function of saving remote pictures to the local server can be realized.

Secondly, the getImageSize function accepts the local image path as a parameter, and uses the getimagesize function to obtain the width and height information of the image. getimagesizeThe function returns an array containing the width, height and other related image information of the image. In our example, we only care about width and height, so we get those two values ​​by array indexing.

Finally, we call the saveRemoteImage function to save the remote image locally, and use the getImageSize function to obtain the width and height of the saved image. Finally, we output these two values ​​so they can be displayed on the page.

Summary:
Through the above example code, we can easily use PHP to save remote images to the local and obtain the width and height of the saved images. This is very useful for processing images when developing web applications.

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