PHP image operation: how to get the size and file size of images

PHP Image Operation: How to Get the Size and File Size of Images

Introduction
In developing websites or applications, we often need to process images. Obtaining the size and file size of images is a common requirement, which can be easily achieved through some functions in PHP. This article will introduce how to use PHP to obtain the size and file size of images, and attach a code example.

1. Get the image size
   To get the size of the image, you can use PHP's built-in function getimagesize(). This function will return an array containing image size information, including the image's width, height, MIME type, etc.

Sample code:

$imagePath = "path_to_your_image.jpg"; // 图片的路径

$imageInfo = getimagesize($imagePath); // 获取图片尺寸信息

if ($imageInfo) {
    $width = $imageInfo[0]; // 图片宽度
    $height = $imageInfo[1]; // 图片高度
    $mime = $imageInfo['mime']; // 图片MIME类型

    echo "图片宽度：{$width}px<br>";
    echo "图片高度：{$height}px<br>";
    echo "图片类型：{$mime}<br>";
} else {
    echo "无法获取图片尺寸信息";
}

In the sample code, first use the getimagesize() function to obtain the size information of the image, and then save the width, height and MIME type into variables. Finally, use the echo statement to output this information to the browser.

2. Get the image file size
   To get the file size of the image, you can use PHP's built-in function filesize(). This function will return the number of bytes of the file, which is the file size.

Sample code:

$imagePath = "path_to_your_image.jpg"; // 图片的路径

$fileSize = filesize($imagePath); // 获取文件大小

if ($fileSize !== false) {
    echo "文件大小：{$fileSize}字节";
} else {
    echo "无法获取文件大小";
}

In the sample code, use the filesize() function to get the file size of the image and save it to the $fileSize variable. Then use an echo statement to output the file size to the browser.

Summary
Through a simple code example, we learned how to use PHP to get the size and file size of an image. This information is useful for image processing and presentation. If you encounter similar needs during development, you can refer to the methods provided in this article and modify and apply them according to your actual situation.

Notes

1. Make sure the image path is correct. In the sample code, you need to replace "path_to_your_image.jpg" with your actual image path.
2. Make sure the server is configured correctly. Sometimes, the size and file size of the images obtained may be limited by the server configuration. If you are unable to obtain correct results, please check your server configuration.

Reference link

• PHP official documentation: https://www.php.net/manual/zh/function.getimagesize.php
• PHP Official documentation: https://www.php.net/manual/zh/function.filesize.php

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