What is the reason why PHP saves remote pictures cannot be opened? How to solve this problem?

PHP's remote image saving problem and solution

In PHP development, saving remote images often encounters successful saving but cannot be opened. This article will analyze the cause of the problem through code examples and provide solutions.

Problem description:

The following PHP code intends to save remote images locally:

 $url = 'https://img.alicdn.com/i3/85764793/o1cn0128vx5s1lhfa4aj2ym_!!85764793.jpg';
file_put_contents('aaa.jpg', $url);

After running, although the aaa.jpg file was created successfully, it could not be opened normally, while the original link could access the picture normally.

Problem analysis:

The problem is that file_put_contents() function directly writes the URL string to the file, not the image data itself. Therefore, the file content is URL text rather than image binary data.

Solution:

The correct way is to use file_get_contents() to get the binary data of the picture first, and then write it to the file. The modified code is as follows:

 <?php $url = &#39;https://img.alicdn.com/i3/85764793/O1CN0128vX5s1lHFA4aj2YM_!!85764793.jpg&#39;;
$imageData = file_get_contents($url);
file_put_contents(&#39;aaa.jpg&#39;, $imageData);
?>

This code first uses file_get_contents($url) to obtain image data, and then uses file_put_contents('aaa.jpg', $imageData) to write data to the file. In this way, the aaa.jpg file will contain the correct image binary data, so it can be opened normally. It should be noted that there may be access restrictions or images that do not exist, and corresponding error handling is required.

The above is the detailed content of What is the reason why PHP saves remote pictures cannot be opened? How to solve this problem?. For more information, please follow other related articles on the PHP Chinese website!