Why can't PHP open it after saving remote pictures? How to solve it?

Common reasons and solutions for PHP failure to save remote pictures

When saving remote pictures using PHP, you often encounter the problem of successful download but the image cannot be opened. This article will use code examples to analyze the root cause of the problem and provide effective solutions.

Problem description:

The following code tries to save the remote image, but the saved file cannot display normally:

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

Cause of the problem:

The problem with the above code is that file_put_contents('aaa.jpg', $url) directly writes the image URL string to the file, rather than the binary data of the image. Therefore, opening aaa.jpg is actually opening a text file containing the URL address.

Solution:

The correct way is to first use file_get_contents() function to obtain the binary data of the remote picture, and then use file_put_contents() function to save it to the local file.

 <?php $url = &#39;https://img.alicdn.com/i3/85764793/O1CN0128vX5s1lHFA4aj2YM_!!85764793.jpg&#39;;
$imageData = file_get_contents($url);
if ($imageData !== false) {
    file_put_contents(&#39;aaa.jpg&#39;, $imageData);
    echo "The picture was saved successfully!";
} else {
    echo "Image saving failed!";
}
?>

This code first uses file_get_contents($url) to get the data of the remote image. If the acquisition is successful ( $imageData !== false ), the data is written to the local file aaa.jpg . Added error handling, if the image data is failed, an error message will be output. This ensures that the binary data of the image is saved, not the URL string, thereby solving the problem that the image cannot be opened.

Through the above methods, you can effectively avoid the problem of PHP's failure to save remote pictures and ensure that the pictures can be displayed normally.

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