PHP: How would you check if the result string of file_get_contents() is a JPG image?

I am using file_get_contents() to pull some images from a remote server and I want to confirm if the result string is a JPG/PNG image before further processing, like saving it locally and create thumbs.

$string = file_get_contents($url);

How would you do this?

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PHP: How would you check if the result string of file_get_contents() is a JPG image?

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