Safely upload images with PHP

How to upload images safely in PHP? This article mainly introduces the method of uploading pictures safely in PHP, which can detect the picture type and realize the function of safely judging pictures. I hope to be helpful.

The example in this article describes how to safely upload images in PHP. Share it with everyone for your reference. The specific analysis is as follows:

This code is used to upload pictures. It can detect whether the picture is safe according to the picture type. It is not a simple detection of the extension

 
 Select a JPG, GIF, PNG or TIF File:  
 _END; if ($_FILES) { $name = $_FILES['filename']['name']; switch($_FILES['filename']['type']) { case 'image/jpeg': $ext = 'jpg'; break; case 'image/gif': $ext = 'gif'; break; case 'image/png': $ext = 'png'; break; case 'image/tiff': $ext = 'tif'; break; default: $ext = ''; break; } if ($ext) { $n = "image.$ext"; move_uploaded_file($_FILES['filename']['tmp_name'], $n); echo "Uploaded image '$name' as '$n':
"; echo ""; } else echo "'$name' is not an accepted image file"; } else echo "No image has been uploaded"; echo ""; ?>

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