PHP traditional file upload and Base64-bit file upload

1. Basic knowledge

By using PHP’s global array $_FILES, you can upload files from the client computer to a remote server.

The first parameter is the input name of the form, and the second subscript can be "name", "type", "size", "tmp_name" or "error". Like this:

$_FILES["file"]["name"] - the name of the uploaded file

$_FILES["file"]["type"] - the type of file being uploaded

$_FILES["file"]["size"] - The size of the uploaded file, in bytes

$_FILES["file"]["tmp_name"] - The name of the temporary copy of the file stored on the server

$_FILES["file"]["error"] - error code caused by file upload

This is a very simple way to upload files. For security reasons, you should add restrictions on who has permission to upload files.

2. Commonly used uploads

if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"] ["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"][" size"] < 20000))
 {
 if ($_FILES["file"]["error"] > 0)
 {
 echo "Return Code: " . $_FILES["file"]["error" ] . "";
 }
 else
 {
 echo "Upload: " . $_FILES["file"]["name"] . "";
 echo "Type : " . $_FILES["file"]["type"] . "";
 echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb";
 echo "Temp file: " . $_FILES["file"]["tmp_name"] . "";

 if (file_exists("upload/" . $ _FILES["file"]["name"]))
 {
 echo $_FILES["file"]["name"] . " already exists. ";
 }
 else
 {
 move_uploaded_file($_FILES["file "]["tmp_name"],
 "upload/" . $_FILES["file"]["name"]);
 echo "Stored in: " . "upload/" . $_FILES["file"][" name"];
 }
 }
 }
else
 {
 echo "Invalid file";
 }
?>




 Filename:

3. PHP reads and saves base64 encoded image content

if($_POST['submit']){
 $image_info = getimagesize($_FILES['file']['tmp_name ']);//$_FILES['file']['tmp_name'] is the file path
 $base64_image_content = "data:{$image_info['mime']};base64," . chunk_split(base64_encode(file_get_contents($_FILES ['file']['tmp_name'])));
 echo $base64_image_content;die;
 if (preg_match('/^(data:s*image/(w+);base64,)/', $base64_image_content, $ result)){
 $type = $result[2];
 $new_file = "./test.{$type}";
 if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
 echo 'New file saved successfully:', $new_file;
 }
 }
}
?>



 Filename:

File upload, PHP