PHP upload pictures Basic code sample

A, HTML code is as follows:

<form name="form2" method="post" action="?type=add" enctype="multipart/form-data">
<input type="file" name="file" id="cover" required/>
</form>

Two, PHP code is as follows:

IF (( $ _GET [ "of the type"] == "the Add") && $ _POST ) {
     // determine whether the uploaded file error, that is the case, an error is returned 
    IF ( $ _FILES [ "File"] [ "error" ]) 
    { 
        echo  $ _FILES [ "file"] [ "error" ];
         Exit ; 
    } 
    the else 
    { 
        // no error 
        // condition limitation 
        // file type is determined to upload or png and jpg size not exceeding 1024000B 
        IF (( $ _FILES [ "File"] [ "of the type"] == "Image / PNG" || $ _FILES [ "File"] [ "of the type"] == "Image / jpeg") &&$_FILES["file"]["size"]<1024000)
        {
            //Prevent duplicate file names 
            $ path = "/ Upload / Movie /." DATE ( 'Ym of-D') "/.". Time (). $ _FILES [ "File"] [ "name" ];
             $ filename = $ _SERVER [ 'DOCUMENT_ROOT']. $ path ; 
        
            // check the file or directory exists 
            iF ( the file_exists ( $ filename )) 
            { 
                echo "that the file already exists" ;
                 Exit ; 
            } 
            the else 
            { 
                // save the file, move file uploaded move_uploaded_file to a new position 
                IF (! @ Copy ( $ _FILES[ 'File'] [ 'tmp_name'], $ file_name )) {
                     IF ( move_uploaded_file ( $ _FILES [ 'File'] [ 'tmp_name'], $ filename )) {
                         echo "Upload successful" ; 
                    } the else {
                         echo "Upload failed " ;
                         Exit ; 
                    } 
                } 

            } 
        } 
        the else 
        { 
            echo " file type is wrong " ; 
        } 
    } 
}