Help with image upload ?

[cyber_alchemist]

I was writing a code which check whether the file upload was successful or not or the file/image is of supported type or not. The script though always returns a error of 'invalid file type' even if i upload the correct file type. what could be the the plausible causes for it ?? do i have a error in my code or something else ?? here is the code.

if ( isset( $_POST[ 'submit' ] ) ) {
                        $dir_1   = './images/';
                        $thumb_1 = '.images/thumb';
                        //making sure the uploaded file transfer was successful
                        if ( $_FILES[ 'pic1' ][ 'error' ] != UPLOAD_ERR_OK ) {
                                switch ( $_FILES[ 'pic1' ][ 'error' ] ) {
                                        case UPLOAD_ERR_INI_SIZE:
                                                die( 'The uploaded 1st image exceeds the upload_max_filesize directive ' . 'in php.ini.' );
                                                break;
                                        case UPLOAD_ERR_FORM_SIZE:
                                                die( 'The uploaded 1st exceeds the MAX_FILE_SIZE directive that ' . 'was specified in the HTML form.' );
                                                break;
                                        case UPLOAD_ERR_PARTIAL:
                                                die( 'The uploaded 1st image was only partially uploaded.' );
                                                break;
                                        case UPLOAD_ERR_NO_FILE:
                                                die( 'No 1st image was uploaded.' );
                                                break;
                                        case UPLOAD_ERR_NO_TMP_DIR:
                                                die( 'The server is missing a temporary folder.' );
                                                break;
                                        case UPLOAD_ERR_CANT_WRITE:
                                                die( 'The server failed to write the uploaded the uploaded 1st image to disk.' );
                                                break;
                                        case UPLOAD_ERR_EXTENSION:
                                                die( '1st image upload stopped by extension.' );
                                                break;
                                } //$_FILES[ 'pic1' ][ 'error' ]
                        } //$_FILES[ 'pic1' ][ 'error' ] != UPLOAD_ERR_OK
                        // making sure the file is being uploaded

                        $error = 'The 1st image you have uploaded either was not of supported filetype.';
                        switch ( $type ) {
                                case IMAGETYPE_GIF:
                                        $image_1 = imagecreatefromgif( $_FILES[ 'pic1' ][ 'tmp_name' ] ) or die( $error );
                                        break;
                                case IMAGETYPE_JPEG:
                                        $image_1 = imagecreatefromjpeg( $_FILES[ 'pic1' ][ 'tmp_name' ] ) or die( $error );
                                        break;
                                case IMAGETYPE_PNG:
                                        $image_1 = imagecreatefrompng( $_FILES[ 'pic1' ][ 'tmp_name' ] ) or die( $error );
                                        break;
                                default:
                                        die( $error );                                        
                        } //$type
                          $image_date_1 = @date( 'Y-m-d' );
                         list( $width, $height, $type, $attr ) = getimagesize( $_FILES[ 'pic1' ][ 'tmp_name' ] );

}

[Ch0cu3r]

Where is the variable $type defined?

[cyber_alchemist]

oh my bad