//Filetype: JPEG,PNG,GIF
$file = "encode.jpg" ;
if ( $fp = fopen ( $file , "rb" , 0 ) )
$gambar = fread ( $fp , filesize ( $file ) ) ;
fclose ( $fp ) ;
$base64 = chunk_split ( base64_encode ( $gambar ) ) ;
// 输出
$encode = '<img decoding="async" src="data:image/jpg/png/gif;base64,' . $base64 . '" >' ;
echo $encode ;