某課題
急遽phpとかが必要になったので極私的メモ
#set filename
$filename = 'hogehoge.txt';#open file
$fp = fopen($filename, 'r');#create checksum of file
$md5 = md5(fread($fp, filesize($filename)));
#append base64 filter to 'file handle'
stream_filter_append($fp, 'convert.base64-encode');
#get base64 contents of file
$base64_of_file = fread($fp, filesize($filename));#close file handle
fclose($fp);