hash_update_stream

Pump data into an active hashing context from an open stream ()
int hash_update_stream ( resource context, resource handle [, int length] )

参数

context

Hashing context returned by hash_init().

handle

Open file handle as returned by any stream creation function.

length

Maximum number of characters to copy from handle into the hashing context.

返回值

Actual number of bytes added to the hashing context from handle.

范例

例 750. hash_update_stream() example

<?php
$fp
= tmpfile();
fwrite($fp, 'The quick brown fox jumped over the lazy dog.');
rewind($fp);

$ctx = hash_init('md5');
hash_update_stream($ctx, $fp);
echo
hash_final($ctx);
?>

上例将输出:

5c6ffbdd40d9556b73a21e63c3e0e904