hash_update_stream Pump data into an active hashing context from an open stream php函数


hash_update_stream

(PHP 5 >= 5.1.2, PECL hash >= 1.1)

hash_update_streamPump data into an active hashing context from an open stream

说明

int hash_update_stream ( resource $context , resource $handle [, int $length = -1 ] )

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

Example #1 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);
?>

以上例程会输出:

5c6ffbdd40d9556b73a21e63c3e0e904

参见

  • hash_init() - Initialize an incremental hashing context
  • hash_update() - Pump data into an active hashing context
  • hash_final() - Finalize an incremental hash and return resulting digest
  • hash() - Generate a hash value (message digest)
  • hash_file() - Generate a hash value using the contents of a given file



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