hash_file

Generate a hash value using the contents of a given file ()
string hash_file ( string algo, string filename [, bool raw_output] )

参数

algo

Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..)

filename

URL describing location of file to be hashed; Supports fopen wrappers.

raw_output

When set to TRUE, outputs raw binary data. Default value (FALSE) outputs lowercase hexits.

返回值

Returns a string containing the calculated message digest as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned.

范例

例 745. Using hash_file()

<?php
/* Create a file to calculate hash of */
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');

echo
hash_file('md5', 'example.txt');
?>

上例将输出:

5c6ffbdd40d9556b73a21e63c3e0e904