Generate a hash value using the contents of a given file
Syntax
hash_file(
string $algo,
string $filename,
bool $binary = false,
array $options = []
): string|falseParameters
algoName of selected hashing algorithm.
filenameThe filename of the file to hash.
binaryWhen set to true, outputs raw binary data. false outputs lowercase hexits.
optionsAn array of options for the various hashing algorithms. Currently, only the "seed" parameter is supported by the MurmurHash variants.
Return
Returns a string containing the calculated message digest as lowercase hexits unless binary is set to true in which case the raw binary representation of the message digest is returned.
Examples
1 · algo filename
<? $algo = 'sha384'; $filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt'; $return = hash_file($algo, $filename); echo $return; ?>
3519fe5ad2c596efe3e276a6f351b8fc0b03db861782490d45f7598ebd0ab5fd5520ed102f38c4a5ec834e98668035fc
2 · binary
<? $algo = 'sha384'; $filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt'; $binary = true; $return = hash_file($algo, $filename, $binary); echo $return . PHP_EOL . bin2hex($return); ?>
5�Z�Ŗ���v��Q�� ۆ�I E�Y�� ��U �/8ĥ�N�f�5� 3519fe5ad2c596efe3e276a6f351b8fc0b03db861782490d45f7598ebd0ab5fd5520ed102f38c4a5ec834e98668035fc
3 · options · empty
<? $algo = 'sha384'; $filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt'; $binary = false; $options = []; $return = hash_file($algo, $filename, $binary, $options); echo $return; ?>
3519fe5ad2c596efe3e276a6f351b8fc0b03db861782490d45f7598ebd0ab5fd5520ed102f38c4a5ec834e98668035fc
4 · options · seed
<? $algo = 'murmur3f'; $filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt'; $binary = false; $options = ['seed' => 42]; $return = hash_file($algo, $filename, $binary, $options); echo $return; ?>
2365fb86a62c2c3ba0c2a44a316b36e2
