It's sometimes necessary to hash the same file with different algos,
<?php
function hash_file_multi($algos = [], $filename) {
if (!is_array($algos)) {
throw new \InvalidArgumentException('First argument must be an array');
}
if (!is_string($filename)) {
throw new \InvalidArgumentException('Second argument must be a string');
}
if (!file_exists($filename)) {
throw new \InvalidArgumentException('Second argument, file not found');
}
$result = [];
$fp = fopen($filename, "r");
if ($fp) {
foreach ($algos as $algo) {
$ctx[$algo] = hash_init($algo);
}
while (!feof($fp)) {
$buffer = fgets($fp, 65536);
foreach ($ctx as $key => $context) {
hash_update($ctx[$key], $buffer);
}
}
foreach ($algos as $algo) {
$result[$algo] = hash_final($ctx[$algo]);
}
fclose($fp);
} else {
throw new \InvalidArgumentException('Could not open file for reading');
}
return $result;
}
?>
Which would be used like:
<?php
$result = hash_file_multi(['md5', 'sha1', 'sha256'], 'path/to/file.ext');
var_dump($result['md5'] === hash_file('md5', 'path/to/file.ext')); var_dump($result['sha1'] === hash_file('sha1', 'path/to/file.ext')); var_dump($result['sha256'] === hash_file('sha256', 'path/to/file.ext'));
