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 ($fp) {
        // ini hash contexts
        foreach ($algos as $algo) {
            $ctx[$algo] = hash_init($algo);
        }

        // calculate hash
        while (!feof($fp)) {
            $buffer = fgets($fp, 65536);
            foreach ($ctx as $key => $context) {
                hash_update($ctx[$key], $buffer);
            }
        }

        // finalise hash and store in return
        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($result['md5'] === hash_file('md5', 'path/to/file.ext')); //true
var_dump($result['sha1'] === hash_file('sha1', 'path/to/file.ext')); //true
var_dump($result['sha256'] === hash_file('sha256', 'path/to/file.ext')); //true