md5_file

<?

$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/1.txt';

$return = md5_file($filename);

echo $return;

?>

5d41402abc4b2a76b9719d911017c592

<?

$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/1.txt';
$binary = true;

$return = md5_file($filename, $binary);

echo $return . PHP_EOL;

$format = 'H*';

$unpack = unpack($format, $return);

$array_pop = array_pop($unpack);

echo $array_pop;

?>

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5d41402abc4b2a76b9719d911017c592