The PHP class used to parse the.htpasswd file

.htpasswd file example:
user1:{SHA}kGPaD671VNU0OU5lqLiN/h6Q6ac=
user2:{SHA}npMqPEX3kPQTo+x/+ZckHDrIcQI=
user3:{SHA}q1Fh2LTUjjkncp11m0M9WUH5Zrw=

 
class Htpasswd { 
private $file = ''; 
private $salt = 'AynlJ2H.74VEfI^BZElc-Vb6G0ezE9a55-Wj'; 
private function write($pairs = array()) { 
$str = ''; 
foreach ($pairs as $username => $password) { 
$str .= "$username:{SHA}$password\n"; 
} 
file_put_contents($this -> file, $str); 
} 
private function read() { 
$pairs = array(); 
$fh = fopen($this -> file, 'r'); 
while (!feof($fh)) { 
$pair_str = str_replace("\n", '', fgets($fh)); 
$pair_array = explode(':{SHA}', $pair_str); 
if (count($pair_array) == 2) { 
$pairs[$pair_array[0]] = $pair_array[1]; 
} 
} 
return $pairs; 
} 
private function getHash($clear_password = '') { 
if (!empty($clear_password)) { 
return base64_encode(sha1($clear_password, true)); 
} else { 
return false; 
} 
} 
public function __construct($file) { 
if (file_exists($file)) { 
$this -> file = $file; 
} else { 
die($file." doesn't exist."); 
return false; 
} 
} 
public function addUser($username = '', $clear_password = '') { 
if (!empty($username) && !empty($clear_password)) { 
$all = $this -> read(); 
if (!array_key_exists($username, $all)) { 
$all[$username] = $this -> getHash($clear_password); 
$this -> write($all); 
} 
} else { 
return false; 
} 
} 
public function deleteUser($username = '') { 
$all = $this -> read(); 
if (array_key_exists($username, $all)) { 
unset($all[$username]); 
$this -> write($all); 
} else { 
return false; 
} 
} 
public function doesUserExist($username = '') { 
$all = $this -> read(); 
if (array_key_exists($username, $all)) { 
return true; 
} else { 
return false; 
} 
} 
public function getClearPassword($username) { 
return strtolower(substr(sha1($username.$this -> salt), 4, 12)); 
} 
} 

Method of use

 
$passwdHandler = new Htpasswd('/home/myuser/.htpasswd'); 
// Add a user with name 'user1' and password 'I prefer to use passphrase rather than password.' if it doesn't exist in .htpasswd. 
$passwdHandler -> addUser('user1', 'I prefer to use passphrase rather than password.'); 
// Delete the user 'user1' if it exists in .htpasswd. 
$passwdHandler -> deleteUser('user1'); 
// Check if user 'user1' exists in .htpasswd. 
if ($passwdHandler -> doesUserExist('user1')) { 
// User 'user1' exists. 
}