Drop php < 7 (#45)

composer.json

@@ -21,7 +21,7 @@
 
     ],
     "require": {
-        "php": "^5.6 || ^7.0",
+        "php": "^7.0",
         "paragonie/random_compat": "^2.0"
     },
     "require-dev": {

lib/FixedBitNotation.php

@@ -37,7 +37,7 @@ class FixedBitNotation
      * @param bool   $padFinalGroup     Add padding to end of encoded output
      * @param string $padCharacter      Character to use for padding
      */
-    public function __construct($bitsPerCharacter, $chars = null, $rightPadFinalBits = false, $padFinalGroup = false, $padCharacter = '=')
+    public function __construct(int $bitsPerCharacter, string $chars = null, bool $rightPadFinalBits = false, bool $padFinalGroup = false, string $padCharacter = '=')
     {
         // Ensure validity of $chars
         if (!is_string($chars) || ($charLength = strlen($chars)) < 2) {

lib/GoogleAuthenticator.php

@@ -36,7 +36,7 @@ class GoogleAuthenticator
      * @param int $passCodeLength
      * @param int $secretLength
      */
-    public function __construct($passCodeLength = 6, $secretLength = 10)
+    public function __construct(int $passCodeLength = 6, int $secretLength = 10)
     {
         $this->passCodeLength = $passCodeLength;
         $this->secretLength = $secretLength;
@@ -144,7 +144,7 @@ protected static function hashToInt($bytes, $start)
      *
      * @see http://codereview.stackexchange.com/q/13512/6747
      */
-    private function codesEqual($known, $given)
+    private function codesEqual(string $known, string $given): bool
     {
         if (strlen($given) !== strlen($known)) {
             return false;

sample/web/Users.php

@@ -11,7 +11,7 @@
 
 class Users
 {
-    public function __construct($file = '../users.dat')
+    public function __construct(string $file = '../users.dat')
     {
         $this->userFile = $file;