Use single quotes instead of double

Author: michalbundyra

src/UserRepository/Htpasswd.php

@@ -26,7 +26,7 @@ public function __construct(string $filename)
     {
         if (! file_exists($filename)) {
             throw new Exception\InvalidConfigException(sprintf(
-                "I cannot access the htpasswd file %s",
+                'I cannot access the htpasswd file %s',
                 $filename
             ));
         }
@@ -38,7 +38,7 @@ public function __construct(string $filename)
      */
     public function authenticate(string $credential, string $password = null): ?UserInterface
     {
-        if (! $handle = fopen($this->filename, "r")) {
+        if (! $handle = fopen($this->filename, 'r')) {
             return null;
         }
         $found = false;

src/UserRepository/PdoDatabase.php

@@ -34,7 +34,7 @@ public function __construct(PDO $pdo, array $config)
     public function authenticate(string $credential, string $password = null): ?UserInterface
     {
         $sql = sprintf(
-            "SELECT * FROM %s WHERE %s = :username",
+            'SELECT * FROM %s WHERE %s = :username',
             $this->config['table'],
             $this->config['field']['username']
         );