Single quotes are preferred over double quotes

Author: pensiero

src/Cryptor.php

@@ -57,12 +57,12 @@ public function __construct($cipher_algo = 'aes-256-ctr', $hash_algo = 'sha256',
 
         if (!in_array($cipher_algo, openssl_get_cipher_methods(true), false))
         {
-            throw new UnknownAlgoException("Unknown cipher algo {$cipher_algo}");
+            throw new UnknownAlgoException('Unknown cipher algo ' . $cipher_algo);
         }
 
         if (!in_array($hash_algo, openssl_get_md_methods(true), false))
         {
-            throw new UnknownAlgoException("Unknown hash algo {$hash_algo}");
+            throw new UnknownAlgoException('Unknown hash algo ' . $hash_algo);
         }
 
         $this->iv_num_bytes = openssl_cipher_iv_length($cipher_algo);
@@ -158,7 +158,7 @@ public function decryptString($in, $key, $fmt = null)
         // and do an integrity check on the size.
         if (strlen($raw) < $this->iv_num_bytes)
         {
-            throw new UnexpectedResultException('Data length ' . strlen($raw) . " is less than iv length {$this->iv_num_bytes}");
+            throw new UnexpectedResultException('Data length ' . strlen($raw) . ' is less than iv length ' . $this->iv_num_bytes);
         }
 
         // Extract the initialisation vector and encrypted data