PHP password_verify似乎可以处理一个字符串，但不能处理另一个被认为相等的字符串

我将用户名和加密密码存储在mysql数据库中。仅用于测试，我还在数据库中以未加密的形式存储密码。

在下面的代码中，我从数据库中获得散列密码和未加密密码。然后我对未加密的密码进行加密。

给定的密码未通过存储的哈希或新哈希的密码验证测试。

存储的密码确实通过了存储哈希和新哈希的密码验证测试。

对strcmp的调用表示存储的密码和给定的密码相等。

这怎么可能呢？

[edit]：我正在从网页上的用户输入中传入$password。

// get hashed password from database
$sql = "SELECT member_password FROM member WHERE member_username=:username;";
$stmt = $db->prepare($sql);
$stmt->bindParam("username", $username);
$stmt->execute();
$hash = $stmt->fetch(PDO::FETCH_ASSOC);
$hash = $hash["member_password"];
// get unencrypated password from database
$sql = "SELECT member_unencrypted FROM member WHERE member_username=:username;";
$db = getConnection();
$stmt = $db->prepare($sql);
$stmt->bindParam("username", $username);
$stmt->execute();
$unencrypted = $stmt->fetch(PDO::FETCH_ASSOC);
$unencrypted = $unencrypted["member_unencrypted"];
// encrypt the unencrypted password that was retrieved from the database
$encrypted = password_hash($unencrypted, PASSWORD_DEFAULT);
// given password does not pass the new hash per this test
if(password_verify($password, $encrypted))
  echo '<br>given password passed new hash';
else 
  echo '<br>given password did not pass new hash';
// stored password does pass the new hash per this test
if(password_verify($unencrypted, $encrypted))
  echo '<br>stored password passed new hash';
else
  echo '<br>stored password did not pass new hash';
// given password does not pass the stored hash per this test.
if(password_verify($password, $hash)){
  echo '<br>given password passed stored hash';
else
  echo '<br>given password did not pass stored hash';
// stored password does pass the stored hash per this test.
if(password_verify($unencrypted, $hash))
  echo '<br>stored password passed stored hash';
else
  echo '<br>stored password did not pass stored hash';
// stored and given passwords are equal per this test.
if(strcmp($unencrypted, $password)) 
  echo '<br>stored and given passwords are equal';
else
  echo '<br>stored and given passwords are not equal';

输出：

given password did not pass new hash
stored password passed new hash
given password did not pass stored hash
stored password passed stored hash
stored and given passwords are equal