从sql保存并获取哈希值

first I create a hash code and save it in my database:

$key = md5(uniqid(rand(), true));
$update = mysqli_query($conn, "UPDATE my_table SET md5key = MD5('$key') WHERE id = 1");

But the $key does not match the code in the database?

$key = e114e5bd4c8551d4e46a636d0c087b0e database = c00855d30f0c2c2f527b95f8be86a8b3

My field in the database has the following option:

md5key varchar(255) utf8_general_ci

Whats wrong here?

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I think that's because your $key variable has an MD5 hash already, but when you make the update query, you use a MD5 function again, so the value inserted in the database will be different.

Just do this:

$key = md5(uniqid(rand(), true));
$update = mysqli_query($conn, "UPDATE my_table SET md5key = '$key' WHERE id = 1");