PHP md5() gives different output then MySQL md5

问题

I'm trying to set up a login system, but I can't solve one problem: PHP is giving me an other output with md5(); than MySQL...

For example, in PHP:

$password = md5("brickmasterj");
return $password;

Returns:

3aa7b18f304e2e2a088cfd197351cfa8

But the MySQL equivalent gives me a shorter version:

3aa7b18f304e2e2a08

What's the problem? And how do I work with this while checking passwords?

回答1:

I guess the problem in the length of column of your table, set the length of password field to at least 32

回答2:

No way MySQL returns it of a length of < 32. If you would do a simple query like SELECT md5('brickmasterj'), you would see. Now you are most likely inserting the value into a column which is not wide enough.

回答3:

Is your database field 32 characters long? Are you writing to the database using mysql's md5?

回答4:

The hash size if always fixed. In your case the hash size is 128 bits. When converted to a ascii string it would be a 32 character string that contains only hexadecimal digits. so if you are storing variable character the length should be atleast 32 example:password varchar(32) should go in mysql table then you can call using php using select password from table where password =md5($password);

来源：https://stackoverflow.com/questions/11540744/php-md5-gives-different-output-then-mysql-md5