The size of the hash, if it is always fixed. In your case, the hash size is 128 bits. When converted to ascii string, it will be a 32 character string containing only hexadecimal digits. therefore, if you store a variable character, the length must be at least 32 Example: password varchar(32) should go in the mysql table, then you can call using php using select password from table where password =md5($password);
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