PHP/MySQL Update code -


I am trying to call a line update call from mysql database from php. It fails, but when I try to call a new line, it is prepared in the same way. Value ('username', '$ username', '$ password', '$ studycode', '$ description) ',' $ Server '));

But this code fails 

  $ result = mysql_query ("UPDATE auth SET username =' $ Username ', password =' ​​$ password ', studycode =' $ studycode ', description =' $ description ', server =' $ server 'where index =' $ id 'LIMIT 1; ");

The first column for the index table and its key / ID is

EDIT: OK so I just went to mysql admin And my code tried the exact command sent to track the error. 

  UPDATE auth SET username = 'username', password = 'password', study code = 'ab 9 102' , Description = 'test change', server = 'server 2' where index = '5' limit1;

gives me an error 

  # 1064 - There is an error in your SQL syntax; Use the 'index =' 5 'LIMIT 1' near the line 1 to use the correct syntax for manual related to your MySQL server version Mr. check

Maybe a reserved keyword issue with the index. Try: 

  $ result = mysql_query ("UPDATE auth SET username = '$ username', password = '$ password', studycode = '$ studycode', description = '$ description', Server = '$ server' where `index = '$ id' ');

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