Php: how to make variables work in mysql instructions -

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I am trying to create one last online system and this is the code that must be run after login 

  $ name = $ user ['username'] mysql_query ("utidad user set last_action = now () WHERE username = $ name"); $ Message = "connected";

In general, if I type this code in the php tag the name is displayed 

  resonance $ user ['username'] < / Code>

but it seems that this variable does not work in mysql_query

Why? How should I set "$ name" to do this work?

You will need to type '$ name' . Try: 

  mysql_query ("UPDATE user SET last_activity = now (WHERE user name = '$ name'");

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