mysql - Separating comma broken words in PHP and selecting extra information -

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I am trying to look into it for a while, but no answer can be found which coding is correct Basically I have a 'mysql' table that is a 'connection' related to a user. These connections are different with a comma:

connection1, connection2, connection3, connection4, etc.

What do I need to do to isolate each one in an array like this? : 

  $ connection1 $ connection2 $ connection3 $ connection4   
 Then for each of these I need to select the sorting information from a different table, For example:  
  (selection number, user name from user where username = (all connections above))   
  
 
 
 It is simple to use the  explosion  function of php.  
  $ text = "connection1, connection2, connection3, connection4"; $ Res = Explosion (",", $ text); Forex currency ($ res = $ i = & gt; $ id) {ebb $ res [$ i]; }

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