php - How to stop duplicate entries into database -

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Hi there I am trying to insert an array of information in the fields in a database through the selection of the checkbox, OK I am able to insert a duplicate when inserting which is not good I am using the following to insert the item 

  $ list = $ _POST ['sub']; // Quote $ queryQuery = 'tbl_list INSERT (`userId`,` subId')) for each lock for each value to run user information foreach ($ value as $ value) {// $$} value in database (value) \ ''. $ Id. '\', \ '. $ Value.' \ ')'; // Query $ Objects- & gt; Run query ($ listQuery); }  ,  sub id < / Code>):  
  Add ALTER TABLE tbl_list unique (`userId`,` sub id`)   
 Then, you should Use  INSERT IGNORE  or  to change again  to avoid it.

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