php - CodeIgniter - Get a variable within quotes. -

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I have to get a variable between the quotation marks in the codeigniter. But how can I complete it? 

  $ this-> Db- & gt; Where ('boxing' gt; ', $ start); For example $ beginning value is the 2014-03-17 codeigniter sees it like this:  
 
  $ this - & gt; Db- & gt; Where ('boekingsdatum & gt;', 2014-03-17);    
 But I would like to like it:  
 
  $ this-> Db- & gt; Where ('Boekingsdatum & gt;', '2014-03-17');    
 So I thought the answer would be something like this:  
 
  $ this-> Db- & gt; Where ('bokingstatum'; ',' $ start ');   
 But then the variable is not written as a variable    
 
 
 You can do for dates and only for dates  
  $ this- & gt; Db- & gt; Where ('bokingstatum', date ("YMD", strotomom ($ start));

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