PHP use variables in an array -


Currently I'm setting an array like this ... 

  public function Setup_array () {$ columns = array ('date1' => '2014-01-24', 'date2' => '2014-02-14', 'date3' => '2014-03 -11 ',' date4 '= & gt;' 2014-04-01 '); Return $ column; }   
 This works, but I would like to use those variables that are already set in place of dates ...  
  public function Setup_Are () {$ Columns = array ('date1' => '$ date1', 'date2' => 'date1', 'date3' => 'date1', 'date4' = & Gt; '$ date1'); Return $ column; }   
 I have tried to do this, although $ derivatives variables are available and set, it actually prints instead of $ 1 or receives variable value again.  
 What am I doing wrong?   
 
 
 remove quote  
  public function setup_are ($ Date1) {$ Columns = array ('date1' = & gt; $ date1, 'date2' => $ date1, 'date3' = & gt; $ date1, 'date4' => $ date1); Return $ column; }

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