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7 years ago
// 1)  you can store the name of constant in default variable
 //     and use it without identify it's name :)

        $str= "constName";
      
        define("constName","this is constant");

        echo constant($str);
       

       output:
             this is constant

// 2)  good for dynamic generating  constants
       

         function generateConst( $const ,  $value , $sensitivity=TRUE )
             {
              
                    define( "$const" , "$value ",$sensitivity);
              }

              $CONST="cost";
              $VALUE="100$";
              
             generateConst( $CONST , $VALUE);
                          
             echo constant($const);

        output:
                100$
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