cannot pass parameter 1 by reference

Zorono

So I'm trying to check if the value of the variable is equal to the last row of the array, if($ver == end(Self::Supported_Version) {}but it results in Cannot Pass Parameter 1 by referencean error...

my code:

namespace John; 
class SP {

const Supported_Version = array('a', 'b', 'c'); 

    public function VersionCheck()
    {
        return ($ver == end(Self::Supported_Version) ? (True)  : (False)); 
     }
 }

Abra Cadaver

You cannot create a reference to a constant because it cannot be changed and can only end()accept parameters by reference. If you really need a constant, assign to a temporary variable. You can do this during a call.

Also, you don't need a ternary, because ==the comparison will return an trueOR false:

return ($ver == end($s = Self::Supported_Version));

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