//Output result

      
array(1) {
      
[0]=>
      
array(3) {
      
[0]=>
      
string(1) "1"
      
[1]=>
      
string(0) ""
      
[2]=>
      
string(0) ""
      
}
      
}
      


      
Why is it output 3 subscripts? Where did the third subscript come from?