Why does PHP give a parse error if you do:

      echo array_keys($arr)[0];

It makes you assign the result of the function to a var first like this:

      $arr = array_keys($arr);
      echo $arr[0];

I just want to grab the 1st element of the array. Why does it make you do
it in 2 lines instead of letting you index right on the array that results
from the function?


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