php: how to get associative array key from numeric index?

Question

If I have:

$array = array( 'one' =>'value', 'two' => 'value2' ); 

how do I get the string one back from $array[1] ?

Answer 1

You don't. Your array doesn't have a key [1]. You could:

• Make a new array, which contains the keys:

  $newArray = array_keys($array); echo $newArray[0]; 

  But the value "one" is at $newArray[0], not [1].
  A shortcut would be:

  echo current(array_keys($array)); 

• Get the first key of the array:

   reset($array);  echo key($array); 

• Get the key corresponding to the value "value":

  echo array_search('value', $array); 

This all depends on what it is exactly you want to do. The fact is, [1] doesn't correspond to "one" any which way you turn it.