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

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.

php key associative-array

$array = array( 'one' =>'value', 'two' => 'value2' );$allKeys = array_keys($array);echo $allKeys[0];

Which will output:

one

php key associative-array

If you only plan to work with one key in particular, you may accomplish this with a single line without having to store an array for all of the keys:

echo array_keys($array)[$i];

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