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

Solution 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.

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

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

Which will output:

one

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];

Or if you need it in a loop

foreach ($array as $key => $value)
{
    echo $key . ':' . $value . "\n";
}
//Result: 
//one:value
//two:value2