PHP: how to fill an array with keys and values so 1 = 1, 2 = 2, 3 = 3 etc

I am looking to do something like (psuedo_code)

$myarray = fill_array_keys_and_values_from_parameter1_until_parameter2(18, 50);

So that I get

$myarray= array(

'18' => '18',
'1开发者_如何学运维9' => '19',
...
'50' => '50'
)

without having to a for loop ideally. Is there such a PHP function, I had a browse of the manual but could not see what I was looking for.

Thanks in advance

I don't think there is a specific function that can do this (although there are a couple that come close.)

What about doing this?

$values = range(18, 50);
$array = array_combine($values, $values);

Using a for loop:

$arr = array();
foreach (range(18, 50) as $i) {
    $arr[$i] = $i;
}

simshaun's solution is much better, though.