get first and last element in array

hey there i have this array:

array(1) {
  ["dump"]=>
  string(38) "["24.0",24.1,24.2,24.3,24.4,24.5,24.6]"
}

my question:

how to get the first and the last element out from this array, so i will have:

$firstEle = "24.0";

and

$lastEle = "24.6";

anybody knows how to get those elements from the array?

i already tried this:

$arr = json_decode($_POST["dump"], true); 

$col0 = $arr[0];
$col1 = $arr[1];
$col2 = $arr[2];
$col3 = $arr[3];
$col4 = $arr[4];
$col5 = $arr[5];
$col6 = $arr[6];

i could chose $col0 and $col6, but the array could be much longer, so need a way to filter the first("24.0") and the last("24.6") element. greetings

reset() and end() does exactly this.

From the manual:

reset(): Returns the value of the first array element, or FALSE if the array is empty.

end(): Returns the value of the last element or FALSE for empty array.

Example:

<?php
    $array = array(24.0,24.1,24.2,24.3,24.4,24.5,24.6);
    
    $first = reset($array);
    $last = end($array);
    
    var_dump($first, $last);
?>

Which outputs:

float(24)
float(24.6)

DEMO

NOTE: This will reset your array pointer meaning if you use current() to get the current element or you've seeked into the middle of the array, reset() and end() will reset the array pointer (to the beginning and to the end):

<?php

$array = array(30.0, 24.0, 24.1, 24.2, 24.3, 24.4, 24.5, 24.6, 12.0);
    
// reset — Set the internal pointer of an array to its first element
$first = reset($array);

var_dump($first); // float(30)
var_dump(current($array)); // float(30)

// end — Set the internal pointer of an array to its last element
$last = end($array);
    
var_dump($last); // float(12)
var_dump(current($array)); // float(12) - this is no longer 30 - now it's 12

You can accessing array elements always with square bracket syntax. So to get the first use 0, as arrays are zero-based indexed and count($arr) - 1 to get the last item.

$firstEle = $arr[0];
$lastEle = $arr[count($arr) - 1];

As of PHP 7.3, array_key_first and array_key_last is available

$first = $array[array_key_first($array)];    
$last = $array[array_key_last($array)];