How to read the specific set elements from an array - PHP -

i have array, trying store first element(15) in 1 array(xaxis) , second element(42) fifth(23) in array(yaxis) , again want store sixth element(15) in array - xaxis , later 4 elements in yaxis. have more hundred elements in source array , want follow pattern store in arrays.

array (     [0] => 15     [1] => 42     [2] => 55     [3] => 42     [4] => 23     [5] => 15     [6] => 38     [7] => 40     [8] => 53     [9] => 10     [10] => 15 ) 

thanks.

use loops :

$array = array (     [0] => 15     [1] => 42     [2] => 55     [3] => 42     [4] => 23     [5] => 15     [6] => 38     [7] => 40     [8] => 53     [9] => 10     [10] => 15 ) $x = {}; $y = {}; $step = 0; ($i=0; $i < count($array); $i = $i){ if ($step == 0){ array_push($x, $array[$i]); $i = $i + 1; } else { array_push($y, $array[$i]); array_push($y, $array[$i+1]); array_push($y, $array[$i+2]); array_push($y, $array[$i+3]); $i = $i + 4; } } 

dont forget sure these steps 1-2-3-4 possible. array 10/15/20 long!
else php return (silecent) error.