{
  "points": [
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999]
  ]
}

$sql = "SELECT latlong from requests";
$result = $con->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo $row['latlong'] . "<br>";
    }
} else {
    echo "0 results";
}
$con->close();

$str = '{
  "points": [
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999],
    [52.93839800000001,-1.1425212999999999]
  ]
}';
$arr = json_decode($str,true); // decode to array

foreach($arr["points"] as $row){ // loop points array
    echo "lat " . $row[0] . "n";
    echo "lon " . $row[1] . "nn";
}

lat 52.938398
lon -1.1425213

lat 52.938398
lon -1.1425213

lat 52.938398
lon -1.1425213

lat 52.938398
lon -1.1425213

lat 52.938398
lon -1.1425213