Converting jquery string to php - php

Question

So I have a php which gets set of coordinates from the database , I want it to run through a jquery variable.
This is the PHP -
$sql = "SQL that works";
$vari = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($loc))
{echo "[";
echo "''";
echo $row['cor1'];
echo ",";
echo $row['cor2'];
echo "]";
}
This is the jquery that I want it to pass through in this form -
var markers = [
['', 51.503454,-0.119562],
['', 51.499633,-0.124755]
];

Answer 1

Actually you have to change your php code like below:-
$sql = "SQL that works";
$vari = mysqli_query($con,$sql);
$data = array(); //create an rray variable
while($row = mysqli_fetch_assoc($loc)){ // use assoc for lighter $row array
$data[] = array('',$row['cor1'],$row['cor2']); // create sub-array and assign to final array
}
echo json_encode($data); //return final data to ajax
Note:-Now decode this json in your jQuery via parseJSON() and do further code.

Answer 2

If you don't want to use ajax, you can do something like this.
For the PHP,
...
$vari = mysqli_query($con,$sql);
$coOrds = mysqli_fetch_array($loc);
$coOrds = json_encode($coOrds);
?>
For the JS,
var coOrdsJson = <?php echo $coOrds; ?>;
var coOrds = $.parseJSON(coOrdsJson);
var markersArr = [];
for (var i=0; i < coOrds.length; i++ ) {
markersArr[] = "['', " + coOrds[i].cor1 + ", " + coOrds[i].cor2 + "]";
}
var markers = markersArr.join(',');
markers = "[" + markers + "]";