jQuery get json_encode variable from PHP - php

Question

My PHP file retrieves data from a PostgreSQL DB. I have to send them back to my jQuery function in two different arrays. One is passed by using:
echo json_encode($tb);
and works fine, in my js file i get data correctly by using:
$.ajax({
type: "POST",
url: './DB/lb.php',
data: {d_p: oa},
success: function (tb) {
console.log(tb);
})
console output is as expected.
The other is always a PHP array, but I have to replace chars:
str_replace(array('[', ']'), '', htmlspecialchars(json_encode($ltb), ENT_NOQUOTES));
but if I write:
$.ajax({
type: "POST",
url: './DB/lb.php',
data: {d_p: oa},
success: function (tb, ltb) {
console.log(tb);
console.log(ltb);
})
console.log(ltb) simply outputs
success
what I'm I getting wrong?

Answer 1

The second parameter of succes is the response staus. This is the reason because you get success when logging tlb.
You can only return one JSON at at time, so combine them:
echo json_encode(array("other stuff", "tb" => $tb, "tbl" => array("some" => "data")));
On JS side you can simple acces them by index or key:
tb[0]; // "other stuff"
tb.tb; // content of $tb variable
tb.tbl; // {some: "data"}

Answer 2

The final working code:
PHP:
$tb = array();
$ltb = array();
while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC))
{
array_push($ltb, $row["x"], $row["y"]);
array_push($tb, $row["z"],$row["t"]);
}
echo json_encode(array('tb'=>$tb,'ltb'=>$ltb));
JS
$.ajax({
type: "POST",
url: './DB/lb.php',
dataType: 'json', // this is what I forgot!!!
data: {d_p: oa}, // passes variable for PHP function
success: function (response) {
console.log(response.tb+" "+ response.ltb);
$.each(response.tb, function( i, item ) {
// iterate over tb array
}
$.each(response.ltb, function( i, item ) {
// iterate over ltb array
}
});