getPost.php

<?php 

    include_once 'dbconfig.php';

    $conn = mysqli_connect($dbconfig["host"], $dbconfig["user"], $dbconfig["password"], $dbconfig["name"]) or die("Errore: ".mysqli_connect_error());
    $username = mysqli_real_escape_string($conn, $_GET["q"]);

    $query = "SELECT * FROM posts WHERE username ='".$username."'";

    $res = mysqli_query($conn, $query);

    $jsonPosts = array();

    while($row = mysqli_fetch_assoc($res)){
        $jsonPosts[]=$row;
    }

    for ($i=0; $i < count($jsonPosts); $i++) { 
        $query_1 = "SELECT * FROM likes_for_posts WHERE user='$username' AND post_id=".$jsonPosts[$i]["id"]."";
        $res1 = mysqli_query($conn, $query_1);
        $row = mysqli_fetch_assoc($res1);
        if($row){
            $jsonPosts[$i]["ok"] = true;
        } else {
            $jsonPosts[$i]["ok"] = false;
        }
    }
    

    echo json_encode($jsonPosts);
    mysqli_free_result($res);
    mysqli_close($conn);
?>