I want to create a php function that i can use to get a particular user details and display the info gotten in my ProfileActivity when a user profile is been clicked in my app. so i wrote this php code to get user details from my database but when i run the code nothing is returned in my browser. please what could be causing this?

<?php
require("config.php");

function getdetails($id)
{
    $array = array();
    $q = mysql_query("SELECT * FROM 'users' WHERE 'id'=".$id);
    while($r = mysql_fetch_assoc($q))
    {
         $array['id'] =  $r['id'];
         $array['name'] =  $r['name'];
    }
    return $array;
}

function getId($name)
{
    $q = mysql_query("SELECT 'id' FROM 'users' WHERE 'name'=".$name);
    while($r = mysql_fetch_assoc($q))
    {
        return $r['id'];
    }

}   

?>

Table name and column name in MySQL query string should be without quotes or you can use backticks.

But string variable value should be in quotes

$q = mysql_query("SELECT `id` FROM `users` WHERE `name`='".$name."'"); 

this also is not good solution - use prepared statement to prevent from SQL injection

$stmt = mysqli_prepare($link, "SELECT `id` FROM `users` WHERE `name`=?");

and then bind variables, execute statement and fetch result

mysqli_stmt_bind_param($stmt, "s", $name);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt, $id);
mysqli_stmt_fetch($stmt);
mysqli_stmt_close($stmt);