Question

I have that code:

$mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);

$result = $mysqli->query("SELECT id FROM User");
echo("users: " . $result->num_rows ."<br/>");

function echoUserNum()
{
    $result = $mysqli->query("SELECT id FROM User");
    echo("users: " . $result->num_rows ."<br/>");
}
echoUserNum();

It prints the number of users only once (first echo call). Where is the problem?

Answer 1

$mysqli is out of scope in the function echoUserNum. Try global, or pass the connection

function echoUserNum()
{
    global $mysqli;
    $result = $mysqli->query("SELECT id FROM User");
    echo("users: " . $result->num_rows ."<br/>");
}

or

function echoUserNum($mysqli)
{
    $result = $mysqli->query("SELECT id FROM User");
    echo("users: " . $result->num_rows ."<br/>");
}
echoUserNum($mysqli);