PHP Sql, returns one row - php

Question

I have the following code that calls a DB function that retrieves all rows from a table and then echo's them in JSON.
$key = $db->getKeyPermissions();
if ($key != false) {
// use is found
$response["error"] = FALSE;
$response["key"]["endpoint_name"] = $key["endpoint_name"];
$response["key"]["live"] = $key["live"];
$response["key"]["activity_name"] = $key["activity_name"];
echo json_encode($response);
} else {
This is the DB function
public function getKeyPermissions()
{
$stmt = $this->conn->prepare("SELECT * FROM key_permissions WHERE 1");
if ($stmt->execute()) {
$key = $stmt->get_result()->fetch_assoc();
$stmt->close();
return $key;
} else {
return NULL;
}
}
This all works fine except that it only returns the first row and then stops. Read that you have to loop the fetch_assoc() but I couldn't get this working. I would like all rows to be pushed into $key and returned, but all attempts result in an array conversion and non-object errors. Can somebody help me along the way?
EDIT:
public function getKeyPermissions()
{
$stmt = $this->conn->prepare("SELECT * FROM key_permissions WHERE 1");
if ($stmt->execute()) {
$key = array();
while($row = $stmt->get_result()->fetch_assoc()) { //Call to a member function fetch_assoc() on a non-object
$key .= $row; // Array to string conversion
}
$stmt->close();
return $key;
} else {
return NULL;
}
}

Answer 1

You want to call get_result exactly once, and fetch_assoc as long as there are rows:
$result = $stmt->get_result();
$key = array();
while ($row = $result->fetch_assoc()) {
$key[] = $row;
}
return $key;