im failing to connect to my website database via php - php

Question

So i was following a tutorial on how i can create a website with a database using php and wamp
and am failing on connecting my website to my database
this is the code i wrote
<?php
require ("Entities/CoffeeEntity.php");
class CoffeeModel {
function GetCoffeeTypes() {
require 'Credentials.php';
$mysqli = new mysqli("$servername", "$username", "$password", "$dbname");
$result = $mysqli->query("Select a distinct Cofffee");
$types = array();
while ($row = $result->fetch_assoc()) {
array_push($types, $row[0]);
}
mysql_close();
return $types;
}
function GetCoffeeByType($type) {
require 'Credentials.php';
$mysqli = new mysqli("$servername", "$username", "$password", "$dbname");
$query = "SELECT * FROM coffee WHERE type LIKE '$type'";
$result = $mysqli->query("error");
$coffeeArray = array();
while ($row = $result->fetch_assoc()) {
$name = $row[1];
$type = $row[2];
$price = $row[3];
$roast = $row[4];
$country = $row[5];
$image = $row[6];
$review = $row[7];
$coffee = new CoffeeEntity(-1, $name, $type, $price, $roast, $country, $image, $review);
array_push($coffeeArray, $coffee);
}
mysql_close();
return $coffeeArray;
}
}
?>
and this is the error that i get
Edit:
ok so i figured out that i need to replace mysql to mysqli
and i tried but it still seems not working cause i guess am doing something wrong
this is the result i came through
<?php
require ("Entities/CoffeeEntity.php");
//Contains database related code for the Coffee page.
class CoffeeModel {
//Get all coffee types from the database and return them in an array.
function GetCoffeeTypes() {
require 'Credentials.php';
//Open connection and Select database.
$mysqli = new mysqli("$servername", "$username", "$password", "$dbname");
$result = $mysqli->query("Select a distinct Cofffee");
$types = array();
//Get data from database.
while ($row = $result->fetch_assoc()) {
array_push($types, $row[0]);
}
//Close connection and return result.
mysql_close();
return $types;
}
//Get coffeeEntity objects from the database and return them in an array.
function GetCoffeeByType($type) {
require 'Credentials.php';
//Open connection and Select database.
$mysqli = new mysqli("$servername", "$username", "$password", "$dbname");
$query = "SELECT * FROM coffee WHERE type LIKE '$type'";
$result = $mysqli->query("error");
$coffeeArray = array();
//Get data from database.
while ($row = $result->fetch_assoc()) {
$name = $row[1];
$type = $row[2];
$price = $row[3];
$roast = $row[4];
$country = $row[5];
$image = $row[6];
$review = $row[7];
//Create coffee objects and store them in an array.
$coffee = new CoffeeEntity(-1, $name, $type, $price, $roast, $country, $image, $review);
array_push($coffeeArray, $coffee);
}
//Close connection and return result
mysql_close();
return $coffeeArray;
}
}
?>
and this error shows up
can someone please help and make it work (sorry am really bad at this )

Answer 1

The query() method returns false one failure, see: https://www.php.net/manual/en/mysqli.query.php
You must check the method's result before calling fetch_assoc().
Your query is failing because the first argument of the method must be a valid query while you are passing the string error, because of that you are trying to call a method on a boolean.
Try changing line 36 with $result = $mysqli->query($query);