Not able to get the actual values from SQL result php - php

Question

I am having some trouble getting some values from my sql query in php
This is my php code:
<?php
include "init.php";
$stmt = "SELECT email FROM Customer ";
$result = $dbcon -> prepare($stmt);
$result->execute();
$result->store_result();
while($result -> fetch()){
// This line below works
echo "Works";
// This doesn't work
echo $result['email'];
}
?>

Answer 1

You need to use bind_result() to retrieve the values returned by the query.
include "init.php";
$stmt = "SELECT email FROM Customer ";
$result = $dbcon -> prepare($stmt);
$result->execute();
$result->store_result();
$result->bind_result($email);
while($result -> fetch()){
// This line below works
echo "Works";
echo $email;
}

Answer 2

To start, mysqli::prepare doesn't return a mysqli_result, it returns a mysqli_stmt. You then have to execute that mysqli_stmt and either fetch directly from it into a bound variable, or extract a mysqli_result and fetch from that. There are several ways to do what you want:
$qry = "SELECT email FROM Customer ";
$stmt = $dbcon->prepare($qry);
$stmt->execute();
$stmt->bind_result($email); // Bind variable to statement
while($stmt->fetch()) // Iterate through statement
{
// This line below works
echo "Works";
echo $email;
}
Or:
$qry = "SELECT email FROM Customer ";
$stmt = $dbcon->prepare($qry);
$stmt->execute();
$rslt = $stmt->get_result(); // Retrieve result set
while($row = $rslt->fetch_assoc()) // Iterate through result
{
// This line below works
echo "Works";
echo $row['email'];
}
Or:
$qry = "SELECT email FROM Customer ";
$stmt = $dbcon->prepare($qry);
$stmt->execute();
$rslt = $stmt->get_result(); // Retrieve result
$resArray = $rslt->fetch_all(MYSQLI_ASSOC)); // Convert to array
foreach ($resArray as $row) // Iterate through array
{
// This line below works
echo "Works";
echo $row['email'];
}
As is my custom, I leave error handling as an exercise for the reader.