PHP (mysqli) to find single value [duplicate] - php

Question

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Single result from database using mysqli
(6 answers)
Closed 1 year ago.
I know how to search using mysqli to find if there is at least one match. How do I go about retrieving another value from a found row. It must just require changing 1 or 2 things.
Imagine I have the following DB:
ID | emailaddress | password
1 | dummy#email.com | DUMB1PASS
2 | second#email.com | DUMB2Pass
I can use the following code to verify if the the email address "dummy#email.com" exists. How would I look up the password associated with that row (i.e. the row containing dummy#email.com).
$email = "dummy#email.com";
$servername = "correct"; $username = "correct"; $DBpass = "correct"; $dbname = "correct";
$conn = new mysqli($servername, $username, $DBpass, $dbname);
if ($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT emailaddress FROM registration WHERE emailaddress = '$email'";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
echo "we found a match";
}
else
{
echo "we did not find a match";
}
I imagine I can do something like:
$email = "dummy#email.com";
$servername = "correct"; $username = "correct"; $DBpass = "correct"; $dbname = "correct";
$conn = new mysqli($servername, $username, $DBpass, $dbname);
if ($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT password FROM registration WHERE emailaddress = '$email'";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
echo "the value is '$result'";
}
else
{
echo "we did not find a match";
}
However, it produces this error:
Catchable fatal error: Object of class mysqli_result could not be converted to string in MYPAGE on line XX.
I think that the cause of this is likely that $result is an array or something. However, I don't know enough about sql/php to know if that is the problem, or how to pull the result from it if it is the case.
I'd really appreciate any help.

Answer 1

You need to fetch the row first, try this:
if ($result->num_rows) {
$row = $result->fetch_row();
echo 'the value is: ', $row[0];
}