Trying to encapsulate an email in <> - php

Question

I'm trying to pull a first name, last name, and email from a data base and trying to put into Firstname Lastname , with PHP. Every time I try to echo the data I only get Firstname Lastname. The email and <> doesn't show up? Anyone know how I can echo .
Here's the code:
while($row = mysqli_fetch_assoc($res)){
echo $row['firstname'] . " " . $row['lastname'] . " <" . $row['email'] . ">,";
}

Answer 1

Your code works fine, but < and > characters form a HTML tag, that is why you don't see the mail.
If you look at the source code of your echo, you will see the <mail> appearing.
You can also do this :
while($row = mysqli_fetch_assoc($res)){
echo htmlspecialchars($row['firstname'] . " " . $row['lastname'] . " <" . $row['email'] . ">,");
}
htmlspecialchars will transform < and > to their HTML code, so they will be visible even if you're not looking at the source.
A useful function to have is this one :
// Echoes the string in a HTML friendly way
function echoHTML($str)
{
echo htmlspecialchars($str);
}
while($row = mysqli_fetch_assoc($res)){
echoHTML($row['firstname'] . " " . $row['lastname'] . " <" . $row['email'] . ">,");
}
PS : be careful about the last comma if you want to concatenate email adresses, you will have a trailing , at the end of the list of mails. Here is how to avoid it :
$adresses = [];
while($row = mysqli_fetch_assoc($res))
{
// No more "," here
$adresses[] = $row['firstname'] . " " . $row['lastname'] . " <" . $row['email'] . ">";
}
echoHTML(implode(', ', $adresses));