How to send email to all Wordpress users - php

Question

I am trying to send all of my users an email for a custom event. For this, I have written the following code but it is not working. What am I doing wrong?
//send mail to all users
$result= $wpdb->get_var( $wpdb->prepare("SELECT user_email FROM $table_users"));
foreach($result as $email) {
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers.= "From:mysite<info#mysite.com>\r\n";
$message = "<b>Dear! user</b>,<br/><br/> A new share is available to purchase
for amount $".$sellamt."<br>this is an automated mail.pls don't reply to this mail. ";
$send=mail($email,"mysite:New share Available to Purchase!",$message,$headers);
}
header('Location: /offer_csuccess');
exit();

Answer 1

Use get_users function to get all users depending on roles or any parameter you pass.
$users = get_users();
foreach( $users as $user ) {
wp_mail( $user->user_email, "New Share Available to Purchase!", $message );
}
Also using WordPress you have advantage not to mention the headers every time. You just need to use wp_mail. It really does sending email simpler.
Hope it help :)

Answer 2

get all user function get_users();
$all_users = get_users();
foreach ($all_users as $user) {
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers.= "From:mysite<info#mysite.com>\r\n";
$message = "<b>Dear! user</b>,<br/><br/> A new share is available to purchase
for amount $".$sellamt."<br>this is an automated mail.pls don't reply to this mail. ";
$send=mail($user->user_email,"mysite:New share Available to Purchase!",$message,$headers);
}
exit();