To send email using PHP some classes and files need to be include. code example
Example: core php mail function without phpmailer
<?php
ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(-1);
session_start();
$to = '[email protected]';
$subject = 'Subject xxxxx xxxxxx';
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=charset=utf-8\r\n";
$headers .= "From: " . $_POST['email'] . "\r\n";
$headers .= "CC: [email protected]\r\n";
$message = "<html><body>";
$message .= '<table style="border-color: #666; background: #eee; cellpadding="10">';
$message .= "<tr><td><strong>Name:</strong> </td><td>" . $_POST['username'] . "</td></tr>";
$message .= "<tr><td><strong>Email:</strong> </td><td>" . $_POST['email'] . "</td></tr>";
$message .= "</table>";
$message .= "</body></html>";
echo $message;
$response=mail($to, $subject, $message, $headers);
if($response==1)
{
echo "<script language='javascript' type='text/javascript'>
window.location = 'index.html';
</script>";
}
else{
echo
"<script language='javascript' type='text/javascript'>
alert('mail send failed');
</script>";
}
?>