Can we send mail in php without using any library

Yes, you can send mail in PHP without using any library. PHP has a built-in function called mail() that allows you to send an email. Here is an example of how to use it:

<?php
$to = '[email protected]';
$subject = 'Test email';
$message = 'This is a test email message.';
$headers = 'From: [email protected]'. "\r\n".
    'Reply-To: [email protected]'. "\r\n".
    'MIME-Version: 1.0'. "\r\n".
    'Content-Type: text/plain; charset=UTF-8';

if (mail($to, $subject, $message, $headers)) {
    echo 'Email sent successfully.';
} else {
    echo 'Failed to send email.';
}
?>

In this example, the mail() function takes four parameters:

1. $to: The recipient's email address.
2. $subject: The subject of the email.
3. $message: The message body of the email.
4. $headers: The headers of the email.

The $headers parameter is a string that contains the email headers. You can add multiple headers by separating them with \r\n. In this example, we're setting the From, Reply-To, MIME-Version, and Content-Type headers.

The mail() function returns true if the email is sent successfully, and false otherwise.

Note that the mail() function is a low-level function that requires you to specify the email headers manually. This can be error-prone and may not work correctly in all situations. For more complex email sending tasks, it's recommended to use a library like PHPMailer or SwiftMailer that provides a higher-level interface and more features.