What could be causing the "undefined function" error when using the mail() function in PHP?

The "undefined function" error when using the mail() function in PHP typically occurs when the mail() function is not enabled or supported on the server. To solve this issue, you need to ensure that the server has the necessary configurations to support the mail() function, such as a mail server like Sendmail or Postfix. 

// Check if the mail function is enabled
if (function_exists('mail')) {
    // Your mail function code here
    $to = "recipient@example.com";
    $subject = "Test Email";
    $message = "This is a test email.";
    $headers = "From: sender@example.com";
    
    mail($to, $subject, $message, $headers);
} else {
    echo "The mail function is not enabled on this server.";
}

Keywords

mail() undefined function PHP error function

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