How can the "Undefined array key" error be resolved in PHPMailer when sending emails?

The "Undefined array key" error in PHPMailer typically occurs when trying to access an array key that does not exist. To resolve this issue, you should first check if the array key exists before trying to access it. This can be done using the isset() function to avoid the error. 

if(isset($_POST['submit'])) {
    $mail = new PHPMailer(true);
    // Rest of the code for sending email
}

Keywords

PHP PHPMailer Undefined array key error handling email sending

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