Fatal error cannot redeclare phpmailerautoload

I am using PHPMailer to send emails from my local host.

I have written a function which is supposed to send emails to registered users who have chosen the option to receive them. (i.e. newsletter subscription, etc)

function email_users($subject, $body) {
    include('core/db/db_connection.php');
    $sql = "SELECT email, first_name FROM `_users` WHERE allow_email = 1";
    $query = mysqli_query($dbCon, $sql);
    while (($row = mysqli_fetch_assoc($query)) !== false) {
        $body = "Hello ". $row['first_name'] . ", <br><br>" . $body;
        email($row['email'], $subject, $body);
    }
}

The code that is calling the function:

if (isset($_GET['success']) === true && empty($_GET['success']) === true) {
        ?>
            <h3 class="email_success">Emails have been sent</h2>
            <a href="admin.php" class="email_success_a">Go back to the admin page</a>
        <?php 
        } else {
            if (empty($_POST) === false) {
                if (empty($_POST['subject']) === true) {
                    $errors[] = 'A message subject is required.';
                }
                if (empty($_POST['body']) === true) {
                    $errors[] = 'A body message is required.';
                }
                if (empty($errors) === false) {
                    echo output_errors($errors);
                } else {
                    email_users($_POST['subject'], $_POST['body']);
                    header('Location: email_users.php?success');
                    exit();
                }
            }
// generate email form otherwise

Any idea why I’m getting this error?

Fatal error: Cannot redeclare PHPMailerAutoload()

I would also like to point out that even with this error, the function still works and the emails are being sent…

EDIT: As requested, please see below the function using PHPMailer:

function email($user, $subject, $body) {
    require 'phpmailer/PHPMailerAutoload.php';
    $mail = new PHPMailer;

 /* $mail -> Host,username,password and other misc stuff
    $mail->Subject = $subject;
    $mail->Body    = $body;
    $mail->AltBody = $body; etc */
}

Fix PHP Fatal error: Cannot redeclare “function name”

This is a short guide on how to deal with the following PHP error:

Fatal error: Cannot redeclare function name (previously declared in /path/to/file.php:3) in /path/to/other-file.php on line 9

The fatal error above will appear if your code contains two or more PHP functions that have the exact same name. Unlike other programming languages such as Java and C++, PHP does not support Method Overloading. Instead, you must use default / optional function parameters.

Where was the first function defined?

If you read the error carefully, you should be able to see what the issue is. In the example above, the function name in question was already previously declared on LINE 3 in file.php. This led to a fatal error when we attempted to create another function with the exact same name on LINE 9 in other-file.php

Take a look at the following example:

If you attempt to run the code snippet above, a fatal error will be thrown and the script will be killed. This is because I created two separate functions with the name test.

OK, so how do I fix this error?

The fix depends on your PHP application and what you are attempting to achieve.

Rename the other function to something else.

If you do not need a function called test, then you could rename the second function to something else.

In the case above, we could do the following:

As you can see, I simply renamed the second test function to myTest.

Check if the function name has already been used.

If you find yourself in a situation where the function name may or may not exist, then you can check to see if the name of the function has already been defined.

An example of this approach being assigned to the problem that we had above:

In the code snippet above, I used the function_exists function to check if test already exists as a function. Because it does exist in the example above, the second function is never created.

Fatal error: Cannot redeclare Classname::function.

Note that PHP class methods / functions must also abide by the same rule:

If you run the code above, it will result in the following error:

Fatal error: Cannot redeclare Test::test() in /path/to/file.php on line 14

This is because a PHP class cannot have two functions with the exact same name. Note that I used public on the first function and protected on the second function because I wanted to demonstrate how the visibility of the method does not matter in this case.

Hopefully, you found this guide to be informative!

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Opencart 2: ошибка Fatal error: Cannot redeclare

Если после установки модуля или модификации на Opencart 2 вылазит ошибка Fatal error: Cannot redeclare . — это значит, что php-функция или php-класс, который указан в ошибке, дублируеться. Вам нужн оставить только одну функцию или класс с таким названием. Все очень просто, ищите проблемный файл (контроллер или модель, скорее всего модифицированный через vqmod или ocmod), который указан в функции, в этом файле ищите функции или класы с одинаковыми названиями и если они дублируються полностью — тогда один из них удаляете, если они разные — переименовывайте и исправляйте всю цепочку обращений к этой функции или классу.

Пример ошибки:
Fatal error: Cannot redeclare ModelCatalogProduct::editList() in /home/site/public_html/www.site.com/vqmod/vqcache/vq2-admin_model_catalog_product.php on line 164
Решение ошибки:
Нужно открыть файл vqmod/vqcache/vq2-admin_model_catalog_product.php и сделать поиск «public function editList», вы найдете две функции с таким названием. Далее нужно определить: эти функции одинаковые или разные? Затем вам нужно найти в каком модификаторе добавляеться дублирующая функция, для этого открываете папку vqmod/xml/ и ищите файл в котором добавляеться эта функция. Когда уже нашли: если функции были одинаковые — тогда удаляете эту операцию из модификатора, если разные — переименовывайте и исправляйте цепочку обращений к этой функции в модуле.

Если такая ошибка возникает в папке system/modification/ или в system/storage/modification/ — процедура та же самая, только добавление дублирующейся функции нужно искать в модификаторе модуля ( файл с расширением *.ocmod.xml или файл install.xml ), затем удалить старый модификатор в админке и установить новый отредактированный.

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php fatal error cannot redeclare class – How to fix?

by Keerthi PS | Dec 7, 2019

Receiving an error ‘PHP fatal error cannot redeclare class’? Here’s how we fix it.

A few days ago, we came across this error message due to which our customer was not able to continue with coding for a long time.

At Bobcares, we often get requests to fix PHP fatal errors, as a part of our Server Management Services.

Today, we’ll have a deep look into PHP fatal errors and see how our Support Engineers fix them.

Why does PHP fatal error occur?

We’ve seen many of our customers experiencing this error. Usually, this error causes an immediate termination of the script.

Basically, ‘PHP fatal error cannot redeclare class’ indicates that the class name already exists.

Mostly, this error shows up while the user is adding some new PHP codes. But WordPress sites also show the same error due to plugin or theme conflicts.

Let’s see both these instances in detail.

1. Error while coding

PHP fatal error is quite common while coding. Developers often get the error message when trying to declare an already existing class. The error message appears as:

At this point of error, the script terminates.

Recently, one of our customers approached us with this error. So we suggested him to avoid using already existing class in further coding.

But the new class created by our customer was also giving the same error. So, we provided him the below command to fix the problem.

Here XXXX is the new class name.

2. Cannot redeclare class error in WordPress

Sometimes, WordPress sites show fatal error cannot redeclare class.

Usually, PHP based WordPress site shows this error after installation of new plugins or themes. A typical error message in WordPress looks like:

When our customers approach us with this error message, our Support Team checks for the reason for the error.

In most cases, the error will be with the usage of the same class in function.php and plugin files. So, to fix this error we disable the plugin and install the latest version.

[Need help in fixing PHP fatal errors? – We’ll help you.]

Conclusion

In short, PHP fatal error cannot redeclare class occurs due to reuse of an already existing class name, or plugins in WordPress sites. Today, we saw how our Support Engineers fix this error for our customers.

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470 votes

2 answers

Get the solution ↓↓↓

PHP Fatal error:  Cannot redeclare PHPMailerAutoload() (previously declared in /home2/epsilonbr/ticket/PHPMailer/PHPMailerAutoload.php:24) in /home2/epsilonbr/ticket/PHPMailer/PHPMailerAutoload.php on line 24

function PHPMailerAutoload($classname)
{
    //Can't use __DIR__ as it's only in PHP 5.3+
    $filename = dirname(__FILE__).DIRECTORY_SEPARATOR.'class.'.strtolower($classname).'.php';
    if (is_readable($filename)) {
        require $filename;
    }
}

if (version_compare(PHP_VERSION, '5.1.2', '>=')) {
    //SPL autoloading was introduced in PHP 5.1.2
    if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
        spl_autoload_register('PHPMailerAutoload', true, true);
    } else {
        spl_autoload_register('PHPMailerAutoload');
    }
} else {
    /**
     * Fall back to traditional autoload for old PHP versions
     * @param string $classname The name of the class to load
     */
    function __autoload($classname)
    {
        PHPMailerAutoload($classname);
    }
}

Write your answer

255

votes

Answer

Solution:

The solution was really easy and as @CBroe said.

I had added therequire 'PHPMailer/PHPMailerAutoload.php'; twice in the code, once inside the header.php and the second time was inside the something_in_the_body.php file because I forgot that I had added that inside the header.

360

votes

Answer

Solution:

public function E_mail($name,$from,$to,$title,$message)
{
 $this->email->from($from,$name);
 $this->email->to($to);
 $this->email->subject($title);
 $this->email->message($message);
 if($this->email->send()) 
  echo "Success";
     else 
        echo "Fail";
}

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I am using PHPMailer to send emails from my local host.

I have written a function which is supposed to send emails to registered users who have chosen the option to receive them. (i.e. newsletter subscription, etc)

function email_users($subject, $body) {
    include('core/db/db_connection.php');
    $sql = "SELECT email, first_name FROM `_users` WHERE allow_email = 1";
    $query = mysqli_query($dbCon, $sql);
    while (($row = mysqli_fetch_assoc($query)) !== false) {
        $body = "Hello ". $row['first_name'] . ", <br><br>" . $body;
        email($row['email'], $subject, $body);
    }
}

The code that is calling the function:

if (isset($_GET['success']) === true && empty($_GET['success']) === true) {
        ?>
            <h3 class="email_success">Emails have been sent</h2>
            <a href="admin.php" class="email_success_a">Go back to the admin page</a>
        <?php 
        } else {
            if (empty($_POST) === false) {
                if (empty($_POST['subject']) === true) {
                    $errors[] = 'A message subject is required.';
                }
                if (empty($_POST['body']) === true) {
                    $errors[] = 'A body message is required.';
                }
                if (empty($errors) === false) {
                    echo output_errors($errors);
                } else {
                    email_users($_POST['subject'], $_POST['body']);
                    header('Location: email_users.php?success');
                    exit();
                }
            }
// generate email form otherwise

Any idea why I’m getting this error?

Fatal error: Cannot redeclare PHPMailerAutoload()

I would also like to point out that even with this error, the function still works and the emails are being sent…

EDIT: As requested, please see below the function using PHPMailer:

function email($user, $subject, $body) {
    require 'phpmailer/PHPMailerAutoload.php';
    $mail = new PHPMailer;

 /* $mail -> Host,username,password and other misc stuff
    $mail->Subject = $subject;
    $mail->Body    = $body;
    $mail->AltBody = $body; etc */
}