How can the PHP code in the content.php file be modified to prevent the error message "Notice: Undefined index: delete" in the success.php file?

The issue is caused by accessing an index in an array that does not exist. To prevent the error message "Notice: Undefined index: delete" in the success.php file, you can check if the index exists before trying to access it. This can be done using the isset() function in PHP. 

```php
// content.php
if(isset($_POST['delete'])) {
    // code to handle delete action
}
```

By using isset() to check if the 'delete' index exists in the $_POST array before accessing it, you can prevent the "Undefined index" notice from appearing in the success.php file.

Keywords

PHP error handling undefined index isset array key exists

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