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What are common issues encountered when trying to display a message box in PHP after a successful database entry?

When trying to display a message box in PHP after a successful database entry, a common issue is that the message may not be visible due to immediate redirection or page reloading. To solve this, you can store the message in a session variable before redirecting to another page and then display the message on the redirected page.

php 
// After successful database entry
$_SESSION['message'] = "Database entry successful!";
header("Location: redirected_page.php");
exit();
```

On the redirected_page.php, you can display the message using the following code:

```php
session_start();
if(isset($_SESSION['message'])){
    echo '<script>alert("'.$_SESSION['message'].'")</script>';
    unset($_SESSION['message']);
}

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