How can the automatic submission of a form be prevented when using a barcode scanner in PHP?

Issue: When using a barcode scanner in PHP to input data into a form, the form may be automatically submitted without the user's intention. This can be prevented by disabling the form submission on barcode input and only allowing manual submission by the user. 

```php
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['barcode_input'])){
    // Process the barcode input
    // Disable automatic form submission
    echo "<script>document.getElementById('form_id').onsubmit = function() { return false; }</script>";
}
?>
```

Replace 'form_id' with the actual ID of the form in your HTML code. This code snippet will prevent the form from being automatically submitted when a barcode is scanned.

Keywords

barcode scanner form submission prevent PHP event.preventDefault()

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