I hope a great God can help my little brother. I write a PHP source code

I hope a great God can help me write a PHP source code
I hope there is a great God to help me write a PHP applet code.
The specific function is, I want to use a barcode scanner to scan the return of the generated barcode, the system will automatically open the return Request form page after reading the barcode.
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Scanning guns can scan barcodes, just like input,
The code is done with the onchange event.
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It depends on what kind of interface the scanner has. There is not necessarily PHP, it is possible to provide only other.

Read the interface documentation.
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Actually is an input box enter the event, with JS processing a request PHP back end is OK

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