How to convert wav into a hex string

How to convert wav to a hexadecimal string? Can audio files suffixed with wav be converted to hexadecimal strings? Using PHP to parse png as follows: can it be converted into a hexadecimal string? I am not very familiar with wav files. thank you for your advice. how can I convert wav into a hexadecimal string?
Can audio files suffixed with wav be converted to hexadecimal strings?
Png is parsed using PHP as follows:

Can it also be converted into a hexadecimal string? I don't know much about wav files. thank you.
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Now that you can unpack the package, just package it back.