Why does sapi_windows_cp_get return unexpected character set values on some Windows systems?

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<p><h1>Why does sapi_windows_cp_get return unexpected character set values on some Windows systems?</h1></p>
<p data-is-last-node="" data-is-only-node=""><p>In the Windows environment of PHP, the function <code>sapi_windows_cp_get<span>()