29 lines
1.0 KiB
PHP
29 lines
1.0 KiB
PHP
<?php
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// File name: xhtml.inc.php
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// Description: Extended PHP subroutine to read from/write to a file
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// Date: 2004-12-29
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// Author: imacat <imacat@pristine.com.tw>
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// Copyright: Copyright (C) 2004-2007 Pristine Communications
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// xhtml_content_type: Check whether application/xhtml+xml or text/html
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// should be sent to the client
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function xhtml_content_type()
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{
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// Browsers that claim to support application/xhtml+xml explicitly
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if ( array_key_exists("HTTP_ACCEPT", $_SERVER)
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&& strpos($_SERVER["HTTP_ACCEPT"], "application/xhtml+xml") !== false) {
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return "application/xhtml+xml";
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}
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// Browsers that are known to support application/xhtml+xml
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if (array_key_exists("HTTP_USER_AGENT", $_SERVER)) {
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// W3C validator can recognize application/xhtml+xml
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if (substr($_SERVER["HTTP_USER_AGENT"], 0, 13) == "W3C_Validator") {
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return "application/xhtml+xml";
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}
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}
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// Else, we assume that application/xhtml+xml is not supported
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return "text/html";
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}
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?>
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