保证include文件中的路径总是可用

这个是让人头疼的问题，我的解决办法是：使用绝对路径，并用 $MAIN_PATH 和 $Con_MAINPATH 两个变量保持其可移植性。
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比如：
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<?
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$Con_MAINPATH="http://lastleaf.51.net/cgi-bin";
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$MAINPATH="/home/myweb/cgi-bin"
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#include "$MAINPATH/php/showphp.php"; //调用别的文件。
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//如果showphp.php中还要调用别的文件，
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//则写成 "url=$Con_MAINPATH/php/title.gif" 。
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?>
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注意区分url和文件路径，比如:
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$fp=fopen("$MAINPATH/files/a.htm","r");
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echo "<a herf=$Con_MAINPATH/files/a.htm>Click here</a>";
非常全面的一个php技术网站,php爱好者站 http://www.phpfans.net 有相当丰富的文章和源代码.