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zhaojing2006

于 2007-01-12 11:53:00 发布

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分类专栏： PHP 文章标签： file path string url

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本文介绍了一种基于URL地址进行前后页切换的方法，通过解析URL获取当前页面信息，并实现上一页与下一页的功能。该方法虽然简单直接，但在实际应用中灵活性有限。

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//http://www.yourmom.com/dinner/tuna_1.html
$full_path=getenv("REQUEST_URI");
$root=dirname($full_path);                 // /dinner/
$page_file = basename($full_path);        // tuna_1.html
$page_num = substr($page_file , strrpos($page_file, "_") + 1 , strpos($page_file, ".html") - (strrpos($page_file, "_") + 1) );    // 1
$partial_path = substr($page_file, 0, strrpos($page_file, ".")); //   dinner/tuna_1
$prev_page_file = $partial_path . "_" . (string)($page_num-1) . ".html";
$next_page_file = $partial_path . "_" . (string)($page_num+1) . ".html";
$prev_exists = file_exists($prev_page_file);
$next_exists = file_exists($next_page_file);
if ($prev_exists) {
print "<a href=$root/$prev_page_file> previous </a>";
if ($next_exists) {
     print " | ";
}
}
if ($next_exists) {
   print "<a href=$root/$next_page_file>next</a>";
}