上周，我要求我的读者创建一个 PHP 脚本，该脚本在 HTML 文档中查找锚点，并在元素还没有 ID 时为该元素分配一个 ID。杰里米·帕里什 (Jeremy Parrish) 直面挑战。
PHP
function anchor_fix($anchor)
{
// the match comes as an array
// the whole match (what we want) is the 0th element
if (! preg_match('/\sid="/i', $anchor[0])) {
return preg_replace('/name="([^"]*)"/i', 'id="$1" $0', $anchor[0]);
} else {
// already has an id!
return $anchor[0];
}
}
/* usage */
echo preg_replace_callback('/<a[^>]*>/i', 'anchor_fix', file_get_contents('page.html'));
结果
<body> <b> <a name="stuff">this is an anchor</a> some text... <a name="another">another one...</a> </b> <div><a id="thing" name="other">another thing</a> </div> </body>
……变成……
<body> <b> <a id="stuff" name="stuff">this is an anchor</a> some text... <a id="another" name="another">another one...</a> </b> <div><a id="thing" name="other">another thing</a> </div> </body>
干得好杰里米！
