问题
I'm trying to insert an HTML <base> tag immediately after the opening <head> tag of a page using dom. I've tried using appendChild which just inserts it before the </head> which is no good.
Code im using:
$head = $dom->getElementsByTagName('head')->item(0);
$base = $dom->createElement('base');
$base->setAttribute('href', $url);
$head->parentNode->insertBefore($base, $head);
This inserts the <base> tag before the <head>, which is still no good!
Any ideas? Beer for the correct answer!
回答1:
$head = $dom->getElementsByTagName('head')->item(0);
$base = $dom->createElement('base');
$base->setAttribute('href',$url);
if ($head->hasChildNodes()) {
$head->insertBefore($base,$head->firstChild);
} else {
$head->appendChild($base);
}
If the <head> element already has children, it inserts the <base> element before <head>'s first child. If <head> has no children, it just appends it to <head>.
来源：https://stackoverflow.com/questions/3180113/insert-created-element-at-start-of-html-tag-using-php-dom