你怎么能用php隐藏html元素？

Question

if you do in php:

$dom = new DOMDocument();
$dom->loadHTML($pageUrl);
$dom->getElementById(eleId);

How can you hide the element. I know how you can do it with css and js. But I want to know it with php.

Answer 1

I'm going to assume that you're trying to have the element initially hidden ie in existence, but not visible, upon the browser's initial rendering and you already know that PHP can't directly instruct the browser to hide elements.

Following your example, you could do:

$eleId = “div_to_hide”;
$dom = new DOMDocument();
$dom->loadHTML($pageUrl);
$target_elem = $dom->getElementById($eleId);
if ($target_elem) {
    $target_elem-> setAttribute('style','display: none;');
}

Or you could create a “script” element containing JavaScript code to execute after the resource has totally downloaded to hide it at run-time.

Or you could create a “style” element in your DOMDocument object in which you'd put CSS content referencing the target element (by selector) to apply initial “display: none;” CSS.

Just other ideas, but the snippet above follows your paradigm.