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Which function in php validate if the string is valid html?

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爱一瞬间的悲伤
爱一瞬间的悲伤 2020-12-03 16:30

Which function in php validate if the string is html? My target to take input from user and check if input html and not just string.

Example for not html string:

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  • 忘了有多久
    2020-12-03 16:47

    simplexml_load_string will fail if you don't have a single root node. So if you try this html:

    <p>A</p><p>B</p> it will be invalid.

    Here's my function:

    function check($string){
    $start = strpos($string, '<');
    $end = strrpos($string, '>', $start);

    if ($end !== false) {
        $string = substr($string, $start);
    } else {
        $string = substr($string, $start, strlen($string) - $start);
    }

    // xml requires one root node
    $string = "<div>$string</div>";

    libxml_use_internal_errors(true);
    libxml_clear_errors();
    simplexml_load_string($string);

    return count(libxml_get_errors()) == 0;
}
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  • 滥情空心
    2020-12-03 16:48

    If you want to make your site secure also, you certainly have to use an HTML purifier like htmlpurifier, tidy etc.

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  • 眼角桃花
    2020-12-03 16:52

    Are you trying to prevent users from posting html tags instead of strings? Cause if this is what you want to do you just need striptags()

    Wich will remove any html tags from the string.

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  • 名媛妹妹
    2020-12-03 16:53

    you should use:

    $html="<html><body><p>This is array.</p><br></body></html>";

libxml_use_internal_errors(true);
$dom = New DOMDocument();
$dom->loadHTML($html);
if (empty(libxml_get_errors())) {
  echo "This is a good HTML";
}else {
  echo "This not html";
}
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  • 时光说笑
    2020-12-03 16:54

    Do you mean HTML or XHTML?

    The HTML standard and interpretation are so loose that your first snippet might work. It won't be pretty but you might get something.

    XHTML is quite a bit more strict and at minimum will expect your snippet to be well-formed (all opened tags are closed; tags can nest but not overlap) and may throw warnings if you have unrecognized elements or attributes.

    Something like Tidy - http://php.net/manual/en/book.tidy.php - is probably a good start. Once you load your snippet using that, you can use tidy_error_count or tidy_get_error_buffer to see if it's "okay enough" for your needs.

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  • 孤城傲影
    2020-12-03 17:08

    You can use DomDocument's method loadHTML

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