Hello World!` becomes `Hello World!`).
* @return object A simplehtmldom object of the remaining contents.
*
* @todo Check if this implementation is still necessary, because simplehtmldom
* already removes some of the tags (search for `remove_noise` in simple_html_dom.php).
*/
function sanitize(
$html,
$tags_to_remove = ['script', 'iframe', 'input', 'form'],
$attributes_to_keep = ['title', 'href', 'src'],
$text_to_keep = []
) {
$htmlContent = str_get_html($html);
foreach ($htmlContent->find('*') as $element) {
if (in_array($element->tag, $text_to_keep)) {
$element->outertext = $element->plaintext;
} elseif (in_array($element->tag, $tags_to_remove)) {
$element->outertext = '';
} else {
foreach ($element->getAllAttributes() as $attributeName => $attribute) {
if (!in_array($attributeName, $attributes_to_keep)) {
$element->removeAttribute($attributeName);
}
}
}
}
return $htmlContent;
}
/**
* Replace background by image
*
* Replaces tags with styles of `backgroud-image` by `![]()
` tags.
*
* For example:
*
* ```HTML
*
*
* Hello world!
*
*
* ```
*
* results in this output:
*
* ```HTML
*
* 
*
* ```
*
* @param string $htmlContent The HTML content
* @return string The HTML content with all ocurrences replaced
*/
function backgroundToImg($htmlContent)
{
$regex = '/background-image[ ]{0,}:[ ]{0,}url\([\'"]{0,}(.*?)[\'"]{0,}\)/';
$htmlContent = str_get_html($htmlContent);
foreach ($htmlContent->find('*') as $element) {
if (preg_match($regex, $element->style, $matches) > 0) {
$element->outertext = '
';
}
}
return $htmlContent;
}
/**
* Convert relative links in HTML into absolute links
*
* This function is based on `php-urljoin`.
*
* @link https://github.com/plaidfluff/php-urljoin php-urljoin
*
* @param string|object $content The HTML content. Supports HTML objects or string objects
* @param string $server Fully qualified URL to the page containing relative links
* @return object Content with fixed URLs.
*/
function defaultLinkTo($content, $server)
{
$string_convert = false;
if (is_string($content)) {
$string_convert = true;
$content = str_get_html($content);
}
foreach ($content->find('img') as $image) {
$image->src = urljoin($server, $image->src);
}
foreach ($content->find('a') as $anchor) {
$anchor->href = urljoin($server, $anchor->href);
}
if ($string_convert) {
$content = $content->outertext;
}
return $content;
}
/**
* Extract the first part of a string matching the specified start and end delimiters
*
* @param string $string Input string, e.g. `Post author: John Doe
`
* @param string $start Start delimiter, e.g. `author: `
* @param string $end End delimiter, e.g. `<`
* @return string|bool Extracted string, e.g. `John Doe`, or false if the
* delimiters were not found.
*/
function extractFromDelimiters($string, $start, $end)
{
if (strpos($string, $start) !== false) {
$section_retrieved = substr($string, strpos($string, $start) + strlen($start));
$section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
return $section_retrieved;
} return false;
}
/**
* Remove one or more part(s) of a string using a start and end delmiters
*
* @param string $string Input string, e.g. `foobar`
* @param string $start Start delimiter, e.g. ``
* @return string Cleaned string, e.g. `foobar`
*/
function stripWithDelimiters($string, $start, $end)
{
while (strpos($string, $start) !== false) {
$section_to_remove = substr($string, strpos($string, $start));
$section_to_remove = substr($section_to_remove, 0, strpos($section_to_remove, $end) + strlen($end));
$string = str_replace($section_to_remove, '', $string);
}
return $string;
}
/**
* Remove HTML sections containing one or more sections using the same HTML tag
*
* @param string $string Input string, e.g. `foobar`
* @param string $tag_name Name of the HTML tag, e.g. `div`
* @param string $tag_start Start of the HTML tag to remove, e.g. ``
* @return string Cleaned String, e.g. `foobar`
*
* @todo This function needs more documentation to make it maintainable.
*/
function stripRecursiveHTMLSection($string, $tag_name, $tag_start)
{
$open_tag = '<' . $tag_name;
$close_tag = '';
$close_tag_length = strlen($close_tag);
if (strpos($tag_start, $open_tag) === 0) {
while (strpos($string, $tag_start) !== false) {
$max_recursion = 100;
$section_to_remove = null;
$section_start = strpos($string, $tag_start);
$search_offset = $section_start;
do {
$max_recursion--;
$section_end = strpos($string, $close_tag, $search_offset);
$search_offset = $section_end + $close_tag_length;
$section_to_remove = substr($string, $section_start, $section_end - $section_start + $close_tag_length);
$open_tag_count = substr_count($section_to_remove, $open_tag);
$close_tag_count = substr_count($section_to_remove, $close_tag);
} while ($open_tag_count > $close_tag_count && $max_recursion > 0);
$string = str_replace($section_to_remove, '', $string);
}
}
return $string;
}
/**
* Convert Markdown into HTML with Parsedown.
*
* @link https://parsedown.org/ Parsedown
*
* @param string $string Input string in Markdown format
* @return string output string in HTML format
*/
function markdownToHtml($string)
{
$Parsedown = new Parsedown();
return $Parsedown->text($string);
}