I have a html string of iframe where width and it's value is included. I want to replace the width's value by regex in php. For example, I am getting a value dynamically as
<iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>
I want to change the value of width by the regular expression. Can you help me someone.
Avoid using RegEx in XML/HTML documents, there are a performant libraries to do that, unless there a very very very good reason for that
Try with this code to achieve your job
<?php
$html = '<iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>';
$doc = new DOMDocument();
$doc->loadHTML($html);
$elements = $doc->getElementsByTagName('iframe');
foreach($elements as $el) {
$el->setAttribute('width', '1024');
}
print $doc->saveHTML();
OUTPUT
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><iframe width="1024" height="315" src="" frameborder="0" allowfullscreen></iframe></body></html>
sounds like a really bad idea, but here goes... something like
<?php
header('content-type:text/plain;charset=utf8');
$str=base64_decode('PGlmcmFtZSB3aWR0aD0iNTYwIiBoZWlnaHQ9IjMxNSIgc3JjPSIiIGZyYW1lYm9yZGVyPSIwIiBhbGxvd2Z1bGxzY3JlZW4+PC9pZnJhbWU+');
$ret=preg_replace('/(\<iframe.*?width\=)\"(.*?)\"/','${1}"999"',$str);
var_dump($str,$ret);
will change width to 999... but you should really use a proper HTML parser instead, like DOMDocument.
$domd=#DOMDocument::loadHTML($str);
$domd->getElementsByTagName('iframe')->item(0)->setAttribute('width',999);
echo $domd->saveHTML($domd->getElementsByTagName('iframe')->item(0));
will also change width to 999, and is much more reliable (for example, the regex will break if there is spaces or newlines between the width and = , although it would still be legal html.. sigh)
Related
I want to wrap decode all html tags from a post content in Wordpress.
like
<iframe src="https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2FRocketsAreCool%2Fvideos%2F1032994553496742%2F&show_text=0&width=560" width="560" height="315" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true" allowFullScreen="true">
When I try this code:
$query = new WP_Query(array('name'=>'example_topic'));
$post = $query->posts;
$text = htmlspecialchars_decode($post->content);
It works, but not closing the html tag because the tag was not originally closed in the encoded tags, so every thing comes after not showing in browser.
I want to remove only iframe(and everyhing inside iframe)with facebook like above but to keep youtube iframe:
<iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fwww.example.com%2F%3Fp%313098&layout=standard&show_faces=true&width=500&action=recommend&colorscheme=light" ></iframe>
To keep iframes from youtube:
<iframe width="640" height="360" src="https://www.youtube.com/embed/hiYtWYLEjlI?rel=0" frameborder="0" allowfullscreen></iframe>
I've this regex but it only remove
<\/*i(?:frame|layer)|l(?:ayer|ink)[^>]*+>
https://regex101.com/r/eM9eS3/5
Better take the xpath approach:
$xml = simplexml_load_string($your_html_string);
$iframes = $xml->xpath("//iframe[contains(#src, 'facebook.com')]");
And delete these:
for ($i=0;$i<count($iframes);$i++) {
$iframe = $iframes[$i];
unset($iframe[0][0]);
}
Your new XML looks like:
echo $xml->asXML();
As whole function:
function goAwayFacebook($html) {
$xml = simplexml_load_string($html);
$iframes = $xml->xpath("//iframe[contains(#src, 'facebook.com')]");
for ($i=0;$i<count($iframes);$i++) {
$iframe = $iframes[$i];
unset($iframe[0][0]);
}
return $xml->asXML();
}
$newhtml = goAwayFacebook($html);
So you are roughly trying to check if www.facebook.com is present in <ifram> or not. This can be achieved by using following regex.
Regex: (?=.*www\.facebook\.com.*)<iframe .*<\/iframe>
Explanation:
(?=.*www\.facebook\.com.*) checks for presence of www.facebook.com between the <iframe> tags.
Regex101 Demo
hi i was working on a scraper but i am unable to get one of information.
this is the link http://sfglobe.com/?id=19110
div class="video_container">
<div class="video_object">
<iframe id="player" width="100%" height="100%" frameborder="0" allowfullscreen="1" title="YouTube video player"
src="http://www.youtube.com/embed/KMYrIi_Mt8A?enablejsapi=1&controls=1&showinfo=0& color=white&rel=0&wmode=transparent&modestbranding=1&theme=light&autohide=1&start=4& origin=http%3A%2F%2Fsfglobe.com">
<!DOCTYPE html>
<html lang="en" data-cast-api-enabled="true" dir="ltr"
i need src ="http://www.youtube.com/embed/KMYrIi_Mt8A....."
i this is my code which does not work
foreach ($html->find('.video_object')as $iframe){
echo "this is video ".$iframe->outertext ." <br>";
}
thank you very uc
Do this return anything on your code?
$html->find('.video_object iframe')
If so, try using ->getAttribute('src'); it might work.
For further information take a look at PHP DOMElement
EDIT
Use XPath instead, it will output the expected result
//init DOMDocument
$dom = new DOMDocument();
//get the source from the URL
$html = file_get_contents("URL");
//load the html from html string
$dom->loadHTML($html);
//init XPath
$xpath = new DOMXPath($dom);
//fetch the src from the iframe within
$iframe_src=$xpath->query('//*[#class="CLASSNAME"]/iframe//#src');
vardump($iframe_src);
I have the following data in mysql database which is an iframe from u-tube:-
`<iframe width="560" height="315" src="http://www.youtube.com/embed/Om2fabTIKE4" frameborder="0" allowfullscreen></iframe>`
Nevertheless, in the php codes, a present phase is present for the above iframe, in which I just need Om2fabTIKE4 as the variable to be filled in.
I would like to ask, is there any way that I can trim away
<iframe width="560" height="315" src="http://www.youtube.com/embed/
and
frameborder="0" allowfullscreen></iframe>
Try this:
$html = '<iframe width="560" height="315" src="http://www.youtube.com/embed/Om2fabTIKE4" frameborder="0" allowfullscreen></iframe>';
$dom = new DOMDocument();
$dom->loadHTML($html);
$tags = $dom->getElementsByTagName('iframe');
foreach ($tags as $tag)
$link = explode('/',parse_url($tag->getAttribute('src'),PHP_URL_PATH));
var_dump($link[2]);
You can learn more about the DOMDocument class here.
Use str_replace to remove the text
I have some text with images within it. I want to replace specific images within the text with something else.
i.e. the text contains an a youtube img url that I want to replace with the actual video link.
<img class="mceItem" src="http://img.youtube.com/vi/1MsVzAkmds0/default.jpg" alt="1MsVzAkmds0">
and replace it with the youtube Iframe code:
<iframe title="'.$id.'" class="youtube-player" type="text/html" width="576" height="400" src="http://www.youtube.com/embed/'.$id.'" frameborder="0"></iframe>
my function looks like this:
function replacelink($link) {
$find= ("/<img src=[^>]+\>/i");
$replace = youtube("\\2");
return preg_replace($find,$replace);
}
What do I need to change in the regex to do the above?
Your regex is looking for <img src=, but there is a class attribute between img and src. Using $find= '/<img.*src=[^>]+>/i'; corrects the problem; however, this illustrates why you shouldn’t use regex to parse HTML.
You wrote:
I have some text with images within it.
If the text you’re referring to is actually HTML, then there are better alternatives to using regex for this.
Update
I believe this is what you’re looking for.
<?php
function replacelink($text) {
$replace = '<iframe title="$2" class="youtube-player" type="text/html" width="576" height="400" <iframe title="$2" class="youtube-player" type="text/html" width="576" height="400" src="http://www.youtube.com/embed/$2" frameborder="0"></iframe>';
$find = '/(<img.*?alt="([\da-z]+)".*?>)/i';
return preg_replace($find, $replace, $text);
}
$imagestr = '<img class="mceItem" src="http://img.youtube.com/vi/1MsVzAkmds0/default.jpg" alt="1MsVzAkmds0">';
echo replacelink($imagestr);
?>
There’s no need for a separate youtube() function.
If you want to replace more than one image, use preg_replace_all() instead of preg_replace().
The following regex would get all the images with a specific url. I not sure if this is what you wanted.
<img [^>]*?src="url"[^>]*?>
Previous anwser would fail if there were more than one image.