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I'm trying to use regex to replace source attribute (could be image or any tag) in PHP.
I've a string like this:
$string2 = "<html><body><img src = 'images/test.jpg' /><img src = 'http://test.com/images/test3.jpg'/><video controls="controls" src='../videos/movie.ogg'></video></body></html>";
And I would like to turn it into:
$string2 = "<html><body><img src = 'test.jpg' /><img src = 'test3.jpg'/><video controls="controls" src='movie.ogg'></video></body></html>";
Heres what I tried :
$string2 = preg_replace("/src=["']([/])(.*)?["'] /", "'src=' . convert_url('$1') . ')'" , $string2);
echo htmlentities ($string2);
Basically it didn't change anything and gave me a warning about unescaped string.
Doesn't $1 send the content of the string ? What is wrong here ?
And the function of convert_url is from an example I posted here before :
function convert_url($url)
{
if (preg_match('#^https?://#', $url)) {
$url = parse_url($url, PHP_URL_PATH);
}
return basename($url);
}
It's supposed to strip out url paths and just return the filename.
854
Don't use regular expressions on HTML - use the DOMDocument class.
$html = "<html>
<body>
<img src='images/test.jpg' />
<img src='http://test.com/images/test3.jpg'/>
<video controls='controls' src='../videos/movie.ogg'></video>
</body>
</html>";
$dom = new DOMDocument;
libxml_use_internal_errors(true);
$dom->loadHTML( $html );
$xpath = new DOMXPath( $dom );
libxml_clear_errors();
$doc = $dom->getElementsByTagName("html")->item(0);
$src = $xpath->query(".//@src");
foreach ( $src as $s ) {
$s->nodeValue = array_pop( explode( "/", $s->nodeValue ) );
}
$output = $dom->saveXML( $doc );
echo $output;
Which outputs the following:
<html>
<body>
<img src="test.jpg">
<img src="test3.jpg">
<video controls="controls" src="movie.ogg"></video>
</body>
</html>
You have to use the e modifier.
$string = "<html><body><img src='images/test.jpg' /><img src='http://test.com/images/test3.jpg'/><video controls=\"controls\" src='../videos/movie.ogg'></video></body></html>";
$string2 = preg_replace("~src=[']([^']+)[']~e", '"src=\'" . convert_url("$1") . "\'"', $string);
Note that when using the e modifier, the replacement script fragment needs to be a string to prevent it from being interpreted before the call to preg_replace.
33
function replace_img_src($img_tag) {
$doc = new DOMDocument();
$doc->loadHTML($img_tag);
$tags = $doc->getElementsByTagName('img');
foreach ($tags as $tag) {
$old_src = $tag->getAttribute('src');
$new_src_url = 'website.com/assets/'.$old_src;
$tag->setAttribute('src', $new_src_url);
}
return $doc->saveHTML();
}
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