get parameters from <a> tag

[pedroz]

How can i get all parameters from an <a> tag?

need to have the following result
$content = 'class="idz" href="http://www.domain1.com"';

$content = 'asdasd <a class="idz" href="http://www.domain1.com">View this</a> hhh ';

$pattern = '/#<a(.*)>View this</a>#ims/'; 
$content = preg_replace($pattern, '$1', $content);

var_dump(content);

[vicodin]

I dont think a Preg_Match is gonna get you what you want in all cases... I found this on the web, you should be able to manipulate this to get what you want.

    function strip_attributes($msg, $tag, $attr, $suffix = “”)

{

$lengthfirst = 0;

while (strstr(substr($msg, $lengthfirst), “<$tag “) != “”) {

$tag_start = $lengthfirst + strpos(substr($msg, $lengthfirst), “<$tag “);

$partafterwith = substr($msg, $tag_start);

$img = substr($partafterwith, 0, strpos($partafterwith, “>”) + 1);

$img = str_replace(” =”, “=”, $img);

$out = “<$tag”;

for($i = 0; $i < count($attr); $i++) {

if (empty($attr[$i])) {

continue;

}

$long_val =

(strpos($img, ” “, strpos($img, $attr[$i] . “=”)) === false) ?

strpos($img, “>”, strpos($img, $attr[$i] . “=”)) – (strpos($img, $attr[$i] . “=”) + strlen($attr[$i]) + 1) :

strpos($img, ” “, strpos($img, $attr[$i] . “=”)) – (strpos($img, $attr[$i] . “=”) + strlen($attr[$i]) + 1);

$val = substr($img, strpos($img, $attr[$i] . “=”) + strlen($attr[$i]) + 1, $long_val);

if (!empty($val)) {

$out .= ” ” . $attr[$i] . “=” . $val;

}

}

if (!empty($suffix)) {

$out .= ” ” . $suffix;

}

$out .= “>”;

$partafter = substr($partafterwith, strpos($partafterwith, “>”) + 1);

$msg = substr($msg, 0, $tag_start) . $out . $partafter;

$lengthfirst = $tag_start + 3;

}

return $msg;

}

The function takes 4 parameters.

1 $msg. The text you want to strip attributes from.
2 $tag. The tag you want to strip attributes fom (p, for instancee).
3 $attr. An array with the name of the attributes you want to strip (leaving the rest intact). If the array is empty, the function will strip all attributes.

4 $suffix. An optional text to append to the tag. It may be a new attribute, for instance.

[johanafm]

I'd recommend using a whitelist for attributes to preserve, rather than a blacklist of things to strip. That is, something not explicitly specified will be removed.

Also, the simples approach is using DOM in my opinion. Easy to specify what you want to allow, easy to retrieve what values you want and easy to target one or several elements getting them by tag name, class name, id etc.

# only attributes listed here will be preserved.
$okattrs = array(
				'a' => array('href' => true),
				'div' => array(...)
			);

$dom = new DOMDocument();
$dom->loadHTML(...);

# somehow get the specific element, or perhaps all such elements

$els = $dom->getElementsByTagName('a');
foreach ($els as $el)
{
	# $el_attrs will contain all attributes the element initially had
	# Not sure if this is what you want or not, but it's easy to modify
	# what you stick in there...
	$el_attrs = array();
	foreach ($el->attributes as $name => $attrNode)
	{
		if (!isset($okattrs[$el->nodeName][$name]))
			$el->removeAttribute($name);
		$el_attrs[$name] = $attrNode->value;
	}
	printf('This node had attributes:<pre>%s</pre>', print_r($el_attrs,1));
}