ereg_replace Help

[tobeyt23]

I what to replace/append a href link with target='_blank' within a string. I am have trouble getting this to work:

 

<?php
$text = '<p>This needs to work: <a href="http://www.cnn.com">This is a link</a></p>';

$text = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]", "<a href=\"\\0\" target=\"_blank\">\\0</a>", $text);

echo $text;

?> 

[effigy]

<pre>
<?php
function change_target($match) {
	$a_tag = $match[0];
	if (strpos($a_tag, 'target') == FALSE) {
		return preg_replace('/(?=>)/', ' target="_blank"', $a_tag);
	} else {
		return preg_replace('/(?<=target=)(["\'])?(?(1).+?\1|\S+)/', '"_blank"', $a_tag);
	}
}
$text = '<p>This needs to work: <a href="http://www.cnn.com">This is a link</a></p>';
echo preg_replace_callback('/<a[^>]+>/', 'change_target', $text);
$text = '<p>This needs to work: <a target=somewhere_else href="http://www.cnn.com">This is a link</a></p>';
echo preg_replace_callback('/<a[^>]+>/', 'change_target', $text);

?>
</pre>

[tobeyt23]

Sweet that is exactly what I needed!

[effigy]

On second thought...

if (strpos($a_tag, 'target') == FALSE) {

...should be...

if (strpos($a_tag, ' target=') == FALSE) {

...just in case the URL has the word "target" in it.

[tobeyt23]

How would i do this to check if http:// is added to the link?

[effigy]

Are you trying to add it if it's not there?

 

<pre>
<?php
function change_target($match) {
	$a_tag = $match[0];
	if (strpos($a_tag, 'target') == FALSE) {
		$a_tag = preg_replace('/(?=>)/', ' target="_blank"', $a_tag);
	} else {
		$a_tag = preg_replace('/(?<=target=)(["\'])?(?(1).+?\1|\S+)/', '"_blank"', $a_tag);
	}
	### Add http:// if it's missing.
	return preg_replace('#(?<=href=)(?(?=["\'])(["\']))(?!http://)#', '\1http://', $a_tag);
}
$text = '<p>This needs to work: <a href="www.cnn.com">This is a link</a></p>';
echo preg_replace_callback('/<a[^>]+>/', 'change_target', $text);
$text = '<p>This needs to work: <a target=somewhere_else href="http://www.cnn.com">This is a link</a></p>';
echo preg_replace_callback('/<a[^>]+>/', 'change_target', $text);

?>
</pre>