preg_replace function to append a string to all the hyperlinks of a page
i want to append my own开发者_JAVA技巧 value to all hyperlinks in a page... e.g if there are links:
<a href="abc.htm?val=1">abc 1</a> <br/>
<a href="abc.htm?val=2">abc 1</a> <br/>
<a href="abc.htm?val=3">abc 1</a> <br/>
<a href="abc.htm?val=4">abc 1</a> <br/>
I want to add next var like "type=int" to all hyperlinks
output should be:
<a href="abc.htm?val=1&type=int">abc 1</a> <br/>
<a href="abc.htm?val=2&type=int">abc 1</a> <br/>
<a href="abc.htm?val=3&type=int">abc 1</a> <br/>
<a href="abc.htm?val=4&type=int">abc 1</a> <br/>
I hope it can be done quite easily with preg_replace function
If it's a matter of just appending the variable to the href
attribute, then this would work:
# v-- & instead of & for W3C validation
preg_replace('/(<a\\s+[^>]+href="[^"]*)(")/', '${1}&type=int$2', $page_src);
But if you are wanting code-hardiness, in that href="index.php"
gets changed into href="index.php?type=int"
and not href="index.php&type=int"
, then you'll need some extra checking:
function process_link_matches ($matches) {
# get rid of full matching string; all parts are already covered
array_shift($matches);
if (preg_match('/\\?[^"]/', $matches[2])) {
# link already contains $_GET parameters
$matches[1] .= '&type=int';
} else {
# starting a new list of parameters
$matches[1] .= '?type=int';
}
return implode($matches);
}
$page_src = preg_replace_callback('/(<a\\s+[^>]+href=")([^"]*)("[^>]*>)/',
'process_link_matches', $page_src);
You can use the output buffer and output_add_rewrite_var
to do that. You might need to adjust url_rewriter.tags to only rewrite the href
attributes of a
elements.
You can use
preg_replace('/(\<a [^>]*href=")([^"]*)"/i', '&\1\2type=int"', page);
Be warned, though, that this is likely to break on arbitrary html files. I'd recommend using Regex for HTML manipulation only as a one shot operation. If you need to do this more often, or on a lot of files, consider using a HTML parser.
i'm not a regexp-expert, but this sounds like you should think of using sessions or cookies...
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