PHP's functions rawurlencode() and urlencode(), both encode the whole argument parameter string, making the result useless as a valid link.
The function listed here encodes a link string (e.g. http://www.domain.com/long_path/to\file.php?query=param#fragm) to a valid <a href=""> parameter string, preserving the original URI structure and the path given.
function linkencode ($p_url) {
$ta = parse_url($p_url);
if (!empty($ta[scheme])) { $ta[scheme].='://'; }
if (!empty($ta[pass]) and !empty($ta[user])) {
$ta[user].=':';
$ta[pass]=rawurlencode($ta[pass]).'@';
} elseif (!empty($ta[user])) {
$ta[user].='@';
}
if (!empty($ta[port]) and !empty($ta[host])) {
$ta[host]=''.$ta[host].':';
} elseif (!empty($ta[host])) {
$ta[host]=$ta[host];
}
if (!empty($ta[path])) {
$tu='';
$tok=strtok($ta[path], "\\/");
while (strlen($tok)) {
$tu.=rawurlencode($tok).'/';
$tok=strtok("\\/");
}
$ta[path]='/'.trim($tu, '/');
}
if (!empty($ta[query])) { $ta[query]='?'.$ta[query]; }
if (!empty($ta[fragment])) { $ta[fragment]='#'.$ta[fragment]; }
return implode('', array($ta[scheme], $ta[user], $ta[pass], $ta[host], $ta[port], $ta[path], $ta[query], $ta[fragment]));
}