note 85388 deleted from function.realpath by peehaa
| From: | peehaa@php.net | Date: | Sun, 28 Apr 2019 09:48:23 +0000 |
| Subject: | note 85388 deleted from function.realpath by peehaa | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-210709@lists.php.net to get a copy of this message | ||
Note Submitter: Isaac Z. Schlueter i at foohack dot com
----
If you need to resolve a url against a base url, as the browser does with anchor tags, then realpath
won't help, because it's not on your file system.
This function does that:
<?php
function resolve_href ($base, $href) {
// href="" ==> current url.
if (!$href) {
return $base;
}
// href="http://..." ==> href isn't relative
$rel_parsed = parse_url($href);
if (array_key_exists('scheme', $rel_parsed)) {
return $href;
}
// add an extra character so that, if it ends in a /, we don't lose the last piece.
$base_parsed = parse_url("$base ");
// if it's just server.com and no path, then put a / there.
if (!array_key_exists('path', $base_parsed)) {
$base_parsed = parse_url("$base/ ");
}
// href="/ ==> throw away current path.
if ($href{0} === "/") {
$path = $href;
} else {
$path = dirname($base_parsed['path']) . "/$href";
}
// bla/./bloo ==> bla/bloo
$path = preg_replace('~/\./~', '/', $path);
// resolve /../
// loop through all the parts, popping whenever there's a .., pushing otherwise.
$parts = array();
foreach (
explode('/', preg_replace('~/+~', '/', $path)) as $part
) if ($part === "..") {
array_pop($parts);
} elseif ($part!="") {
$parts[] = $part;
}
return (
(array_key_exists('scheme', $base_parsed)) ?
$base_parsed['scheme'] . '://' . $base_parsed['host'] :
""
) . "/" . implode("/", $parts);
}
?>
[EDIT BY danbrown AT php DOT net: Code contains a bugfix supplied by (Zhenya DOT Morozov AT gmail
DOT com) on 23-JAN-09, to address the following issue:
'If your path contains "0" (or any "false" string) directory name, the
function removes that directory from the path.']