141 lines
3.3 KiB
PHP
141 lines
3.3 KiB
PHP
<?php
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/*
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A spiritual port of Python's urlparse.urljoin() function to PHP. Why this isn't in the standard library is anyone's guess.
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Author: fluffy, http://beesbuzz.biz/
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Latest version at: https://github.com/plaidfluff/php-urljoin
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*/
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function urljoin($base, $rel) {
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if (!$base) {
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return $rel;
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}
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if (!$rel) {
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return $base;
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}
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$uses_relative = array('', 'ftp', 'http', 'gopher', 'nntp', 'imap',
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'wais', 'file', 'https', 'shttp', 'mms',
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'prospero', 'rtsp', 'rtspu', 'sftp',
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'svn', 'svn+ssh', 'ws', 'wss');
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$pbase = parse_url($base);
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$prel = parse_url($rel);
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if ($prel === false || preg_match('/^[a-z0-9\-.]*[^a-z0-9\-.:][a-z0-9\-.]*:/i', $rel)) {
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/*
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Either parse_url couldn't parse this, or the original URL
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fragment had an invalid scheme character before the first :,
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which can confuse parse_url
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*/
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$prel = array('path' => $rel);
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}
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if (array_key_exists('path', $pbase) && $pbase['path'] === '/') {
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unset($pbase['path']);
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}
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if (isset($prel['scheme'])) {
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if ($prel['scheme'] != $pbase['scheme'] || in_array($prel['scheme'], $uses_relative) == false) {
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return $rel;
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}
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}
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$merged = array_merge($pbase, $prel);
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// Handle relative paths:
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// 'path/to/file.ext'
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// './path/to/file.ext'
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if (array_key_exists('path', $prel) && substr($prel['path'], 0, 1) != '/') {
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// Normalize: './path/to/file.ext' => 'path/to/file.ext'
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if (substr($prel['path'], 0, 2) === './') {
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$prel['path'] = substr($prel['path'], 2);
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}
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if (array_key_exists('path', $pbase)) {
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$dir = preg_replace('@/[^/]*$@', '', $pbase['path']);
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$merged['path'] = $dir . '/' . $prel['path'];
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} else {
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$merged['path'] = '/' . $prel['path'];
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}
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}
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if(array_key_exists('path', $merged)) {
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// Get the path components, and remove the initial empty one
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$pathParts = explode('/', $merged['path']);
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array_shift($pathParts);
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$path = [];
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$prevPart = '';
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foreach ($pathParts as $part) {
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if ($part == '..' && count($path) > 0) {
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// Cancel out the parent directory (if there's a parent to cancel)
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$parent = array_pop($path);
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// But if it was also a parent directory, leave it in
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if ($parent == '..') {
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array_push($path, $parent);
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array_push($path, $part);
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}
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} else if ($prevPart != '' || ($part != '.' && $part != '')) {
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// Don't include empty or current-directory components
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if ($part == '.') {
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$part = '';
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}
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array_push($path, $part);
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}
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$prevPart = $part;
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}
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$merged['path'] = '/' . implode('/', $path);
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}
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$ret = '';
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if (isset($merged['scheme'])) {
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$ret .= $merged['scheme'] . ':';
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}
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if (isset($merged['scheme']) || isset($merged['host'])) {
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$ret .= '//';
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}
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if (isset($prel['host'])) {
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$hostSource = $prel;
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} else {
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$hostSource = $pbase;
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}
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// username, password, and port are associated with the hostname, not merged
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if (isset($hostSource['host'])) {
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if (isset($hostSource['user'])) {
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$ret .= $hostSource['user'];
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if (isset($hostSource['pass'])) {
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$ret .= ':' . $hostSource['pass'];
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}
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$ret .= '@';
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}
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$ret .= $hostSource['host'];
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if (isset($hostSource['port'])) {
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$ret .= ':' . $hostSource['port'];
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}
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}
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if (isset($merged['path'])) {
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$ret .= $merged['path'];
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}
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if (isset($prel['query'])) {
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$ret .= '?' . $prel['query'];
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}
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if (isset($prel['fragment'])) {
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$ret .= '#' . $prel['fragment'];
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}
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return $ret;
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}
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