blocks|key|849322|text|function+rel2abs($rel,+$base)
{
++++/*+return+if+already+absolute+URL+*/
++++if+(parse_url($rel,+PHP_URL_SCHEME)+!=+'')+return+$rel;

++++/*+queries+and+anchors+*/
++++if+($rel[0]=='#'+%7C%7C+$rel[0]=='?')+return+$base.$rel;

++++/*+parse+base+URL+and+convert+to+local+variables:
+++++++$scheme,+$host,+$path+*/
++++extract(parse_url($base));

++++/*+remove+non-directory+element+from+path+*/
++++$path+=+preg_replace('#/[%5E/]*$#',+'',+$path);

++++/*+destroy+path+if+relative+url+points+to+root+*/
++++if+($rel[0]+==+'/')+$path+=+'';

++++/*+dirty+absolute+URL+*/
++++$abs+=+"$host$path/$rel";

++++/*+replace+'//'+or+'/./'+or+'/foo/../'+with+'/'+*/
++++$re+=+array('#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#');
++++for($n=1;+$n>0;+$abs=preg_replace($re,+'/',+$abs,+-1,+$n))+{}

++++/*+absolute+URL+is+ready!+*/
++++return+$scheme.'://'.$abs;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|849323|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function rel2abs($rel, $base)
{
 /* return if already absolute URL */
 if (parse_url($rel, PHP_URL_SCHEME) != '') return $rel;

 /* queries and anchors */
 if ($rel[0]=='#' || $rel[0]=='?') return $base.$rel;

 /* parse base URL and convert to local variables:
 $scheme, $host, $path */
 extract(parse_url($base));

 /* remove non-directory element from path */
 $path = preg_replace('#/[^/]*$#', '', $path);

 /* destroy path if relative url points to root */
 if ($rel[0] == '/') $path = '';

 /* dirty absolute URL */
 $abs = "$host$path/$rel";

 /* replace '//' or '/./' or '/foo/../' with '/' */
 $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
 for($n=1; $n&gt;0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

 /* absolute URL is ready! */
 return $scheme.'://'.$abs;
}
</code></pre>

blocks|key|1063722|text|实际上不是关于转换路径而不是url的问题吗？PHP实际上有一个这样的函数：realpath()。你唯一需要注意的就是符号链接。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1063723|PHP手册中的示例：|1063724|chdir('/var/www/');
echo+realpath('./../../etc/passwd')+.+PHP_EOL;
//+Prints:+/etc/passwd

echo+realpath('/tmp/')+.+PHP_EOL;
//+Prints:+/tmp|code-block|syntax|javascript|1063725|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.realpath.php^0|11|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Wasn't in fact the question about converting path and not url? PHP actually has a function for this: <a href="http://www.php.net/manual/en/function.realpath.php" rel="nofollow">realpath()</a>. The only thing you should be aware of are symlinks.

Example from PHP manual:

<pre><code>chdir('/var/www/');
echo realpath('./../../etc/passwd') . PHP_EOL;
// Prints: /etc/passwd

echo realpath('/tmp/') . PHP_EOL;
// Prints: /tmp
</code></pre>

blocks|key|1063766|text|如果相对目录已经存在，这将完成以下工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063767|function+rel2abs($relPath,+$baseDir+=+'./')
{+
if+(''+==+trim($path))
{
++++return+$baseDir;
++++}
++++$currentDir+=+getcwd();
++++chdir($baseDir);
++++$path+=+realpath($path);
++++chdir($currentDir);
++++return+$path;
}|code-block|syntax|javascript|1063768|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If the relative directory already exists this will do the job:

<pre><code>function rel2abs($relPath, $baseDir = './')
{ 
if ('' == trim($path))
{
 return $baseDir;
 }
 $currentDir = getcwd();
 chdir($baseDir);
 $path = realpath($path);
 chdir($currentDir);
 return $path;
}
</code></pre>

blocks|key|849491|text|我使用了与：http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL相同的代码，但我对它做了一些修改，所以如果基本url包含端口号，它将返回包含端口号的相对URL。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|849492|function+rel2abs($rel,+$base)
{
++++/*+return+if+already+absolute+URL+*/
++++if+(parse_url($rel,+PHP_URL_SCHEME)+!=+'')+return+$rel;

++++/*+queries+and+anchors+*/
++++if+($rel[0]=='#'+%7C%7C+$rel[0]=='?')+return+$base.$rel;

++++/*+parse+base+URL+and+convert+to+local+variables:
+++++++$scheme,+$host,+$path+*/
++++extract(parse_url($base));

++++/*+remove+non-directory+element+from+path+*/
++++$path+=+preg_replace('#/[%5E/]*$#',+'',+$path);

++++/*+destroy+path+if+relative+url+points+to+root+*/
++++if+($rel[0]+==+'/')+$path+=+'';

++++/*+dirty+absolute+URL+//+with+port+number+if+exists+*/
++++if+(parse_url($base,+PHP_URL_PORT)+!=+''){
++++++++$abs+=+"$host:".parse_url($base,+PHP_URL_PORT)."$path/$rel";
++++}else{
++++++++$abs+=+"$host$path/$rel";
++++}
++++/*+replace+'//'+or+'/./'+or+'/foo/../'+with+'/'+*/
++++$re+=+array('#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#');
++++for($n=1;+$n>0;+$abs=preg_replace($re,+'/',+$abs,+-1,+$n))+{}

++++/*+absolute+URL+is+ready!+*/
++++return+$scheme.'://'.$abs;
}|code-block|syntax|javascript|849493|希望这对某些人有帮助！|849494|entityMap|0|LINK|mutability|MUTABLE|url|http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL^0|6|20|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

I used the same code from: <a href="http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL" rel="nofollow">http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL</a>
but I modified It a little bit so If base url contains PORT number it returns the relative URL with port number in it.

<pre><code>function rel2abs($rel, $base)
{
 /* return if already absolute URL */
 if (parse_url($rel, PHP_URL_SCHEME) != '') return $rel;

 /* queries and anchors */
 if ($rel[0]=='#' || $rel[0]=='?') return $base.$rel;

 /* parse base URL and convert to local variables:
 $scheme, $host, $path */
 extract(parse_url($base));

 /* remove non-directory element from path */
 $path = preg_replace('#/[^/]*$#', '', $path);

 /* destroy path if relative url points to root */
 if ($rel[0] == '/') $path = '';

 /* dirty absolute URL // with port number if exists */
 if (parse_url($base, PHP_URL_PORT) != ''){
 $abs = "$host:".parse_url($base, PHP_URL_PORT)."$path/$rel";
 }else{
 $abs = "$host$path/$rel";
 }
 /* replace '//' or '/./' or '/foo/../' with '/' */
 $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
 for($n=1; $n&gt;0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

 /* absolute URL is ready! */
 return $scheme.'://'.$abs;
}
</code></pre>

Hope this helps someone!

blocks|key|1063884|text|我喜欢jordanstephens从链接中提供的代码！我投了赞成票。l0oky给了我灵感，让我确保这个函数是端口、用户名和密码兼容的。我的项目需要它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063885|function+rel2abs(+$rel,+$base+)
{
++++/*+return+if+already+absolute+URL+*/
++++if(+parse_url($rel,+PHP_URL_SCHEME)+!=+''+)
++++++++return(+$rel+);

++++/*+queries+and+anchors+*/
++++if(+$rel[0]=='#'+%7C%7C+$rel[0]=='?'+)
++++++++return(+$base.$rel+);

++++/*+parse+base+URL+and+convert+to+local+variables:
+++++++$scheme,+$host,+$path+*/
++++extract(+parse_url($base)+);

++++/*+remove+non-directory+element+from+path+*/
++++$path+=+preg_replace(+'#/[%5E/]*$#',+'',+$path+);

++++/*+destroy+path+if+relative+url+points+to+root+*/
++++if(+$rel[0]+==+'/'+)
++++++++$path+=+'';

++++/*+dirty+absolute+URL+*/
++++$abs+=+'';

++++/*+do+we+have+a+user+in+our+URL?+*/
++++if(+isset($user)+)
++++{
++++++++$abs.=+$user;

++++++++/*+password+too?+*/
++++++++if(+isset($pass)+)
++++++++++++$abs.=+':'.$pass;

++++++++$abs.=+'@';
++++}

++++$abs.=+$host;

++++/*+did+somebody+sneak+in+a+port?+*/
++++if(+isset($port)+)
++++++++$abs.=+':'.$port;

++++$abs.=$path.'/'.$rel;

++++/*+replace+'//'+or+'/./'+or+'/foo/../'+with+'/'+*/
++++$re+=+array('#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#');
++++for(+$n=1;+$n>0;+$abs=preg_replace(+$re,+'/',+$abs,+-1,+$n+)+)+{}

++++/*+absolute+URL+is+ready!+*/
++++return(+$scheme.'://'.$abs+);
}|code-block|syntax|javascript|1063886|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I love the code that jordanstephens provided from the link! I voted it up. l0oky inspired me to make sure that the function is port, username, and password URL compatible. I needed it for my project.

<pre><code>function rel2abs( $rel, $base )
{
 /* return if already absolute URL */
 if( parse_url($rel, PHP_URL_SCHEME) != '' )
 return( $rel );

 /* queries and anchors */
 if( $rel[0]=='#' || $rel[0]=='?' )
 return( $base.$rel );

 /* parse base URL and convert to local variables:
 $scheme, $host, $path */
 extract( parse_url($base) );

 /* remove non-directory element from path */
 $path = preg_replace( '#/[^/]*$#', '', $path );

 /* destroy path if relative url points to root */
 if( $rel[0] == '/' )
 $path = '';

 /* dirty absolute URL */
 $abs = '';

 /* do we have a user in our URL? */
 if( isset($user) )
 {
 $abs.= $user;

 /* password too? */
 if( isset($pass) )
 $abs.= ':'.$pass;

 $abs.= '@';
 }

 $abs.= $host;

 /* did somebody sneak in a port? */
 if( isset($port) )
 $abs.= ':'.$port;

 $abs.=$path.'/'.$rel;

 /* replace '//' or '/./' or '/foo/../' with '/' */
 $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
 for( $n=1; $n&gt;0; $abs=preg_replace( $re, '/', $abs, -1, $n ) ) {}

 /* absolute URL is ready! */
 return( $scheme.'://'.$abs );
}
</code></pre>

blocks|key|849585|text|添加了保留当前查询的支持。对?page=1等帮助很大。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849586|function+rel2abs($rel,+$base)
{
++++/*+return+if+already+absolute+URL+*/
++++if+(parse_url($rel,+PHP_URL_SCHEME)+!=+'')
++++++++return+($rel);

++++/*+queries+and+anchors+*/
++++if+($rel[0]+==+'#'+%7C%7C+$rel[0]+==+'?')
++++++++return+($base+.+$rel);

++++/*+parse+base+URL+and+convert+to+local+variables:+$scheme,+$host,+$path,+$query,+$port,+$user,+$pass+*/
++++extract(parse_url($base));

++++/*+remove+non-directory+element+from+path+*/
++++$path+=+preg_replace('#/[%5E/]*$#',+'',+$path);

++++/*+destroy+path+if+relative+url+points+to+root+*/
++++if+($rel[0]+==+'/')
++++++++$path+=+'';

++++/*+dirty+absolute+URL+*/
++++$abs+=+'';

++++/*+do+we+have+a+user+in+our+URL?+*/
++++if+(isset($user))+{
++++++++$abs+.=+$user;

++++++++/*+password+too?+*/
++++++++if+(isset($pass))
++++++++++++$abs+.=+':'+.+$pass;

++++++++$abs+.=+'@';
++++}

++++$abs+.=+$host;

++++/*+did+somebody+sneak+in+a+port?+*/
++++if+(isset($port))
++++++++$abs+.=+':'+.+$port;

++++$abs+.=+$path+.+'/'+.+$rel+.+(isset($query)+?+'?'+.+$query+:+'');

++++/*+replace+'//'+or+'/./'+or+'/foo/../'+with+'/'+*/
++++$re+=+['#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#'];
++++for+($n+=+1;+$n+>+0;+$abs+=+preg_replace($re,+'/',+$abs,+-1,+$n))+{
++++}

++++/*+absolute+URL+is+ready!+*/

++++return+($scheme+.+'://'+.+$abs);
}|code-block|syntax|javascript|849587|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Added support to keep the current query. Helps a lot for ?page=1 and so on...

<pre><code>function rel2abs($rel, $base)
{
 /* return if already absolute URL */
 if (parse_url($rel, PHP_URL_SCHEME) != '')
 return ($rel);

 /* queries and anchors */
 if ($rel[0] == '#' || $rel[0] == '?')
 return ($base . $rel);

 /* parse base URL and convert to local variables: $scheme, $host, $path, $query, $port, $user, $pass */
 extract(parse_url($base));

 /* remove non-directory element from path */
 $path = preg_replace('#/[^/]*$#', '', $path);

 /* destroy path if relative url points to root */
 if ($rel[0] == '/')
 $path = '';

 /* dirty absolute URL */
 $abs = '';

 /* do we have a user in our URL? */
 if (isset($user)) {
 $abs .= $user;

 /* password too? */
 if (isset($pass))
 $abs .= ':' . $pass;

 $abs .= '@';
 }

 $abs .= $host;

 /* did somebody sneak in a port? */
 if (isset($port))
 $abs .= ':' . $port;

 $abs .= $path . '/' . $rel . (isset($query) ? '?' . $query : '');

 /* replace '//' or '/./' or '/foo/../' with '/' */
 $re = ['#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'];
 for ($n = 1; $n &gt; 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
 }

 /* absolute URL is ready! */

 return ($scheme . '://' . $abs);
}
</code></pre>

blocks|key|849649|text|我更新了函数，修复了以'//‘开头的相对URL，提高了执行速度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849650|function+getAbsoluteUrl($relativeUrl,+$baseUrl){

++++//+if+already+absolute+URL+
++++if+(parse_url($relativeUrl,+PHP_URL_SCHEME)+!==+null){
++++++++return+$relativeUrl;
++++}

++++//+queries+and+anchors
++++if+($relativeUrl[0]+===+'#'+%7C%7C+$relativeUrl[0]+===+'?'){
++++++++return+$baseUrl.$relativeUrl;
++++}

++++//+parse+base+URL+and+convert+to:+$scheme,+$host,+$path,+$query,+$port,+$user,+$pass
++++extract(parse_url($baseUrl));

++++//+if+base+URL+contains+a+path+remove+non-directory+elements+from+$path
++++if+(isset($path)+===+true){
++++++++$path+=+preg_replace('#/[%5E/]*$#',+'',+$path);
++++}
++++else+{
++++++++$path+=+'';
++++}

++++//+if+realtive+URL+starts+with+//
++++if+(substr($relativeUrl,+0,+2)+===+'//'){
++++++++return+$scheme.':'.$relativeUrl;
++++}

++++//+if+realtive+URL+starts+with+/
++++if+($relativeUrl[0]+===+'/'){
++++++++$path+=+null;
++++}

++++$abs+=+null;

++++//+if+realtive+URL+contains+a+user
++++if+(isset($user)+===+true){
++++++++$abs+.=+$user;

++++++++//+if+realtive+URL+contains+a+password
++++++++if+(isset($pass)+===+true){
++++++++++++$abs+.=+':'.$pass;
++++++++}

++++++++$abs+.=+'@';
++++}

++++$abs+.=+$host;

++++//+if+realtive+URL+contains+a+port
++++if+(isset($port)+===+true){
++++++++$abs+.=+':'.$port;
++++}

++++$abs+.=+$path.'/'.$relativeUrl.(isset($query)+===+true+?+'?'.$query+:+null);

++++//+replace+//+or+/./+or+/foo/../+with+/
++++$re+=+['#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#'];
++++for+($n+=+1;+$n+>+0;+$abs+=+preg_replace($re,+'/',+$abs,+-1,+$n))+{
++++}

++++//+return+absolute+URL
++++return+$scheme.'://'.$abs;

}|code-block|syntax|javascript|849651|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I updated the function to fix relative URL starting with '//' improving execution speed.

<pre><code>function getAbsoluteUrl($relativeUrl, $baseUrl){

 // if already absolute URL 
 if (parse_url($relativeUrl, PHP_URL_SCHEME) !== null){
 return $relativeUrl;
 }

 // queries and anchors
 if ($relativeUrl[0] === '#' || $relativeUrl[0] === '?'){
 return $baseUrl.$relativeUrl;
 }

 // parse base URL and convert to: $scheme, $host, $path, $query, $port, $user, $pass
 extract(parse_url($baseUrl));

 // if base URL contains a path remove non-directory elements from $path
 if (isset($path) === true){
 $path = preg_replace('#/[^/]*$#', '', $path);
 }
 else {
 $path = '';
 }

 // if realtive URL starts with //
 if (substr($relativeUrl, 0, 2) === '//'){
 return $scheme.':'.$relativeUrl;
 }

 // if realtive URL starts with /
 if ($relativeUrl[0] === '/'){
 $path = null;
 }

 $abs = null;

 // if realtive URL contains a user
 if (isset($user) === true){
 $abs .= $user;

 // if realtive URL contains a password
 if (isset($pass) === true){
 $abs .= ':'.$pass;
 }

 $abs .= '@';
 }

 $abs .= $host;

 // if realtive URL contains a port
 if (isset($port) === true){
 $abs .= ':'.$port;
 }

 $abs .= $path.'/'.$relativeUrl.(isset($query) === true ? '?'.$query : null);

 // replace // or /./ or /foo/../ with /
 $re = ['#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'];
 for ($n = 1; $n &gt; 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
 }

 // return absolute URL
 return $scheme.'://'.$abs;

}
</code></pre>

blocks|key|849655|text|function+url_to_absolute($baseURL,+$relativeURL)+{++
++++$relativeURL_data+=+parse_url($relativeURL);

++++if+(isset($relativeURL_data['scheme']))+{
++++++++return+$relativeURL;
++++}

++++$baseURL_data+=+parse_url($baseURL);

++++if+(!isset($baseURL_data['scheme']))+{
++++++++return+$relativeURL;
++++}

++++$absoluteURL_data+=+$baseURL_data;

++++if+(isset($relativeURL_data['path'])+&&+$relativeURL_data['path'])+{
++++++++if+(substr($relativeURL_data['path'],+0,+1)+==+'/')+{
++++++++++++$absoluteURL_data['path']+=+$relativeURL_data['path'];
++++++++}+else+{
++++++++++++$absoluteURL_data['path']+=+(isset($absoluteURL_data['path'])+?+preg_replace('#[%5E/]*$#',+'',+$absoluteURL_data['path'])+:+'/')+.+$relativeURL_data['path'];
++++++++}

++++++++if+(isset($relativeURL_data['query']))+{
++++++++++++$absoluteURL_data['query']+=+$relativeURL_data['query'];
++++++++}+else+if+(isset($absoluteURL_data['query']))+{
++++++++++++unset($absoluteURL_data['query']);
++++++++}
++++}+else+{
++++++++$absoluteURL_data['path']+=+isset($absoluteURL_data['path'])+?+$absoluteURL_data['path']+:+'/';

++++++++if+(isset($relativeURL_data['query']))+{
++++++++++++$absoluteURL_data['query']+=+$relativeURL_data['query'];
++++++++}+else+if+(isset($absoluteURL_data['query']))+{
++++++++++++$absoluteURL_data['query']+=+$absoluteURL_data['query'];
++++++++}
++++}

++++if+(isset($relativeURL_data['fragment']))+{
++++++++$absoluteURL_data['fragment']+=+$relativeURL_data['fragment'];
++++}+else+if+(isset($absoluteURL_data['fragment']))+{
++++++++unset($absoluteURL_data['fragment']);
++++}

++++$absoluteURL_path+=+ltrim($absoluteURL_data['path'],+'/');
++++$absoluteURL_path_parts+=+array();

++++for+($i+=+0,+$i2+=+0;+$i+<+strlen($absoluteURL_path);+$i%2B%2B)+{
++++++++if+(isset($absoluteURL_path_parts[$i2]))+{
++++++++++++$absoluteURL_path_parts[$i2]+.=+$absoluteURL_path[$i];
++++++++}+else+{
++++++++++++$absoluteURL_path_parts[$i2]+=+$absoluteURL_path[$i];
++++++++}

++++++++if+($absoluteURL_path[$i]+==+'/')+{
++++++++++++$i2%2B%2B;
++++++++}
++++}

++++reset($absoluteURL_path_parts);

++++while+(true)+{
++++++++if+(rtrim(current($absoluteURL_path_parts),+'/')+==+'.')+{
++++++++++++unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);

++++++++++++continue;
++++++++}+else+if+(rtrim(current($absoluteURL_path_parts),+'/')+==+'..')+{
++++++++++++if+(prev($absoluteURL_path_parts)+!==+false)+{
++++++++++++++++unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);
++++++++++++}+else+{
++++++++++++++++reset($absoluteURL_path_parts);
++++++++++++}

++++++++++++unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);

++++++++++++continue;
++++++++}

++++++++if+(next($absoluteURL_path_parts)+===+false)+{
++++++++++++break;
++++++++}
++++}

++++$absoluteURL_data['path']+=+'/'+.+implode('',+$absoluteURL_path_parts);

++++$absoluteURL+=+isset($absoluteURL_data['scheme'])+?+$absoluteURL_data['scheme']+.+':'+:+'';
++++$absoluteURL+.=+(isset($absoluteURL_data['user'])+%7C%7C+isset($absoluteURL_data['host']))+?+'//'+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['user'])+?+$absoluteURL_data['user']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['pass'])+?+':'+.+$absoluteURL_data['pass']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['user'])+?+'@'+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['host'])+?+$absoluteURL_data['host']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['port'])+?+':'+.+$absoluteURL_data['port']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['path'])+?+$absoluteURL_data['path']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['query'])+?+'?'+.+$absoluteURL_data['query']+:+'';
++++$absoluteURL+.=+isset($absoluteURL_data['fragment'])+?+'#'+.+$absoluteURL_data['fragment']+:+'';

++++return+$absoluteURL;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|849656|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function url_to_absolute($baseURL, $relativeURL) { 
 $relativeURL_data = parse_url($relativeURL);

 if (isset($relativeURL_data['scheme'])) {
 return $relativeURL;
 }

 $baseURL_data = parse_url($baseURL);

 if (!isset($baseURL_data['scheme'])) {
 return $relativeURL;
 }

 $absoluteURL_data = $baseURL_data;

 if (isset($relativeURL_data['path']) &amp;&amp; $relativeURL_data['path']) {
 if (substr($relativeURL_data['path'], 0, 1) == '/') {
 $absoluteURL_data['path'] = $relativeURL_data['path'];
 } else {
 $absoluteURL_data['path'] = (isset($absoluteURL_data['path']) ? preg_replace('#[^/]*$#', '', $absoluteURL_data['path']) : '/') . $relativeURL_data['path'];
 }

 if (isset($relativeURL_data['query'])) {
 $absoluteURL_data['query'] = $relativeURL_data['query'];
 } else if (isset($absoluteURL_data['query'])) {
 unset($absoluteURL_data['query']);
 }
 } else {
 $absoluteURL_data['path'] = isset($absoluteURL_data['path']) ? $absoluteURL_data['path'] : '/';

 if (isset($relativeURL_data['query'])) {
 $absoluteURL_data['query'] = $relativeURL_data['query'];
 } else if (isset($absoluteURL_data['query'])) {
 $absoluteURL_data['query'] = $absoluteURL_data['query'];
 }
 }

 if (isset($relativeURL_data['fragment'])) {
 $absoluteURL_data['fragment'] = $relativeURL_data['fragment'];
 } else if (isset($absoluteURL_data['fragment'])) {
 unset($absoluteURL_data['fragment']);
 }

 $absoluteURL_path = ltrim($absoluteURL_data['path'], '/');
 $absoluteURL_path_parts = array();

 for ($i = 0, $i2 = 0; $i &lt; strlen($absoluteURL_path); $i++) {
 if (isset($absoluteURL_path_parts[$i2])) {
 $absoluteURL_path_parts[$i2] .= $absoluteURL_path[$i];
 } else {
 $absoluteURL_path_parts[$i2] = $absoluteURL_path[$i];
 }

 if ($absoluteURL_path[$i] == '/') {
 $i2++;
 }
 }

 reset($absoluteURL_path_parts);

 while (true) {
 if (rtrim(current($absoluteURL_path_parts), '/') == '.') {
 unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);

 continue;
 } else if (rtrim(current($absoluteURL_path_parts), '/') == '..') {
 if (prev($absoluteURL_path_parts) !== false) {
 unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);
 } else {
 reset($absoluteURL_path_parts);
 }

 unset($absoluteURL_path_parts[key($absoluteURL_path_parts)]);

 continue;
 }

 if (next($absoluteURL_path_parts) === false) {
 break;
 }
 }

 $absoluteURL_data['path'] = '/' . implode('', $absoluteURL_path_parts);

 $absoluteURL = isset($absoluteURL_data['scheme']) ? $absoluteURL_data['scheme'] . ':' : '';
 $absoluteURL .= (isset($absoluteURL_data['user']) || isset($absoluteURL_data['host'])) ? '//' : '';
 $absoluteURL .= isset($absoluteURL_data['user']) ? $absoluteURL_data['user'] : '';
 $absoluteURL .= isset($absoluteURL_data['pass']) ? ':' . $absoluteURL_data['pass'] : '';
 $absoluteURL .= isset($absoluteURL_data['user']) ? '@' : '';
 $absoluteURL .= isset($absoluteURL_data['host']) ? $absoluteURL_data['host'] : '';
 $absoluteURL .= isset($absoluteURL_data['port']) ? ':' . $absoluteURL_data['port'] : '';
 $absoluteURL .= isset($absoluteURL_data['path']) ? $absoluteURL_data['path'] : '';
 $absoluteURL .= isset($absoluteURL_data['query']) ? '?' . $absoluteURL_data['query'] : '';
 $absoluteURL .= isset($absoluteURL_data['fragment']) ? '#' . $absoluteURL_data['fragment'] : '';

 return $absoluteURL;
}
</code></pre>

blocks|key|1063996|text|这套@jordansstephens的答案不支持绝对url，以'//‘开头。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063997|function+rel2abs($rel,+$base)
{
++++/*+return+if+already+absolute+URL+*/
++++if+(parse_url($rel,+PHP_URL_SCHEME)+!=+'')+return+$rel;

++++/*+Url+begins+with+//+*/
++++if($rel[0]+==+'/'+&&+$rel[1]+==+'/'){
++++++++return+'https:'+.+$rel;
++++}

++++/*+queries+and+anchors+*/
++++if+($rel[0]=='#'+%7C%7C+$rel[0]=='?')+return+$base.$rel;

++++/*+parse+base+URL+and+convert+to+local+variables:
+++++++$scheme,+$host,+$path+*/
++++extract(parse_url($base));

++++/*+remove+non-directory+element+from+path+*/
++++$path+=+preg_replace('#/[%5E/]*$#',+'',+$path);

++++/*+destroy+path+if+relative+url+points+to+root+*/
++++if+($rel[0]+==+'/')+$path+=+'';

++++/*+dirty+absolute+URL+*/
++++$abs+=+"$host$path/$rel";

++++/*+replace+'//'+or+'/./'+or+'/foo/../'+with+'/'+*/
++++$re+=+array('#(/\.?/)#',+'#/(?!\.\.)[%5E/]%2B/\.\./#');
++++for($n=1;+$n>0;+$abs=preg_replace($re,+'/',+$abs,+-1,+$n))+{}

++++/*+absolute+URL+is+ready!+*/
++++return+$scheme.'://'.$abs;
}|code-block|syntax|javascript|1063998|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This make suit of @jordansstephens's answer who doesn't support absolute url begins with '//'.
<pre><code>function rel2abs($rel, $base)
{
 /* return if already absolute URL */
 if (parse_url($rel, PHP_URL_SCHEME) != '') return $rel;

 /* Url begins with // */
 if($rel[0] == '/' &amp;&amp; $rel[1] == '/'){
 return 'https:' . $rel;
 }

 /* queries and anchors */
 if ($rel[0]=='#' || $rel[0]=='?') return $base.$rel;

 /* parse base URL and convert to local variables:
 $scheme, $host, $path */
 extract(parse_url($base));

 /* remove non-directory element from path */
 $path = preg_replace('#/[^/]*$#', '', $path);

 /* destroy path if relative url points to root */
 if ($rel[0] == '/') $path = '';

 /* dirty absolute URL */
 $abs = &quot;$host$path/$rel&quot;;

 /* replace '//' or '/./' or '/foo/../' with '/' */
 $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
 for($n=1; $n&gt;0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

 /* absolute URL is ready! */
 return $scheme.'://'.$abs;
}
</code></pre>

blocks|key|849706|text|此版本将以与web浏览器相同的方式解析相对URL。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849707|function+build_url($parts)
{
++++$url+=+$parts['scheme']+.+'://';

++++if+(!+empty($parts['user']))+{
++++++++$url+.=+$parts['user'];
++++}

++++if+(!+empty($parts['pass']))+{
++++++++$url+.=+':'+.+$parts['pass'];
++++}

++++if+(!+empty($parts['user']))+{
++++++++$url+.=+'@';
++++}

++++$url+.=+$parts['host'];

++++if+(!+empty($parts['port']))+{
++++++++$url+.=+':'+.+$parts['port'];
++++}

++++if+(!+empty($parts['path']))+{
++++++++$url+.=+$parts['path'];
++++}

++++if+(!+empty($parts['query']))+{
++++++++$url+.=+'?'+.+$parts['query'];
++++}

++++if+(!+empty($parts['fragment']))+{
++++++++$url+.=+'#'+.+$parts['fragment'];
++++}

++++return+$url;
}

function+absurl($url,+$base)
{
++++$base+=+parse_url($base);
++++$_url+=+parse_url($url);

++++if+(!+empty($_url['scheme']))+{
++++++++//+The+URL+is+already+absolute
++++++++return+$url;
++++}+

++++if+(!+empty($_url['host']))+{
++++++++//+The+URL+is+only+missing+the+scheme
++++++++return+$base["scheme"]+.+':'+.+$url;
++++}

++++if+(!+empty($_url['path']))+{
++++++++//+Combine+path+and+overwrite+base+url+query+and+fragment
++++++++unset($base["query"]);
++++++++unset($base["fragment"]);

++++++++if+(substr($_url['path'],+0,+1)+!=+'/')+{
++++++++++++$array+=+explode('/',+$_url['path']);

++++++++++++if+(!+empty($base['path']))+{
++++++++++++++++$_array+=+explode('/',+$base['path']);

++++++++++++++++#+Remove+the+file+and/or+empty+path+name(s)
++++++++++++++++$_array+=+array_slice($_array,+1,+-+1);

++++++++++++++++$array+=+array_merge($_array,+$array);
++++++++++++}

++++++++++++$path+=+array();
++++++++++++foreach+($array+as+$dir)+{
++++++++++++++++if+($dir+==+'..')+{
++++++++++++++++++++array_pop($path);
++++++++++++++++}+elseif+($dir+!=+'.')+{
++++++++++++++++++++$path[]+=+$dir;
++++++++++++++++}
++++++++++++}
++++++++++++$_url['path']+=+"/"+.+implode('/',+$path);
++++++++}
++++}+elseif+(!+empty($_url['query']))+{
++++++++//+Overwrite+base+url+query+and+fragment
++++++++unset($base["fragment"]);
++++}
++++//+else:+Overwrite+base+url+fragment

++++return+build_url(array_merge($base,+$_url));
}

$base_url+=+'https://example.com/path1/path2/path3/path4/file.ext?field1=value1&field2=value2#fragment';

echo+absurl("https://_example.com/_path1/_path2/_file.ext?_field1=_value1&_field2=_value2#_fragment",+$base_url)+.+"\n";
echo+absurl("//_example.com/_path1/_path2/_file.ext?_field1=_value1&_field2=_value2#_fragment",+$base_url)+.+"\n";
echo+absurl("//_example.com",+$base_url)+.+"\n";
echo+absurl("/_path1/_path2/_file.ext?_field1=_value1&_field2=_value2#_fragment",+$base_url)+.+"\n";
echo+absurl("_path1/_path2/_file.ext",+$base_url)+.+"\n";
echo+absurl("./../../_path1/../_path2/file.ext#_fragment",+$base_url)+.+"\n";
echo+absurl("?_field1=_value1&_field2=_value2#_fragment",+$base_url)+.+"\n";
echo+absurl("#_fragment",+$base_url)+.+"\n";|code-block|syntax|javascript|849708|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This version will resolve relative URLs in the same way as web browsers.
<pre><code>function build_url($parts)
{
 $url = $parts['scheme'] . '://';

 if (! empty($parts['user'])) {
 $url .= $parts['user'];
 }

 if (! empty($parts['pass'])) {
 $url .= ':' . $parts['pass'];
 }

 if (! empty($parts['user'])) {
 $url .= '@';
 }

 $url .= $parts['host'];

 if (! empty($parts['port'])) {
 $url .= ':' . $parts['port'];
 }

 if (! empty($parts['path'])) {
 $url .= $parts['path'];
 }

 if (! empty($parts['query'])) {
 $url .= '?' . $parts['query'];
 }

 if (! empty($parts['fragment'])) {
 $url .= '#' . $parts['fragment'];
 }

 return $url;
}

function absurl($url, $base)
{
 $base = parse_url($base);
 $_url = parse_url($url);

 if (! empty($_url['scheme'])) {
 // The URL is already absolute
 return $url;
 } 

 if (! empty($_url['host'])) {
 // The URL is only missing the scheme
 return $base[&quot;scheme&quot;] . ':' . $url;
 }

 if (! empty($_url['path'])) {
 // Combine path and overwrite base url query and fragment
 unset($base[&quot;query&quot;]);
 unset($base[&quot;fragment&quot;]);

 if (substr($_url['path'], 0, 1) != '/') {
 $array = explode('/', $_url['path']);

 if (! empty($base['path'])) {
 $_array = explode('/', $base['path']);

 # Remove the file and/or empty path name(s)
 $_array = array_slice($_array, 1, - 1);

 $array = array_merge($_array, $array);
 }

 $path = array();
 foreach ($array as $dir) {
 if ($dir == '..') {
 array_pop($path);
 } elseif ($dir != '.') {
 $path[] = $dir;
 }
 }
 $_url['path'] = &quot;/&quot; . implode('/', $path);
 }
 } elseif (! empty($_url['query'])) {
 // Overwrite base url query and fragment
 unset($base[&quot;fragment&quot;]);
 }
 // else: Overwrite base url fragment

 return build_url(array_merge($base, $_url));
}

$base_url = 'https://example.com/path1/path2/path3/path4/file.ext?field1=value1&amp;field2=value2#fragment';

echo absurl(&quot;https://_example.com/_path1/_path2/_file.ext?_field1=_value1&amp;_field2=_value2#_fragment&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;//_example.com/_path1/_path2/_file.ext?_field1=_value1&amp;_field2=_value2#_fragment&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;//_example.com&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;/_path1/_path2/_file.ext?_field1=_value1&amp;_field2=_value2#_fragment&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;_path1/_path2/_file.ext&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;./../../_path1/../_path2/file.ext#_fragment&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;?_field1=_value1&amp;_field2=_value2#_fragment&quot;, $base_url) . &quot;\n&quot;;
echo absurl(&quot;#_fragment&quot;, $base_url) . &quot;\n&quot;;
</code></pre>

How to, using php, transform relative path to absolute URL?

Transform relative path into absolute URL using PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

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如何使用php将相对路径转换为绝对URL？

问使用PHP将相对路径转换为绝对URL
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