使用PHP将相对路径转换为绝对URL

时间：2010-12-14 21:34:58

标签： php parsing relative-path

如何使用php将相对路径转换为绝对URL？

12 个答案:

答案 0 :(得分：36)

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>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

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

答案 1 :(得分：6)

我喜欢jordanstephens从链接中提供的代码！我投票了。 l0oky启发我确保该功能是端口，用户名和密码URL兼容。我的项目需要它。

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>0; $abs=preg_replace( $re, '/', $abs, -1, $n ) ) {}

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

答案 2 :(得分：4)

添加了支持以保留当前查询。帮助很多？页面= 1等等...... 

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 > 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
    }

    /* absolute URL is ready! */

    return ($scheme . '://' . $abs);
}

答案 3 :(得分：1)

事实上不是关于转换路径而不是网址的问题？ PHP实际上有一个函数：realpath()。你唯一应该注意的是符号链接。

PHP手册中的示例：

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

echo realpath('/tmp/') . PHP_EOL;
// Prints: /tmp

答案 4 :(得分：0)

我更新了以“ //”开头的相对URL的功能，从而提高了执行速度。

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 > 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
    }

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

}

答案 5 :(得分：0)

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('#[^/]*$#', '', $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); $i++) {
        if (isset($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;
}

答案 6 :(得分：0)

@jordansstephens的答案（不支持绝对网址）以'//'开头。

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]=='#' || $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>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

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

答案 7 :(得分：0)

此版本将以与网络浏览器相同的方式解析相对 URL。

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";

答案 8 :(得分：0)

你可以使用这个 composer 包来做到这一点。 https://packagist.org/packages/wa72/url

<块引用>

作曲家需要 wa72/url

  • 将 URL 字符串解析为对象

  • 添加和修改查询参数

  • 设置和修改url的任何部分

  • 用 PHP 风格的查询参数测试 URL 是否相等 方式

  • 支持协议相对网址

  • 将绝对、主机相关和协议相关的 url 转换为 相对，反之亦然

答案 9 :(得分：-1)

如果相对目录已经存在，这将完成工作：

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

答案 10 :(得分：-1)

此功能会将相对网址解析为$pgurl 中没有正则表达式的给定当前页面网址。它成功解决了：

/home.php?example种类，

same-dir nextpage.php类型，

../...../.../parentdir种类，

完整的http://example.net网址，

和简写//example.net网址

//Current base URL (you can dynamically retrieve from $_SERVER)
$pgurl = 'http://example.com/scripts/php/absurl.php';

function absurl($url) {
 global $pgurl;
 if(strpos($url,'://')) return $url; //already absolute
 if(substr($url,0,2)=='//') return 'http:'.$url; //shorthand scheme
 if($url[0]=='/') return parse_url($pgurl,PHP_URL_SCHEME).'://'.parse_url($pgurl,PHP_URL_HOST).$url; //just add domain
 if(strpos($pgurl,'/',9)===false) $pgurl .= '/'; //add slash to domain if needed
 return substr($pgurl,0,strrpos($pgurl,'/')+1).$url; //for relative links, gets current directory and appends new filename
}

function nodots($path) { //Resolve dot dot slashes, no regex!
 $arr1 = explode('/',$path);
 $arr2 = array();
 foreach($arr1 as $seg) {
  switch($seg) {
   case '.':
    break;
   case '..':
    array_pop($arr2);
    break;
   case '...':
    array_pop($arr2); array_pop($arr2);
    break;
   case '....':
    array_pop($arr2); array_pop($arr2); array_pop($arr2);
    break;
   case '.....':
    array_pop($arr2); array_pop($arr2); array_pop($arr2); array_pop($arr2);
    break;
   default:
    $arr2[] = $seg;
  }
 }
 return implode('/',$arr2);
}

用法示例：

echo nodots(absurl('../index.html'));
在将URL转换为绝对值后，

nodots()必须被称为。

点功能有点冗余，但是可读，快速，不使用正则表达式，并且将解析99％的典型网址（如果你想100％确定，只需扩展切换块以支持6+点，虽然我从来没有在URL中看到那么多点。）

希望这有帮助，

答案 11 :(得分：-2)

我使用了相同的代码：http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL 但是我对它进行了一些修改，如果基本网址包含PORT编号，则会返回包含端口号的相对URL。

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>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

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

希望这有助于某人！

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