使用PHP将相对路径转换成绝对URL

Question

如何使用PHP将相对路径转换为绝对URL？

Answer 1

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;

}

Answer 2

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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 );

}

Answer 3

添加了对保留当前查询的支持。对？page = 1很有帮助，依此类推...

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);

}