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$parse $root $p $base Associative array derived from parsing $page String comprising the first part of $page up to and including the host domain name Integer pointer to the final / in $page The current directory where $page is located
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In order to convert a URL from relative to absolute it s necessary to know where the relative URL is relative to This is why the main page URL is passed along with the relative URL In fact, not all the URLs passed may be relative, and they could even all be absolute, depending on how $page has been written But what this plug-in does is process a URL anyway, and if it s determined to be relative, then it s turned into an absolute URL It does this by first parsing the original URL, passed in $page, and extracting the scheme (for example, http:// or ftp://, and so on) and host (such as myservercom) and combining just these two parts together into the string variable $root to create, for example, the string http://myservercom Then, $page is examined to see if there are any / characters after the initial http:// If so, the final one is located and its position is placed in $p If there isn t one, then $p is set to 0 Using this value, $base is assigned either the substring of $page all the way up to and including the final /, or if there wasn t one, $base is assigned the value of $page itself, but with a final / appended to it Either way, $base now represents the location of the directory containing $page Next $url is examined, and if it starts with a /, then it must be a relative URL referring to an offset from the domain s document root In which case $url is replaced with a value comprising the concatenation of $root and $url So, for example, http://myservercom and / news/indexhtml would combine to become http://myservercom/news/indexhtml If $url doesn t start with a /, then a test is made to see whether it begins with http:// If not, the URL must also be relative, but this time it is relative to the directory location of $page, so $url is replaced with a value comprising the concatenation of $base and $url So, for example, http://myservercom/sport and resultshtml would combine to become http:// myservercom/sport/resultshtml If both these tests fail, then $url commences with http:// and therefore is an absolute URL and cannot be converted It is therefore returned unchanged
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NOTE For the sake of speed and simplicity, a complete relative-to-absolute URL conversion is not
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made For example, the URL /news/indexhtml in the page http://myservercom/sport/ is not converted to http://myservercom/news/indexhtml Instead it becomes http:// myservercom/sport//news/indexhtml This saves the code having to further parse a URL, locating examples of / and then removing the directory immediately previous to it There s no need because this longer form of absolute URL is perfectly valid and works just fine
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To use this plug-in, pass it the full URL of a page that contains a relative link, along with the relative link itself, like this:
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$page = "http://sitecom/news/current/science/indexhtml"; $link = "//prev/tech/rounduphtml"; echo PIPHP_RelToAbsURL($page, $link);
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The value returned will be an absolute URL that can be used to access the destination page without recourse to the original web page In the preceding case, the following URL will be returned:
http://sitecom/news/current/science///prev/tech/rounduphtml
The Plug-in
function PIPHP_RelToAbsURL($page, $url) { if (substr($page, 0, 7) != "http://") return $url; $parse = parse_url($page); $root = $parse['scheme'] "://" $parse['host']; $p = strrpos(substr($page, 7), '/'); if ($p) $base = substr($page, 0, $p + 8); else $base = "$page/"; if (substr($url, 0, 1) == '/') $url = $root $url; elseif (substr($url, 0, 7) != "http://") $url = $base $url; return $url; }
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