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How to, using php, transform relative path to absolute URL?
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An absolute URL contains all the information necessary to locate a resource. A relative URL locates a resource using an absolute URL as a starting point. In effect, the "complete URL" of the target is specified by concatenating the absolute and relative URLs.
An absolute path refers to a file on the Internet using its full URL, e.g. "http://www.uvsc.edu/disted/php/webct/itr/index.php" A relative path assumes that the file is on the current server, e.g. "php/webct/itr/index. php".
An absolute URL contains more information than a relative URL does. Relative URLs are more convenient because they are shorter and often more portable. However, you can use them only to reference links on the same server as the page that contains them.
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; } 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.
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 ); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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