HTTP

URL sanity checker and rebuilder

Type:	code fragment
Added by:	julian7
Entered:	05/01/2001
Last modified:	01/12/2000
Rating:	- (fewer than 3 votes)
Views:	5324

Gets an URL and converts it to standard format (eg. ftp.somewhere.org - ftp://ftp.somewhere.org/). It can distinguish ftp scheme, when the hostname starts with 'ftp'.

<?php
function urlcheck($url) {

                                $charset = "abcdefghijklmnopqrstuvwxyz"

                                    ."ABCDEFGHIJKLMNOPQRSTUVWXYZ"

                                    ."0123456789"

                                    ."./%_-~:@?#&=";

                                if (!isset($url) || !is_string($url)

                                 || !($len = strlen($url)) || strspn($url, $charset)!=$len)

                                    return false;

                                $URL = parse_url($url);

                                if (strlen($URL["port"]))

                                    $port = ":".$URL["port"];

                                else

                                    $port = "";

                                if (!strlen($URL["user"]))

                                    $user = "";

                                elseif (strlen($URL["pass"]))

                                    $user = $URL["user"].":".$URL["pass"]."@";

                                else

                                    $user = $URL["user"]."@";

                                if (strlen($URL["host"]))

                                    $host = $URL["host"];

                                else {

                                    $host = $URL["path"];

                                    $URL["path"] = "";

                                }

                                if (strlen($URL["path"]))

                                    $path = $URL["path"];

                                else

                                    $path = "/";

                                if (strlen($URL["scheme"]))

                                    $scheme = $URL["scheme"];

                                elseif (substr($host, 0, 3) == "ftp")

                                    $scheme = "ftp";

                                else

                                    $scheme = "http";

                                $query = $URL["query"].$URL["fragment"];

                                return "$scheme://$user$host$port$path$query";

                            }
?>

Usage Example

$url1 = "www.example.com";

                            $url2 = "ftp.nonexistent.dom/bad path";

                            if (!($url = urlcheck($url1))) echo "Bad url $url1<br>n";

                            else echo "$url1 -> $url<br>n";

                            if (!($url = urlcheck($url2))) echo "Bad url $url2<br>n";

                            else echo "$url2 -> $url<br>n";

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