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php sample source codes
This function takes a link url and returns an array of info needed to see if the link is good. If the link is bad or the server is down, the return will be an empty array. The example code given shows how to check links stored in a MySQL database and store the link status. function check_link($link) { $main = array(); $ch = curl_init(); curl_setopt ($ch, CURLOPT_URL, $link); curl_setopt ($ch, CURLOPT_HEADER, 1); curl_setopt ($ch, CURLOPT_NOBODY, 1); curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1); curl_setopt ($ch, CURLOPT_NETRC, 1); curl_setopt ($ch, CURLOPT_TIMEOUT, 10); ob_start(); curl_exec ($ch); $stuff = ob_get_contents(); ob_end_clean(); curl_close ($ch); $parts = split("\n",$stuff,2); $main = split(" ",$parts[0],3); return $main; } // function check_link
A regular expression to match a URL (http and https) in a text and replace it with the A tag. It also matches only www links (written without http://). And it doesn't include a possible character at the end of the link! MOSTLY CODED BY STAN!!! thanx! report any bugs an other features to <a href="mailto:bugs@rawurl.nl">me</a> //============================================================================= // // Function: OUCH // // Input: STRING $str - a text or line // // Output: STRING $str2 - a text or line with the links replaced with a // <A href tag // // Description: This function replaces a http, https or www in a text with a // html A tag // //============================================================================= function OUCH($str) { // case insensitive regexp. // -- protocol tag or www $str2 = preg_replace("!(((http(s?)://)\|(www\.))". // -- rest of the host, topdomain is 2-4 letters "([-a-z0-9.]{2,}\.[a-z]{2,4}". // -- port (optional) "(:[0-9]+)?)". // -- path (optional) "((/([^\s][^\s.,\"'])?)?)". // -- parameters (optional, but obligated to begin with a question mark) "((\?([^\s][^\s.,\"'])?)?))!i", // replace it with <a tag "<a href=\"http\\4://\\5\\6\\8\\9\">\\1</a>", $str); return $str2; }
This simple script validate any valid link or URL. Just write the concerned link in the text box and push the verify button. <? function urlfind($link) { if($link) { $file = @fopen ("$link", "r"); } if($file) { return true ; fclose($file); } } if($link !="") { if((urlfind($link))=="true") { echo "your link exists"; } else { echo "your link doesn't exists" ; } } ?> <html> <head> </head> <body bgcolor="ccdfed"> <h2>Link Checker</h2> <form action="linkzend.php" method=post> <font face="verdana" size=1> <table border=0> <tr><td> Verify your link(e.g: http://zend.com) </td> </tr> <tr> <td><input type=text name=link size="40" > </td></tr> <tr><td> <input type="submit" value="Verify"> </td></tr> </table> <br> <a href="http://openit.de/~sultan/">from : Sultan Zahir Khan</a><br> <a href="mailto://sultanzahir@yahoo.com">email : sultanzahir@yahoo.com</a></font> </body> </html>
It's a build on ones that were made before, I just added the part to actually check if the file exists. I need to modify the caching thing to care about the file part... or maybe not. <? // 000712, steven@haryan.to // 010207, carinridge@hotmail.com (Added file validity check) // 010725, carinridge@hotmail.com (Updated regex, & errors) Thanx to Luis Gonzaga for the heads up... /* an example of usage: <? require "/path/to/this/file"; ?> My validated bookmarks: <ul> <li><? disp_link("http://slashdot.org", "Slashdot"); ?> <li><? disp_link("http://www.zope.org", "Zope"); ?> <li><? disp_link("http://www.python.org", "Python"); ?> <li><? disp_link("http://www.perl.com", "Perl"); ?> <li><? disp_link("http://www.php.net", "Zend"); ?> <li><? disp_link("http://www.perl.com/CPAN-local/", ""); ?> </ul> btw, yup, of course this code is under GPL. / $debug = 0; $timeout = 30; // give up if can't connect within 30 secs. $check_freq = 560; // cache for 5 minutes. session_register('statuses'); session_register('hostnames'); function flush_disp_link_cache() { global $statuses; global $hostnames; $statuses = array(); $hostnames = array(); } function disp_link($url, $text) { global $debug; global $timeout; global $statuses; global $hostnames; global $check_freq; $now = time(); $e = error_reporting(); error_reporting($e & (255-E_WARNING)); if (!preg_match('/^(http\|https\|ftp):\/\/((?:[a-zA-Z0-9_-]+\.?)+):?(\d)/', $url, $m)) { // it's a relative link, or absolute link with unsupported protocol // so there's no need to check $sstatus = ''; if ($debug) { $sstatus='DEBUG:UNCHECKED'; } } else { $proto=$m[1]; $hostname=strtolower($m[2]); $port=$m[3]; // is the host an IP address? if (preg_match('/^\d+\.\d+\.\d+\.\d+/', $hostname)) { $ip = $hostname; } else { // it's not, so we have to resolve it first // have we tried to resolve it not so long ago? $from_cache=0; if (isset($hostnames[$hostname])) { if ($debug) { echo "DEBUG: last resolve = ", $hostnames[$hostname][1], "<br>"; } if ($now - $hostnames[$hostname][1] <= $check_freq) { $ip = $hostnames[$hostname]; $from_cache=1; } } if (!$from_cache) { // we haven't, so resolve it $ip = gethostbyname($hostname); // if the hostname was not resolvable, gethostbyname returns // its argument unchanged if ($ip === $hostname) { $ip=''; } // cache this resolve $hostnames[$hostname]=array($ip,$now); } } if (!$ip) { // was the hostname unresolvable? $sstatus = 'HOST NOT FOUND'; } else { // get universal port number defaults, if not specified if (!$port) { if ($proto == 'http') { $port = 80; } elseif ($proto == 'https') { $port = 443; } elseif ($proto == 'ftp') { $port = 21; } } $key = "$ip:$port"; // have we checked the site not so long ago? $from_cache=0; if (isset($statuses[$key])) { if ($debug) { echo "DEBUG: last check = ",$statuses[$key][2], "<br>"; } if ($now-$statuses[$key][2] <= $check_freq) { $sstatus = $statuses[$key][0]; $from_cache=1; } } if (!$from_cache \|\| ($from_cache && ($sstatus == "OK"))) { // we haven't, so check it // CR: or we have and the host is ok, so check the file if ($debug) { echo "DEBUG: checking: proto=$proto, hostname=$hostname, ", "ip=$ip, port=$port...<br>"; } $fp = fsockopen($hostname, $port, &$errno, &$errstr, $timeout); if ($debug) { echo "DEBUG: connect result: fp=$fp, errno=$errno, errstr=$errstr<br>"; } if ($fp) { $sstatus = "OK"; fputs( $fp, sprintf( "GET %s HTTP/1.0\n\n", $url ) ); for( $try = 1; $try <= 3; $try++ ) { $fstatus = "CHECKING"; if( ($got = fgets( $fp, 256 )) == NULL ) break; if( eregi( "HTTP/1.(.) (.) (.)", $got, $parts ) ) { echo "<!-- Found on try $try -->"; if( $parts[2] == "200" ) $fstatus = "FOUND"; else if( $parts[2] == "300" ) $fstatus = "MOVED"; else if( $parts[2] == "403" ) $fstatus = "RESTRICTED"; else if( $parts[2] == "404" ) $fstatus = "NOT FOUND"; else $fstatus = "ERR ".$parts[2]." - ".$parts[3]; break; } $fstatus = "Bad Comms"; } } else { if (preg_match('/timed?[\- ]?out/i', $errstr)) { $sstatus = "TIMEOUT"; } elseif (preg_match('/refused/i', $errstr)) { $sstatus = "OFF"; } else { $sstatus = "DOWN?"; } } // cache this check $statuses[$key] = array($sstatus, $fstatus, $now); } } } echo "<A HREF=\"$url\">", ($text ? $text : htmlentities($url)), "</A>"; if ($sstatus) { echo " (S:$sstatus"; } / If the server is up, tell how the file is doing... */ if ($sstatus == "OK") { echo " F:$fstatus"; } else { echo ")"; } error_reporting($e); } ?>
This is a simple PHP code that lets you see if a link is valid before<br> displaying it on your Web page. It is useful since you can have live links,<br> but your site can become slow as the script checks the link before<br> displaying the link. Just imagine if you got 100 links to check. <? //idban secandri July 2000 please distribute is as GPL // //greeting as usual to desy, nadya, my friend at satunet group! $phpnet = fsockopen("www.php.net", 80, &$errno, &$errstr, 30); if(!$phpnet) { //change with your custom messages echo "<b>php.net <font color=\"red\">down!!</font></b>\n"; } else { echo("<a href=\"http://www.php.net\">php.net</a>"); } ?>
An enhanced form of <a href=http://php.klik.or.id/>Idban</a>'s <a href="http://www.zend.com/codex.php?id=201&single=1">valid link!</a>, a PHP script that lets you a test a link for the host's connectivity before displaying it. Enhancements include: cache in session and test for absolute/relative links. <p> Note that, despite its name, this script does <i>not</i> truely test whether a link is valid. A valid link should return a 200 HTTP status code, which this script does not test. What this script test is whether the web/FTP server of the link is reachable and listening (that is, from server that host the script to the link host, anyway, not from the viewer's computer to the link host :-p). But the script still could be somewhat useful to some of you, I guess. // 000712, steven@haryan.to /* an example of usage: <? require "/path/to/this/file"; ?> My validated bookmarks: <ul> <li><? disp_link("http://slashdot.org", "Slashdot"); ?> <li><? disp_link("http://www.zope.org", "Zope"); ?> <li><? disp_link("http://www.python.org", "Python"); ?> <li><? disp_link("http://www.perl.com", "Perl"); ?> <li><? disp_link("http://www.php.net", "Zend"); ?> <li><? disp_link("http://www.perl.com/CPAN-local/", ""); ?> </ul> btw, yup, of course this code is under GPL. / $debug = 0; $timeout = 30; // give up if can't connect within 30 secs. $check_freq = 560; // cache for 5 minutes. session_register('statuses'); session_register('hostnames'); function flush_disp_link_cache() { global $statuses; global $hostnames; $statuses = array(); $hostnames = array(); } function disp_link($url, $text) { global $debug; global $timeout; global $statuses; global $hostnames; global $check_freq; $now = time(); $e = error_reporting(); error_reporting($e & (255-E_WARNING)); if (!preg_match('/^(http\|https\|ftp):\/\/((?:\w+\.?)+):?(\d*)/', $url, $m)) { // it's a relative link, or absolute link with unsupported protocol // so there's no need to check $status = ''; if ($debug) { $status='DEBUG:UNCHECKED'; } } else { $proto=$m[1]; $hostname=strtolower($m[2]); $port=$m[3]; // is the host an IP address? if (preg_match('/^\d+\.\d+\.\d+\.\d+/', $hostname)) { $ip = $hostname; } else { // it's not, so we have to resolve it first // have we tried to resolve it not so long ago? $from_cache=0; if (isset($hostnames[$hostname])) { if ($debug) { echo "DEBUG: last resolve = ", $hostnames[$hostname][1], "<br>"; } if ($now - $hostnames[$hostname][1] <= $check_freq) { $ip = $hostnames[$hostname]; $from_cache=1; } } if (!$from_cache) { // we haven't, so resolve it $ip = gethostbyname($hostname); // if the hostname was not resolvable, gethostbyname returns // its argument unchanged if ($ip == $hostname) { $ip=''; } // cache this resolve $hostnames[$hostname]=array($ip,$now); } } if (!$ip) { // was the hostname unresolvable? $status = 'HOST NOT FOUND'; } else { // get universal port number defaults, if not specified if (!$port) { if ($proto == 'http') { $port = 80; } elseif ($proto == 'https') { $port = 443; } elseif ($proto == 'ftp') { $port = 21; } } $key = "$ip:$port"; // have we checked the site not so long ago? $from_cache=0; if (isset($statuses[$key])) { if ($debug) { echo "DEBUG: last check = ",$statuses[$key][1], "<br>"; } if ($now-$statuses[$key][1] <= $check_freq) { $status = $statuses[$key][0]; $from_cache=1; } } if (!$from_cache) { // we haven't, so check it if ($debug) { echo "DEBUG: checking: proto=$proto, hostname=$hostname, ", "ip=$ip, port=$port...<br>"; } $fp = fsockopen($hostname, $port, &$errno, &$errstr, $timeout); if ($debug) { echo "DEBUG: connect result: fp=$fp, errno=$errno, errstr=$errstr<br>"; } if ($fp) { $status = "OK"; } else { if (preg_match('/timed?[\- ]?out/i', $errstr)) { $status = "TIMEOUT"; } elseif (preg_match('/refused/i', $errstr)) { $status = "OFF"; } else { $status = "DOWN?"; } } // cache this check $statuses[$key] = array($status, $now); } } } echo "<A HREF=\"$url\">", ($text ? $text : htmlentities($url)), "</A>"; if ($status) { echo " ($status)"; } error_reporting($e); } ?>

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