is_file() or file_exists() – URL

@tripwaterJun 10.2005

Hello

Here is what I am trying to do. I have a directory on my server that holds modules for download. Users can upload modules to this dir.

Now I query my DB for all of the Module names and list them out. Now it is possible that a old module is still in the DB but the actual file is not in the modules directory. So if it is not in the directory, I jsut want to show the name, otherwise I want to show a link so they can download the latest module.

Here is some basic code:

[code] //here I query for the URL of the site from the company table in order to put it in the download URL

$query = “select URL from company”;

$tempresult = @mysql_query($query);

$temprow = @mysql_fetch_array($tempresult);

for ($i = 0; $i < @mysql_num_rows($result); $i++) { $row = @mysql_fetch_array($result);

$file = $temprow[“URL”].”/modules/”.$row[“ModuleName”];

$value .= “<tr> <td width=300>”;

//here I check to see if the file exists in the dir. If not then I do not show a link //to download it

if (!is_file($file)) $value .= $row[“ModuleName”].” (File Missing).”; else $value .= “<a href=””.$file.””>”.$row[“ModuleName”].”</a>”;

$value .= “</td> <td width=300> “.$row[“Version”].” </td> <td> “.$row[“LastChangeDate”].” </td> </tr>”; } [/code]

As of right now if I use either is_file() or file_exists() and pass in $file, everything is normal text not a link. I know for a fact most of these are in the dir. I just know that I am doing something wrong. Can you not pass in the full URL to a file into one of these functions? If not, then how do I determine if the file does in fact exist at this location?

Thank you for any help with this.

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PHP

4 Comments(s) _↴

@ShrineDesignsJun 10.2005 — #yes and no, file_exists(): php 3/4 you can't use a url, php 5 you can

there are several methods i have used to check if a link is valid, apache_lookup_uir(), example

[code=php]function lookup_uri($uri)
 {
 $status = array
 (
 100 => 'Continue',
 101 => 'Switching Protocols',
 200 => 'OK',
 201 => 'Created',
 202 => 'Accepted',
 203 => 'Non-Authoritative Information',
 204 => 'No Content',
 205 => 'Reset Content',
 206 => 'Partial Content',
 300 => 'Multiple Choices',
 301 => 'Moved Permanently',
 302 => 'Found',
 303 => 'Other',
 304 => 'Not Modified',
 305 => 'Use Proxy',
 307 => 'Temporary Redirect',
 400 => 'Bad Request',
 401 => 'Unauthorized',
 402 => 'Payment Required',
 403 => 'Forbidden',
 404 => 'Not Found',
 405 => 'Method Not Allowed',
 406 => 'Not Acceptable',
 407 => 'Proxy Authentication Required',
 408 => 'Request Timeout',
 409 => 'Conflict',
 410 => 'Gone',
 411 => 'Length Required',
 412 => 'Precondition Failed',
 413 => 'Request Entity Too Large',
 414 => 'Request-URI Too Long',
 415 => 'Unsupported Media Type',
 416 => 'Requested Range Not Satisfiable',
 417 => 'Expectation Failed',
 500 => 'Internal Server Error',
 501 => 'Not Implemented',
 502 => 'Bad Gateway',
 503 => 'Service Unavailable',
 504 => 'Gateway Timeout',
 505 => 'HTTP Version Not Supported'
 );
 if(strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') !== false && strpos($_SERVER['SERVER_SOFTWARE'], 'Win32') === false)
 {
 $info = apache_lookup_uri($uri);
 return array($info->status, $status[$info->status]);
 }
 if(($fp = @fopen($uri, 'rb')) !== false)
 {
 socket_set_timeout($fp, 0, 0);
 $status = socket_get_status($fp);
 fclose($fp);
 list(, $sc, $sm) = explode(' ', $status['wrapper_data'][0], 3);
 return array($sc, $sm);
 }
 return false;
 }[/code]

though experience that this is has a lot of overhead and slows a script down dispite try everything to speed it up, this is my latest variation

[code=php]function lookup($uri)
 {
 $status = array
 (
 100 => 'Continue', 101 => 'Switching Protocols',
 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content',
 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect',
 400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Timeout', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Long', 415 => 'Unsupported Media Type', 416 => 'Requested Range Not Satisfiable', 417 => 'Expectation Failed',
 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Timeout', 505 => 'HTTP Version Not Supported'
 );
 $u = parse_url($uri);
 
  if(!isset($u['path']))
  {
   $u['path'] = '/';
  }
  if(!isset($u['port']))
  {
   $u['port'] = getservbyname('www', 'tcp');
  }
  $addr = gethostbyname($u['domain']);
  $sp = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
 
  if(!$sp)
  {
   return false;
  }
  socket_set_timeout($sp, 0, 0);
  $result = @socket_connect($sp, $addr, $u['port']);
 
  if(!$result)
  {
   return false;
  }
  $in = "HEAD {$u['path']} HTTP/1.1rnHost: {$u['domain']}rnConnection: Closernrn";
  socket_write($sp, $in, strlen($in));
  $out = socket_read($sp, 1024);
  socket_close($sp);
  $out = explode("rn", $out, 2);
  unset($out[1]);
  $out = explode(" ", $out[0]);
  return array($out[1], $status[$out[1]]);
 }[/code]

i haven't tested this much, but is showing signs of vast improvement over the other one

returned value is an array index 0 is the status code, and index 1 is the status message, anything 400 and over basically says the uri doesn't exist or false if the connection failed

@tripwaterauthorJun 10.2005 — #WOW. Thanks for the response.

I don't need to see if a link is valid. I need to see if the file actually exists on the server in the designated directory. If it does then I show a link to download it if not then I show the name of the file with (file missing) beside it.

Is this not possible?

I thought for sure that file_exists() would be my answer but I cannot get it to work passing in the full path to the file.

Thanks again

@ShrineDesignsJun 12.2005 — #the function i post will tell you if the file exists or not, example

[code=php]<?php
 $status = lookup('http://www.domain.com/path/to/file');
 
 if(!$status)
 {
 echo "failed to connect to website";
 }
 else if($status[0] >= 400)
 {
 echo "file does not exist on that website or is not accessible";
 }
 else
 {
 echo "all is good";
 }
 ?>[/code]

@SpectreReturnsJun 12.2005 — #If you are trying to figure out if somethign on the same server exists, make sure you have a path for file_exists.

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