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php – How to check if a file exist on an external server

Posted by: admin July 12, 2020 Leave a comment

Questions:

How to check if a file exist on an External Server? I have a url “http://logs.com/logs/log.csv” and I have an script on another server to check if this file exists. I tried

$handle = fopen("http://logs.com/logs/log.csv","r");
if($handle === true){
return true;
}else{
return false;
}

and

if(file_exists("http://logs.com/logs/log.csv")){
return true;
}else{
return false;
}

These methos just do not work

How to&Answers:
  1. Make sure error reporting is on.

  2. Use if($handle)

  3. Check allow_url_fopen is true.

  4. If none of this works, use this method on the file_exists page.

Answer:

function checkExternalFile($url)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_exec($ch);
    $retCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return $retCode;
}

$fileExists = checkExternalFile("http://example.com/your/url/here.jpg");

// $fileExists > 400 = not found
// $fileExists = 200 = found.

Answer:

This should work:

$contents = file_get_contents("http://logs.com/logs/log.csv");

if (strlen($contents))
{
  return true; // yes it does exist
}
else
{
  return false; // oops
}

Note: This assumes file is not empty

Answer:

  <?php
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 4file dir);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_MAXREDIRS, 10);

    $data = curl_exec($ch);
    curl_close($ch);

    preg_match_all("/HTTP\/1\.[1|0]\s(\d{3})/",$data,$matches); //check for HTTP headers

    $code = end($matches[1]);

    if(!$data) 
    {
        echo "file could not be found";
    } 
    else 
    {
        if($code == 200) 
        {
            echo "file found";
        } 
        elseif($code == 404) 
        {
            echo "file not found";
        }
    }
  ?>