'how to validate file_get_contents()?

I have a file in my site, ex: http://example.com/name.txt

I would like to check if this file exists inside a function, so I did this

<?php

function checkFile($fileUrl){
   if(!is_file($fileUrl) || !is_readable($fileUrl)){
    return 'This is not valid file';
   }

}

Since checkFile('http://example.com/name.txt'); said it could not file the file, I tried to also check using this method. 

function checkFile($fileUrl){
       $file = file_get_contents($fileUrl); 
       if(empty){
         return 'File not found or empty';
       }
    }

But both approach are giving me errors static that the file is not found. I am sure the file is there, so how can I actually check if files exists in online?

phpfile-iofile-get-contents


Solution 1:[1]

Alternatively you can check response headers from server if 404 then file doesn't exist using function

get_headers()

http://us1.php.net/manual/en/function.get-headers.php

$file = 'http://www.domain.com/somefile.jpg';
$file_headers = @get_headers($file);
if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
    $exists = false;
}
else {
    $exists = true;
}

Solution 2:[2]

function checkFile($fileUrl) {
    if (!file_exists($fileUrl)) {
        return 'This file is not a valid file.';
    }
}

Side Note This is only valid as of PHP 5 http://us1.php.net/manual/en/function.file-exists.php

Solution 3:[3]

Could you try this?

# run this for 
$mime = image_type_to_mime_type(exif_imagetype($url));
$extension = self::mime2ext($mime);

Then use this Github mime2ext function to determine if a valid file is found (or the file you're expecting).

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Abhishek
Solution 2 Rottingham
Solution 3 Adam

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