PHP- Check If File Exists On Different Domain

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PHP- Check If File Exists On Different Domain
Maruf
Nov 20th, 2008
Maruf scribbled this post.

Earlier today I needed to find out if a file exists on a different domain. Initially I used the file_exists function, but then when that threw back an error I remembered that file_exists only checks whether a file or directory exists on the same server as the script.

After I played around with various functions, I came up with a few lines of code that actually works:

How to check if file exists on a different domain

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<?
$image = "http://www.example.co.uk/images/1.jpg";
$handle = @fopen("$image", "r");
if(strpos($handle, "Resource id") !== false)
{
echo "file does exist";
}
else
{
echo "file does not exist";
}
?>

The logic explained

Ok, so if the file exists (1.jpg) the fopen function will throw back a “resource id” response. So I check the response to see if “response id” exists with the strpos function. It’s really as simple as that.

I’m not entirely sure if my method is the best, nor the most efficient, but it seems to work pretty well, and I can’t think of any other methods. Anyone know of any other/better methods?

Better solution

Thanks to a comment left by Paul I’ve been made aware of a better solution.

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$url = "http://www.example.com/index.php";
$header_response = get_headers($url, 1);
if ( strpos( $header_response[0], "404" ) !== false )
{
  // FILE DOES NOT EXIST
} 
else 
{
  // FILE EXISTS!!
}

Filed away: PHP

comments

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1

Nice. Cheers!

Ian
Mar 14th, 2009
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2

Couldn’t you just put the @fopen directly into the if expression? If it returns a resource it will be TRUE, if not it will be FALSE. Forget the strpos()

Blake
Jul 22nd, 2009
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3

nice post. it was helpful.

learner
Aug 27th, 2009
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4

file_get_contents(“http://example.com/path/to/image.gif”,0,null,0,1) is a much better solution!

Steve
May 16th, 2010
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5

You only need to examine the headers – don’t need the whole file such as in file_get_contents…

$arrHeader = get_headers($url, 1);
if ( strpos( $arrHeader[0], ’404′ ) !== false ){
//Got it!
} else {
Not so much!
}

Paul
Jun 28th, 2010
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6

Hey Paul,

Many thanks, that’s a great solution! I will update this post later :)

Learn something new every day…

Maruf
Jun 28th, 2010

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