Forums » Scripts »» how to display show get file extension getting uploaded file extension type

Fri Feb 29, 2008 12:01 pm - how to display show get file extension getting uploaded file extension type

#1854

how to display show get file extension getting uploaded file extension type

like many websites, they offer their visitors to upload files such as images, photos, zip, documents, text, and more, its important to know what type of files you are allowing your visitors to upload to your site. for example, if i have a form for a user to upload an image file, i should have my script check to make sure its an image file and not a file that can harm your server.

so to get the file extension i can use the substr() strrpos() PHP functions to be able to get the type of file a user is uploading..

lets say the file name is called wallpaperama.jpg so this is how i would declare the value of my string:

$fileName = 'wallpaperama.jpg';

then i want to find out what are the characters after the . (dot) with this code:

$ext = substr($fileName, strrpos($fileName, '.') + 1);

and this is the complete script:

<?
$fileName = 'wallpaperama.jpg';
$ext = substr($fileName, strrpos($fileName, '.') + 1);
echo 'The file extension is: .'.$ext;
?>

to see the script in action all you have to do is copy and paste the complete code above to a text editor like notepad and save it as wallpaperama.com and upload to your website, then open it with your browser. NOTE: your website must have PHP, if your website doesn't have PHP, go to www.webune.com to sign up for PHP webshosting.

COURTESY: this tutorial guide was brought to you by www.webune.com

author: web hosting

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Sun Jul 15, 2007 5:18 pm - Re: how to display show get file extension getting uploaded file extension type

#2078

maca

thanks, this was good to know how to remove the file extension on a string i was working on.

Sun Jul 15, 2007 5:29 pm - Re: how to display show get file extension getting uploaded file extension type

#2079

webune

another way to do this, i use this php code:

PHP CODE:

$filename = 'wallpaperama.jpg';
preg_match('/.([A-Za-z]+?)$/', $filename, $matches);
echo "The file exension for $filename is: ".$matches[1]."
and with the dot is ".$matches[0]."";
?>

OUTPUT:

The file exension for wallpaperama.jpg is: jpg
and with the dot is .jpg

courtesy: Webune hosting

Sun Jul 15, 2007 5:41 pm - Re: how to display show get file extension getting uploaded file extension type

#2080

hostman

that was a good one, and another way is to split the file name and the file extension into an array with this function:

function findexts ($filename)
{
$filename = strtolower($filename) ;
$exts = split("[/\.]", $filename) ;
$n = count($exts)-1;
$exts = $exts[$n];
return $exts;
}
$filename = 'wallpaperama.jpg';
echo '

'.findexts ($filename).'

';
?>

OUTPUT:

The File Extension is: jpg

anyone else has a way to display the file name and the extension into an array?

Sun Jul 15, 2007 6:00 pm - Re: how to display show get file extension getting uploaded file extension type

#2081

maca

i would like to learn that, you know, split the file into the filne name and the file extension into two separate string, well, i was able to figure out how to get the file name and remove the extension from the file name with this fucntion:

I use this function to remove the file extension and display only the file name without the extension of the file name: this is good when you have users upload files and you can rename the to whatever you want and then display them on the website with the new name:

<?
function remove_ext($filename) {
$extension = strrchr($filename, '.');
if($extension !== false){
$filename = substr($filename, 0, -strlen($extension));
}
return $filename;
}
$filename = 'wallpaperama.jpg';
echo remove_ext($filename);
?>

OUTPUT:

The file name without extension is: wallpaperama

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