extract file extension

[mpsn]

Hi, how do I extract just file extension?

 

eg:

$file="hello.xml";

 

$fileExt=???

 

print $fileExt;

 

Any help much appreciated!

[QuickOldCar]

<?php
$file="hello.xml";

$fileExt = end(explode(".",$file));

echo $fileExt;

?>

[mpsn]

Thanks, I also found this useful tidbit:

 

$dir=pathinfo("C:\dir\dir2\hello.xml");

print $dir["extension"];

[Fadion]

As you found out, using pathinfo() is much simpler than a mix of string or vector manipulation functions. It will also be a tad faster, because it uses the internal engine directly.

 

Anyway, you can also find the extension by passing an "options" parameter to pathinfo(), which should be simpler than accessing the vector's key.

 

<?php
$file = 'hello.xml';
$ext = pathinfo($file, PATHINFO_EXTENSION);

echo $ext; //will output "xml"
?>

[mpsn]

Appreciate the constant as second parameter, but what do you mean it is a "tad faster because it uses internal engine", isnt' even php core string manipulation function also part of the internal engine, are you talking about the Zend engine?

[Fadion]

Every PHP function runs by the Zend Engine (internal engine, PHP engine, whatever suits it). My point was that with pathinfo() you run a single PHP function which is interpreted by the Zend Engine and some C code is executed to get the file extension. By using a mix of string or vector manipulation functions, you run 2 or 3 functions which are also interpreted by the engine. The later will normally be slower (even if for not really significant values), because it triggers a greater part of C code in the engine. Usually, achieving something with native functions is faster than with a group of functions not really related to the subject.

 

I think I complicated this more than it really is