seperate file extension from file name

[ted_chou12]

i believe someone posted this already, but i cant seem to find it, if not, can anyone tell me how to separate file extension from file name, (i want the file extension).
Thanks
Ted

[The Little Guy]

I think that was me that posted it, but anyways here is what I came up with:
[code]
<?php
function getext($filename) {
$pos = strrpos($filename,'.');
$str = substr($filename, $pos);
return $str;
}
echo getext("thisismyfile.html");
?>[/code]

[ted_chou12]

sorry, but can you explain which one gives you the file extension?
thankyou
Ted.

[ted_chou12]

nope, i dont think this getext() works, i cant find it on php manual as well. :'(
Ted

[craygo]

[code]$ext = strrchr($filename,'.');[/code]

Ray

[ted_chou12]

thanks.

[The Little Guy]

the getext isn't in the manual, because it is a function that I created, it works for me thouhgh, but maybe it did something that you didn't want, idk.

[ted_chou12]

but why cant i get it to work on here? it just doent show up anything at all!
[code]
$dir = "homework/";

// Open the directory
$dh = opendir($dir);
while (($file = readdir($dh)) !== false){

$ext = strrchr($filename,'.');//here i want to know if it is txt file or not, if not, i dont want to get it to read.
if ($ext == ".txt") {
  $fullfile = $dir . $file;
  $subtotals[] = file_get_contents($fullfile);
}}

// Add them all together
$total = 0;
foreach ($subtotals as $st){
  $total = $total + $st;
}

// Echo the total
echo "$total\n";
[/code]

oh, so you have 'function' at the front..., but i dont know why it doesnt work for me, still, a big thanks to TLG.

[The Little Guy]

Give this a try.
[code]
<?php
function getext($filename) {
$pos = strrpos($filename,'.');
$str = substr($filename, $pos);
return $str;
}
$dir = "homework/";

// Open the directory
$dh = opendir($dir);
while (($file = readdir($dh)) !== false){

$ext = getext($filename);//here i want to know if it is txt file or not, if not, i dont want to get it to read.
echo "$ext";
if ($ext == ".txt") {
  $fullfile = $dir . $file;
  $subtotals[] = file_get_contents($fullfile);
}}

// Add them all together
$total = 0;
foreach ($subtotals as $st){
  $total = $total + $st;
}

// Echo the total
echo "$total\n";
?>[/code]

[ted_chou12]

nope, i tried it, and it returns me 0, which is not the real figure.

[The Little Guy]

it doesn't look like you are defining $filename.

[ted_chou12]

hey sorry, my mistake, the filename is "topic101-replies.php" however, the number "101" in which may variey. What i want is that the function recognizes this format of file name, you understand me?

[The Little Guy]

This:
[code]<?php
function getext($file) {
$pos = strrpos($file,'.');
$str = substr($file, $pos);
return $str;
}
$dir = "homework/";
$filename = "topic101-replies.php";    #This is where you will change the name of the file.
// Open the directory
$dh = opendir($dir);
while (($file = readdir($dh)) !== false){

$ext = getext($filename);//here i want to know if it is txt file or not, if not, i dont want to get it to read.
echo "$ext";
if ($ext == ".txt") {
  $fullfile = $dir . $file;
  $subtotals[] = file_get_contents($fullfile);
}}

// Add them all together
$total = 0;
foreach ($subtotals as $st){
  $total = $total + $st;
}

// Echo the total
echo "$total\n";
?>[/code]

[ted_chou12]

nope this time it truely returns 0.
here, i will give you examples:
topic1-replies.php
topic2-replies.php
topic3-replies.php
...
topic99-replies.php
topic100-replies.php
...
topic999-replies.php
topic1000-replies.php
...
goes on forever......
but whatever the number is, i want it to recognize as "topic"..."-replies.php"
yeah.
fully understood?
if not, i will further explain...
Ted

[craygo]

need to change $filename to $file
[code]<?php
$dir = "homework/";

// Open the directory
$dh = opendir($dir);
while (($file = readdir($dh)) !== false){

$ext = strrchr($file,'.');//here i want to know if it is txt file or not, if not, i dont want to get it to read.
if ($ext == ".txt") {
  $fullfile = $dir . $file;
  $subtotals[] = file_get_contents($fullfile);
}}

// Add them all together
$total = 0;
foreach ($subtotals as $st){
  $total = $total + $st;
}

// Echo the total
echo "$total\n";
?>[/code]

[The Little Guy]

so what your saying is you don't want the file extension, you want the number within the filename.

[ted_chou12]

um... I want the function to be able to recognize the format of the filename, not the extension,(sorry it was my bad at first), so that it only sees the replies counter files.

[ted_chou12]

nevermind, thanks for all of you, I was being clever, give the counter files a new extension, dont bother with the filename format and stuff, they are just too complictated, sometimes we have to think smarter, dont we? ;D
T.T.