parsing string and extracting

gte806e

I want to parse:

$imgName = "22556.jpg";

I want to just extract the 22556 from $imageName and save it as $imageNum.

I've searched through the various string functions and cant seem to find one that I exactly need...

Help.

BuzzLY

list($imageNum, $fileext) = split($imgname, ".");

Tekron-X

use the regular expression [0-9] if u need an example let me know.

gte806e

Thanks for replies,

I decided to do this

$imageName = "334455.jpg";
$imageNumger = explode(".", $imageName);

does this seem the most efficient way?

I coudlnt find a string function that would just truncate all the info from the . on.

Jesse

BuzzLY

If by most efficient, you mean reducing the number of lines in your code, then no, using the method I gave you is the most efficient. For example, $imgname = 123456.jpg:

list($imageNum, $fileext) = split($imgname, ".");

now you can access $imageNum, which contains "123456" -- this is the value you wanted, right?

I want to just extract the 22556 from $imageName and save it as $imageNum.

Yes, you can use regular expressions, and you can explode $imgname and use the first value in the subsequent array. But if all you wanted was to return the image number, my method should work for you. My method has the added bonus of giving you access to the file extension as well, should you need it. In this example, $fileext contains "jpg".

Tekron-X

That is what the Regexp does it only stores the numbers in the variable.


$imageNumber = ereg("^[0-9]+$", $imageName, $Trash);

BuzzLY

Tektron, you are correct, and it's a good method. However, if anything should change, it won't work any more. For example, they might decide to use it for more than just images -- which could then include file extensions that contain numbers. Plus, they might decide to use alpha-numeric filenames at some point, and your regexp won't work.

But, for what he asked for, yours works quite nicely, too 🙂

Tekron-X

Well you can alwayse make a slight change to the regexp with
alpha-numeric but then to come and thing of it, it just might get really complicated with regexp the more specific you need to get lol.

BuzzLY

I think this is just one more example that there is more than one way to skin a cat 🙂

gte806e

Thanks everyone!

Buzz, yeah i seen your list I just hadn't had experince using it and didnt have time to look it up. But ill give it a look and make the change.

Thanks again

Jesse

xblue

buzzly, why would you use split instead of explode?
I don't think that is any need for a regular expression function like split here, and splitting on a dot without escaping it (i.e. the dot meaning just any character) doesn't seem a good idea to me either ...
😕