Trim the text "th_" from variable and save the result to a new variable?

Question

My question is quick and simple.

I am creating a gallery and I am fetching my full-size images and my thumbnails from a directory using glob.

I have a variable for the path to my thumbnail images : images/photo-strip/thumb/*.jpg

I am reducing the path images/photo-strip/thumb/*.jpg to *.jpg using basename() and I save that to $filename

Then I re-build the path to the full size image like this: $pathToFull = 'images/photo-strip/' . $filename;

My files inside the thumb folder are named like so: th_*.jpg and the full size images are *.jpg (exactly matching but without the th).

I then have an echo that puts the HTML, with thumbnail path in an <img> tag and fullsize path to an <a> tag.

Problem is the path to my full-size images is wrong because of the th_ in the filenames of the images.

Is there a way to trim the th_ from $filename and save it to something like $full_filename so I can correct the filename for the full-size images?

I could easily rename the thumbnail images to exclude th_ and this would solve my problem but I would prefer to leave the file names as is.

EDIT:

I am using BCMCFC's method as it get's rid of two lines of code that I don't neccessarily have to have.

Thanks for the speedy answers!

score 1 · Answer 1 · answered Apr 02 '13 at 15:42

1

Just use the str_replace function to replace "th_" by empty string

answered Apr 02 '13 at 15:42

Laurent S.

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This is what I ended up using but to some further extent as shown in bcmcfc's answer. +1 and thanks! – Michael Apr 02 '13 at 15:57

score 1 · Answer 2 · answered Apr 02 '13 at 15:42

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Look no further than $full_filename = substr($filename,3);

answered Apr 02 '13 at 15:42

Niet the Dark Absol

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Great answer and it works but I like bcmcfc's answer better. It allows me to cut out two lines of code. Thanks though!! – Michael Apr 02 '13 at 15:54

score 1 · Accepted Answer · answered Apr 02 '13 at 15:44

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Instead of rebuilding the path, it sounds like you could simplify the process as follows:

$img = str_replace('images/photo-strip/thumb/th_', 'images/photo-strip/', $originalImage);

Or just:

$img = str_replace('thumb/th_', '', $originalImage);

answered Apr 02 '13 at 15:44

bcmcfc

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This is very nice, it allows me to skip using basename to find the filename and allows me to cut out the line that I had "rebuilding" the filepath. – Michael Apr 02 '13 at 15:52

score 1 · Answer 4 · answered Apr 02 '13 at 15:52

1

This would be the most elegant way to do it:-

$filename = 'th_myimage.jpg';
$pathToFull = 'images/photo-strip/' . preg_replace('/^(th_)?/', '', $filename);
// $filename would be 'myimage.jpg'

This regular expression pattern would replace only the first occurrence of th_ and if it was at the start of the string.

answered Apr 02 '13 at 15:52

Suleman C

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+1 for a very good answer. I am using bcmcfc's answer as it cuts down on the amount of code needed to achieve what I want. I would use this if it weren't for not being worried about other occurences of th_ later in the filename. I very specific with my naming conventions so there is no need to be worried about that happening. Thanks! – Michael Apr 02 '13 at 15:56

score 0 · Answer 5 · edited May 23 '17 at 12:03

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This has an implementation for batch renaming files in a directory.

Bulk Rename Files in a Folder - PHP

edited May 23 '17 at 12:03

Community

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answered Apr 02 '13 at 15:45

wazy

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score 0 · Answer 6 · answered Apr 02 '13 at 15:50

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You could use "explode" to split the string on the "_" character to an array, then get the latter element of the array.

$myarray = explode("_", $filename);
if(count($myarray)>1){
    $full_filename = $myarray[1];
}

answered Apr 02 '13 at 15:50

Crwydryn

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Trim the text "th_" from variable and save the result to a new variable?

6 Answers6