Get highest numbered file and create next one - php

Question

I have a folder that contains files named standard_xx.jpg (xx being a number)
I would like to find the highest number so that I can get the filename ready to rename the next file being uploaded.
Eg. if the highest number is standard_12.jpg
$newfilename = standard_13.jpg
I have created a method to do it by just exploding the file name but it isn't very elegant
$files = glob($uploaddir.'test-xrays-del/standard_*.JPG');
$maxfile = $files[count($files)-1];
$explode = explode('_',$maxfile);
$filename = $explode[1];
$explode2 = explode('.',$filename);
$number = $explode2[0];
$newnumber = $number + 1;
$standard = 'test-xrays-del/standard_'.$newnumber.'.JPG';
echo $newfile;
Is there a more efficient or elegant way of doing this?

Answer 1

I'd do it like this myself:
<?php
$files = glob($uploaddir.'test-xrays-del/standard_*.JPG');
natsort($files);
preg_match('!standard_(\d+)!', end($files), $matches);
$newfile = 'standard_' . ($matches[1] + 1) . '.JPG';
echo $newfile;

Answer 2

You can make use of sscanfDocs:
$success = sscanf($maxfile, 'standard_%d.JPG', $number);
It will allow you to not only pick out the number (and only the number) but also whether or not this worked ($success).
Additionally you could also take a look into natsortDocs to actually sort the array you get back for the highest natural number.
A complete code-example making use of these:
$mask = 'standard_%s.JPG';
$prefix = 'test-xrays-del';
$glob = sprintf("%s%s/%s", $uploaddir, $prefix, sprintf($mask, '*'));
$files = glob($glob);
if (!$files) {
throw new RuntimeException('No files found or error with ' . $glob);
}
natsort($files);
$maxfile = end($files);
$success = sscanf($maxfile, sprintf($mask, '%d'), $number);
if (!$success) {
throw new RuntimeException('Unable to obtain number from: ', $maxfile);
}
$newnumber = $number + 1;
$newfile = sprintf("%s/%s", $prefix, sprintf($mask, $newnumber));

Answer 3

Try with:
$files = glob($uploaddir.'test-xrays-del/standard_*.JPG');
natsort($files);
$highest = array_pop($files);
Then get it's number with regex and increase value.

Answer 4

Something like this:
function getMaxFileID($path) {
$files = new DirectoryIterator($path);
$filtered = new RegexIterator($files, '/^.+\.jpg$/i');
$maxFileID = 0;
foreach ($filtered as $fileInfo) {
$thisFileID = (int)preg_replace('/.*?_/',$fileInfo->getFilename());
if($thisFileID > $maxFileID) { $maxFileID = $thisFileID;}
}
return $maxFileID;
}