PHP: How to generate indexed name with string in file output? - php

Question

Actually I'm using uniqid(); to generate random names:
$file = UPLOAD_DIR . uniqid() . '.png';
The output looks like:
53bd02cdc6b9b.png
53bd02cdc6bd8.png
53bd0320aafbc.png
53bd0320aaff7.png
53bd03e89b8df.png
I want to change these names each file as output:
picture_0001.png
picture_0002.png
picture_0003.png
picture_0004.png
picture_0005.png
Do you have better ideas?

Answer 1

Your want to fix all your current images to the correct format (See # Félix Gagnon-Grenier answer), then once you done that you can do something like the following:
//get array of current images
$imgs = glob(UPLOAD_DIR.'*.png');
//select last image in array, strip out all non-alpha's then pad it with 4 0's
$next = str_pad(preg_replace("/[^0-9]/","", end($imgs))+1, 4, "0", STR_PAD_LEFT);
$file = UPLOAD_DIR.'picture_'.$next.'.png';
Edit
See comments - file based counter
$count_file = UPLOAD_DIR.'count.txt'; //or put somewhere else
//make count file if not exists
if(!file_exists($count_file)){
file_put_contents($count_file,0);
}
//get last image count + 1
$next = file_get_contents($count_file)+1;
//set file var
$file = UPLOAD_DIR.'picture_'.sprintf("%04s",$next).'.png';
//update counter
file_put_contents($count_file, $next);

Answer 2

well, since it hurts your feeling, you seem to be a human being, and I care for human beings. there you go:
I don't know any context, so this may be wildly far from what you actually need.
say your directory is /home/dir
$i = 1;
foreach (scandir('/home/dir') as $file)
{if ($file == '.' || $file == '..') continue;
rename($file,'picture_' . str_pad($i,4,'0',STR_PAD_LEFT) . '.png');
$i++;}
this will generate:
picture_0001.png
picture_0002.png
picture_0003.png
picture_0004.png
picture_0005.png
in place of your old files