File manipulation and automatic numbered file names
09-02-2007, 05:00 PM
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File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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Ok I am wondering how I can make automatic file names I don't think I am doing it correctly
If one file exist called 2.jpg then next file will be called 3.jpg then 4.jpg then 5.jpg and so on and so forth
How is this done I think it is
%d.jpg or something like this if I have a file that outputs jpgs how can I use this type of naming.
So HOW IS THIS DONE IN PHP?
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09-02-2007, 05:10 PM
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Re: File manipulation and automatic numbered file names
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Posts: 2,815
Name: Matt
Location: Irvine, CA
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If you are trying to access a list of numbered files systematically something like this will work:
PHP Code:
<?php
$files = 10 //the number of files you are accessing, ten in this case.
for($i = 0, $i < $files, $i++)
{
echo '<img src="images/' . $i . '.jpg">';
}
?>
not sure if that helps. |
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09-02-2007, 08:35 PM
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Re: File manipulation and automatic numbered file names
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Posts: 481
Location: Gold Coast - Brisbane QLD, Australia
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Using PHP5, scandir will return the file content in an array. You could then iterate through this array to find this highest number .jpg, then postincrement it, which gives you the final file name.
I wrote up a function that should work as above since I'll prolly wind up using it myself. Gimme a yell if something doesn't work as it's not tested:
PHP Code:
//Returns an autogenerated filename
//@$dir string path to directory for scanning
//@$format string file format minus full-stop
//Returns false on failure or new file name to use
function fctnFileAutoName($dir, $format = 'jpg') {
//return false if no dir path is passed
if(empty($dir)) return false;
//php5 only - return false now if php < 5
if(!function_exists(scandir)) return false;
$arr_fileNames = array();
//scandir to return array of file names
if ($arr_contents = scandir($dir)) {
//drop extension from filesnames and convert to integers
while ( false !== ( $file = readdir($arr_contents)) ) {
$fileName = explode('.', $file, 2);
if($fileName[1] == $format) {
$fileName = ( intval($fileName[0]) ) ? intval($fileName[0]) : NULL;
//add to new array
$arr_fileNames[] = $fileName;
}
}//end loop
//if no files that fit the integer naming scheme - return false
if (empty($arr_fileNames)) return false;
} else {
return false;
}
//iterate through and find the highest integer
$int_lastFile = 0;
foreach( $arr_fileNames as $value) {
//overwrite $int_lastFile if $value is larger
$int_lastFile = ( $value > $int_lastFile ) ? $value : $int_lastFile;
}
//post-increment $int_lastFile
$int_lastFile++;
//string together the autofilename
$str_autoFilename = $int_lastFile . '.' . $format;
//return the new filename
return $str_autoFilename;
}//EOF
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09-03-2007, 06:30 PM
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Re: File manipulation and automatic numbered file names
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Posts: 6,521
Name: Dan
Location: Swindon
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This look slike it could be useful. in the future...
__________________
Discounted Web Hosting With XDnet! >> Get 25% of hosting~ Promo: Webmaster-talk <<
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09-03-2007, 11:44 PM
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Re: File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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PHP Code:
<?php
$input = $_GET['input'];
$output = '%d'; //hopefully that will make the file name a number
exec 'ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -ar 22050 -ab 32 -f flv -s 320x240 /home/forbushj/public_html/2vidd/'.$output.'.flv';
exec 'ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -an -ss 00:00:45 -an -r 1 -vframes 1 -y -s 150x100 /home/forbushj/public_html/2vidd/'.$output.'.jpg';
?>
this is the code I am using this code for more than one thing I am doing |
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09-04-2007, 12:44 AM
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Re: File manipulation and automatic numbered file names
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Posts: 481
Location: Gold Coast - Brisbane QLD, Australia
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What are you using to arrive on this chunk of processing code? A link? An upload form?
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09-04-2007, 01:16 AM
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Re: File manipulation and automatic numbered file names
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Posts: 481
Location: Gold Coast - Brisbane QLD, Australia
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After seeing your post over at codingforums, I edited the above function to conform with the convention you mentioned over there. It will return a string 7 chars long, padded with 0's to the left
To make the function check for the next .jpg: fctnFileAutoName('/home/forbushj/public_html/2vidd/');
To make the function return the next .flv: fctnFileAutoName('/home/forbushj/public_html/2vidd/','flv');
PHP Code:
//Returns an autogenerated filename
//@$dir string path to directory for scanning
//@format string file format string minus full-stop
//Returns false on failure
function fileAutoname($dir, $format = 'jpg') {
//return false if no dir path is passed
if(empty($dir)) return false;
//php5 only - return false now if php < 5
if(!function_exists(scandir)) return false;
$arr_fileNames = array();
//scandir to return array of file names
if ($arr_contents = scandir($dir)) {
//drop extension from filesnames and convert to integers
while ( false !== ( $file = readdir($arr_contents)) ) {
$fileName = explode('.', $file, 2);
if($fileName[1] == $format) {
$fileName = ( intval($fileName[0]) ) ? intval($fileName[0]) : NULL;
//add to new array
$arr_fileNames[] = $fileName;
}
}//end loop
//if no files that fit the integer naming scheme - return false
if (empty($arr_fileNames)) return false;
} else {
return false;
}
//iterate through and find the highest integer
$int_lastFile = 0;
foreach( $arr_fileNames as $value) {
//overwrite $int_lastFile if $value is larger
$int_lastFile = ( $value > $int_lastFile ) ? $value : $int_lastFile;
}
//post-increment $int_lastFile
$int_lastFile++;
//string together the autofilename
$str_autoFilename = str_pad($int_lastFile, 7, '0', STR_PAD_LEFT);
//return the new filename
return $str_autoFilename;
}//EOF
Your usage would become:
PHP Code:
$input = ( !empty( $_GET['input'] ) && is_numeric( $_GET['input'] ) ) ? $_GET['input'] : false;
if( $input ) {
$outputJPG = fctnFileAutoName('/home/forbushj/public_html/2vidd/');
$outputFLV = fctnFileAutoName('/home/forbushj/public_html/2vidd/','flv');
if( $outputJPG && $outputFLV ) {
exec('ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -ar 22050 -ab 32 -f flv -s 320x240 /home/forbushj/public_html/2vidd/'.$outputFLV.'.flv');
exec('ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -an -ss 00:00:45 -an -r 1 -vframes 1 -y -s 150x100 /home/forbushj/public_html/2vidd/'.$outputJPG.'.jpg');
} else {
die('Error: Invalid input.');
}
} else {
die('Expecting a numeric value for GET[input].');
}
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09-04-2007, 09:42 PM
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Re: File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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Will this code work and I have to give the input as any type of media the output is what is different. either jpg or flv based on file name
Quote:
Originally Posted by metho
After seeing your post over at codingforums, I edited the above function to conform with the convention you mentioned over there. It will return a string 7 chars long, padded with 0's to the left
To make the function check for the next .jpg: fctnFileAutoName('/home/forbushj/public_html/2vidd/');
To make the function return the next .flv: fctnFileAutoName('/home/forbushj/public_html/2vidd/','flv');
PHP Code:
//Returns an autogenerated filename
//@$dir string path to directory for scanning
//@format string file format string minus full-stop
//Returns false on failure
function fileAutoname($dir, $format = 'jpg') {
//return false if no dir path is passed
if(empty($dir)) return false;
//php5 only - return false now if php < 5
if(!function_exists(scandir)) return false;
$arr_fileNames = array();
//scandir to return array of file names
if ($arr_contents = scandir($dir)) {
//drop extension from filesnames and convert to integers
while ( false !== ( $file = readdir($arr_contents)) ) {
$fileName = explode('.', $file, 2);
if($fileName[1] == $format) {
$fileName = ( intval($fileName[0]) ) ? intval($fileName[0]) : NULL;
//add to new array
$arr_fileNames[] = $fileName;
}
}//end loop
//if no files that fit the integer naming scheme - return false
if (empty($arr_fileNames)) return false;
} else {
return false;
}
//iterate through and find the highest integer
$int_lastFile = 0;
foreach( $arr_fileNames as $value) {
//overwrite $int_lastFile if $value is larger
$int_lastFile = ( $value > $int_lastFile ) ? $value : $int_lastFile;
}
//post-increment $int_lastFile
$int_lastFile++;
//string together the autofilename
$str_autoFilename = str_pad($int_lastFile, 7, '0', STR_PAD_LEFT);
//return the new filename
return $str_autoFilename;
}//EOF
Your usage would become:
PHP Code:
$input = ( !empty( $_GET['input'] ) && is_numeric( $_GET['input'] ) ) ? $_GET['input'] : false;
if( $input ) {
$outputJPG = fctnFileAutoName('/home/forbushj/public_html/2vidd/');
$outputFLV = fctnFileAutoName('/home/forbushj/public_html/2vidd/','flv');
if( $outputJPG && $outputFLV ) {
exec('ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -ar 22050 -ab 32 -f flv -s 320x240 /home/forbushj/public_html/2vidd/'.$outputFLV.'.flv');
exec('ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -an -ss 00:00:45 -an -r 1 -vframes 1 -y -s 150x100 /home/forbushj/public_html/2vidd/'.$outputJPG.'.jpg');
} else {
die('Error: Invalid input.');
}
} else {
die('Expecting a numeric value for GET[input].');
}
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09-04-2007, 10:38 PM
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Re: File manipulation and automatic numbered file names
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Posts: 481
Location: Gold Coast - Brisbane QLD, Australia
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Dunno m8, as mentioned it's untested. The function uses arguments for the directory path and format only. If successful, it will return the file name to use; that's it's only purpose. You just add the extension to the returned name;
Because you haven't posted anything in regards as to how this script is supposed to work (form, link etc) the function is generic. How you decide to use it is up to you.
Last edited by metho; 09-04-2007 at 10:43 PM..
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09-04-2007, 10:41 PM
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Re: File manipulation and automatic numbered file names
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Posts: 483
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Depending on how many files you are intending to have, I would suggest a different direction... not that the scandir won't work, but it will get slow inching your way through an array when you've got a few thousand files there.
If it were me, I'd basically do a binary search type approach.
So for example, imagine you currently have 1.jpg through to 45.jpg. Instead of doing scandir and iterating through the items, simply hit the file_exists function, testing an ever doubling number until the file doesn't exist, then continue to break down your search by half until you find the next file...
The steps would be:
- Does 1.jpg exist? Yes.
- Does 2.jpg exist? Yes.
- Does 4.jpg exist? Yes.
- Does 8.jpg exist? Yes.
- Does 16.jpg exist? Yes.
- Does 32.jpg exist? Yes.
- Does 64.jpg exist? No... now search from the middle point of 32 and 64, so...
- Does 48.jpg exist? No. Mid-point of 32 and 48...
- Does 40.jpg exist? Yes. Mid-point of 40 and 48...
- Does 44.jpg exist? Yes. Mid-point of 44 and 48...
- Does 46.jpg exist? No. Mid-point of 44 and 46...
- Does 45.jpg exist? Yes.
46.jpg doesn't exist but 45.jpg does exist... therefore your next image number is 46.jpg.
This may seem convoluted but as you can see, there were only 12 attempts at getting a number. If my math is correct, even just 30 attempts will let you find the next number up to over a billion...
Hopefully this process makes sense!
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09-04-2007, 11:09 PM
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Re: File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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By the way the commands demonstrated in exec function uses ffmpeg
PHP Code:
<?php //first one gets input from a form which runs with ffmpeg then it does sampling rate at //22050HZ audio bitrate is 32 forced to flv size is 320x240 and then the output
exec 'ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -ar 22050 -ab 32 -f flv -s 320x240 /home/forbushj/public_html/2vidd/'.$output.'.flv';
//next gets input from form and takes a thumbnail frame at 45 seconds and saves it as a jpg
exec 'ffmpeg -i /home/forbushj/public_html/uploadvidd/'.$input.' -an -ss 00:00:45 -an -r 1 -vframes 1 -y -s 150x100 /home/forbushj/public_html/2vidd/'.$output.'.jpg'; ?>
Cool can you demonstrate this with 0000001 - 9999999 how this would be done.
Quote:
Originally Posted by TwistMyArm
Depending on how many files you are intending to have, I would suggest a different direction... not that the scandir won't work, but it will get slow inching your way through an array when you've got a few thousand files there.
If it were me, I'd basically do a binary search type approach.
So for example, imagine you currently have 1.jpg through to 45.jpg. Instead of doing scandir and iterating through the items, simply hit the file_exists function, testing an ever doubling number until the file doesn't exist, then continue to break down your search by half until you find the next file...
The steps would be:
- Does 1.jpg exist? Yes.
- Does 2.jpg exist? Yes.
- Does 4.jpg exist? Yes.
- Does 8.jpg exist? Yes.
- Does 16.jpg exist? Yes.
- Does 32.jpg exist? Yes.
- Does 64.jpg exist? No... now search from the middle point of 32 and 64, so...
- Does 48.jpg exist? No. Mid-point of 32 and 48...
- Does 40.jpg exist? Yes. Mid-point of 40 and 48...
- Does 44.jpg exist? Yes. Mid-point of 44 and 48...
- Does 46.jpg exist? No. Mid-point of 44 and 46...
- Does 45.jpg exist? Yes.
46.jpg doesn't exist but 45.jpg does exist... therefore your next image number is 46.jpg.
This may seem convoluted but as you can see, there were only 12 attempts at getting a number. If my math is correct, even just 30 attempts will let you find the next number up to over a billion...
Hopefully this process makes sense!
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Last edited by goheadtry; 09-04-2007 at 11:17 PM..
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09-05-2007, 01:15 AM
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Re: File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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If you have a better way of doing this let me know
this is how I am probably going to do it unless someone knows of a better way
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09-05-2007, 08:02 AM
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Re: File manipulation and automatic numbered file names
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Posts: 483
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To be perfectly honest, the code that I would be writing would be untested and would still need to be tweaked for your situation.
Instead, I'd suggest doing a search for 'binary search' (Wikipedia or something like that probably has an implementation) and then tweak *that* code, knowing that it's right to begin with.
When you're looking at it, you'll find that binary search code is normally looking for a value: in your instance that 'value' would be "file-(n-1).jpg exists but file-(n).jpg does not exist".
It should be pretty simple.
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09-08-2007, 10:18 PM
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Re: File manipulation and automatic numbered file names
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Posts: 730
Name: John
Location: United States of America, California
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I found a good alternative method
http://www.howtoforge.com/video_stre...tpd_flowplayer
Not exactly for what I need but it has source code that I can use. |
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