Php creating temporary file

Creating A Temporary File in Php

Laravel Create a tmp folder in project root folder. WordPress Create a tmp folder in project root folder.

Creating A Temporary File in Php

Or if you to lazy to click 😀

$temp = tmpfile(); fwrite($temp, "writing to tempfile"); fseek($temp, 0); echo fread($temp, 1024); fclose($temp); // this removes the file 

Php — Create temporary file and auto removed, tmpfile. Creates a temporary file with a unique name in read-write (w+) mode and returns a file handle. The file is automatically removed when closed (using fclose ()), or when the script ends. Share. edited Nov 22, 2009 at 21:29. Code sample$temp = tmpfile();fwrite($temp, «writing to tempfile»);fseek($temp, 0);echo fread($temp, 1024);fclose($temp);Feedback

Create One Time Temporary Download Link with

Create One Time Temporary Download Link with Expiration in PHPhttps://www.tutorialswebsite.com/how-to- create -one-time- temporary -download- link -with-expiration

Unable to create a temporary file while uploading

upload_tmp_dir = "C:/Users/server/Pictures/tmp" to "C:\TEMP". 

Create the folder TEMP in C and gave the permissions. Seems like it only works when connecting to C: directly.

I finaly found out, why this error actually happens:

The IUSR Account (or the account the php process impersonates, depending on your authentication settings) needs to be able to enumerate the Parent Folder of the upload_tmp_dir folder.

This behaviour is odd, because this right is not needed for the log or sessions folders.

My Solution is the following (using the paths from above post):

1. Create the folder «C:/Users/server/Pictures/tmp»
2. Grant modify rights to IUSR (or other user) on that folder
3. Create the folder «C:/Users/server/Pictures/tmp/uploads»
4. Edit php.ini: upload_tmp_dir = «C:/Users/server/Pictures/tmp/uploads»

Alternatively you can grant read only rights on «this folder only» on the parent folder «C:/Users/server/Pictures/tmp». In that case you dont need another subfolder.

Recently while working in Laravel and WordPress (php version 7.3) I got this error «File upload error — unable to create a temporary file in Unknown on line 0»

Solution that worked for me is. Hope this helps anyone facing such issue.

Laravel

1. Create a tmp folder in project root folder. Make sure it has write permissions properly set.
2. Create php.ini file in public folder.

WordPress

1. Create a tmp folder in project root folder. Make sure it has write permissions properly set.
2. Create php.ini file in wp_admin folder. Add below lines specifically in php.ini in addition to your other ini settings.

here path will be like /home/cpanel username/public_html/folder/project/tmp

NOTE: In case you are working in Laravel.. do not forget to link storage folder if you are storing files in storage folder. For this run below command at terminal.

Answer added to this post also. Warning: File upload error — unable to create a temporary file in Unknown on line 0

Creating A Temporary File in Php, Creating A Temporary File in Php. Ask Question Asked 10 years, 10 months ago. Modified 10 years, 10 months ago. Viewed 7k times Do you NEED to create a temporary file on the server? – horatio. Oct 4, 2011 at 17:19. Add a comment | 2 Answers Sorted by: Reset to

How to download a temporary file

Note that tmpfile() returns a file handle, but all the functions you have need a file path (i.e a string), not a handle — notably basename , filesize , and readfile . So none of those function calls will work correctly. Also basename won’t return a file extension either. Just call it whatever you want, i.e

'Content-Disposition: attachment; filename=data.csv' 

As @Joshua Burns also says, make sure you’re passing in an array to fputcsv or use the assoc parameter.

json_decode() by default translates elements into objects rather than arrays. fputcsv() expects the data passed to be an array.

$jsonArray = json_decode( $_POST['json'] ); 

$jsonArray = json_decode( $_POST['json'], True ); 

And see if that doesn’t fix your problem.

When attempting to tackle problems such as these I’d highly recommend enabling display_errors and setting error_reporting to E_ALL to see if there some sort of error you are missing out on:

Firstly, check this string out, i would change it to:

header('Content-Disposition: attachment; filename="'.basename($tmp).'"'); 

i had the problem with it once, with browser compatibility 🙂

Create a temp file with a specific extension using php, Let’s say tempnam() gives you a file of «filename». You move it to «filename.ext». At any point, tempnam() can give you «filename» again. If you check for «filename.ext», reject the filename given by tempnam(), and call it again, you still end up with the possibility that between one step and another, a file will get …

Making a temporary dir for unpacking a zipfile into

quite easy (I took partly it from the PHP manual):

 mkdir($tempfile); if (is_dir($tempfile)) < return $tempfile; >> /*example*/ echo tempdir(); // returns: /tmp/8e9MLi 

Please look at Will’s solution below.

=> My answer should not be the accepted answer anymore.

So I first found a post by Ron Korving on PHP.net, which I then modified to make a bit safer (from endless loops, invalid characters, and unwritable parent dirs) and use a bit more entropy.

 /* Trim trailing slashes from $dir. */ $dir = rtrim($dir, DIRECTORY_SEPARATOR); /* If we don't have permission to create a directory, fail, otherwise we will * be stuck in an endless loop. */ if (!is_dir($dir) || !is_writable($dir)) < return false; >/* Make sure characters in prefix are safe. */ if (strpbrk($prefix, '\\/:*?"<>|') !== false) < return false; >/* Attempt to create a random directory until it works. Abort if we reach * $maxAttempts. Something screwy could be happening with the filesystem * and our loop could otherwise become endless. */ $attempts = 0; do < $path = sprintf('%s%s%s%s', $dir, DIRECTORY_SEPARATOR, $prefix, mt_rand(100000, mt_getrandmax())); >while ( !mkdir($path, $mode) && $attempts++ < $maxAttempts ); return $path; >?> 

/var/folders/v4/647wm24x2ysdjwx6z_f07_kw0000gp/T/tmp_900342820 bool(true) bool(true) bool(true) /tmp/stack_1102047767 bool(true) bool(true) bool(true) /var/folders/v4/647wm24x2ysdjwx6z_f07_kw0000gp/T/stack_638989419 bool(true) bool(true) bool(true) 

Another option if running on linux with mktemp and access to the exec function is the following:

XXXXXX"; if (($dir) && (is_dir($dir))) < $tmpdir = "--tmpdir=$dir"; >else < $tmpdir = '--tmpdir=' . sys_get_temp_dir(); >return exec("mktemp -d $tmpdir $template"); > /*example*/ $dir = tempdir(); echo "$dir\n"; rmdir($dir); $dir = tempdir('/tmp/foo', 'bar'); echo "$dir\n"; rmdir($dir); // returns: // /tmp/BN4Wcd // /tmp/foo/baruLWFsN (if /tmp/foo exists, /tmp/baruLWFsN otherwise) ?> 

This avoids the potential (although unlikely) race issue above and has the same behavior as the tempnam function.

PHP create random tmp file and get its full path, Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams

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tmpfile

Creates a temporary file with a unique name in read-write-binary (w+b) mode and returns a file handle.

The file is automatically removed when closed (for example, by calling fclose() , or when there are no remaining references to the file handle returned by tmpfile() ), or when the script ends.

If the script terminates unexpectedly, the temporary file may not be deleted.

Parameters

This function has no parameters.

Return Values

Returns a file handle, similar to the one returned by fopen() , for the new file or false on failure.

Examples

Example #1 tmpfile() example

$temp = tmpfile ();
fwrite ( $temp , «writing to tempfile» );
fseek ( $temp , 0 );
echo fread ( $temp , 1024 );
fclose ( $temp ); // this removes the file
?>

The above example will output:

See Also

• tempnam() — Create file with unique file name
• sys_get_temp_dir() — Returns directory path used for temporary files

User Contributed Notes 7 notes

To get the underlying file path of a tmpfile file pointer:

$file = tmpfile ();
$path = stream_get_meta_data ( $file )[ ‘uri’ ]; // eg: /tmp/phpFx0513a

I found this function useful when uploading a file through FTP. One of the files I was uploading was input from a textarea on the previous page, so really there was no «file» to upload, this solved the problem nicely:

# Upload setup.inc
$fSetup = tmpfile ();
fwrite ( $fSetup , $setup );
fseek ( $fSetup , 0 );
if (! ftp_fput ( $ftp , «inc/setup.inc» , $fSetup , FTP_ASCII )) echo «
Setup file NOT inserted

» ;
>
fclose ( $fSetup );
?>

The $setup variable is the contents of the textarea.

And I’m not sure if you need the fseek($temp,0); in there either, just leave it unless you know it doesn’t effect it.

Since this function may not be working in some environments, here is a simple workaround:

function temporaryFile($name, $content)
$file = DIRECTORY_SEPARATOR .
trim(sys_get_temp_dir(), DIRECTORY_SEPARATOR) .
DIRECTORY_SEPARATOR .
ltrim($name, DIRECTORY_SEPARATOR);

register_shutdown_function(function() use($file) unlink($file);
>);

at least on Windows 10 with php 7.3.7, and Debian Linux with php 7.4.2,

the mode is not (as the documentation states) ‘w+’ , it is ‘w+b’

(an important distinction when working on Windows systems)

To get tmpfile contents:
$tmpfile = tmpfile ();
$tmpfile_path = stream_get_meta_data ( $tmpfile )[ ‘uri’ ];
// . write to tmpfile .
$tmpfile_content = file_get_contents ( $tmpfile_path );
?>

Perhaps not the best way for production code, but good enough for logging or a quick var_dump() debug run.

No, the fseek() is necessary — after writing to the file, the file pointer (I’ll use «file pointer» to refer to the current position in the file, the thing you change with fseek()) is at the end of the file, and reading at the end of the file gives you EOF right away, which manifests itself as an empty upload.

Where you might be getting confused is in some systems’ requirement that one seek or flush between reading and writing the same file. fflush() satisfies that prerequisite, but it doesn’t do anything about the file pointer, and in this case the file pointer needs moving.

Beware that PHP’s tmpfile is not an equivalent of unix’ tmpfile.
PHP (at least v. 5.3.17/linux I’m using now) creates a file in /tmp with prefix «php», and deletes that file on fclose or script termination.
So, if you want to be sure that you don’t leave garbage even in case of a fatal error, or killed process, you shouldn’t rely on this function.
Use the classical method of deleting the file after creation:
$fn = tempnam ( ‘/tmp’ , ‘some-prefix-‘ );
if ( $fn )
$f = fopen ( $fn , ‘w+’ );
unlink ( $fn ); // even if fopen failed, because tempnam created the file
if ( $f )
do_something_with_file_handle ( $f );
>
>
?>

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