PHP 5.5.16 is released

tmpfile

(PHP 4, PHP 5)

tmpfileErstellt eine temporäre Datei

Beschreibung

resource tmpfile ( void )

Erstellt eine temporäre Datei mit einem eindeutigen Dateinamen im Lese-Schreib-Modus (w+) und gibt einen Dateizeiger zurück.

Die Datei wird automatisch gelöscht, wenn sie geschlossen wird (mit fclose()), oder wenn das Skript beendet wird.

Für Details lesen Sie bitte die Dokumentation zur tmpfile(3)-Funktion und die stdio.h-Header-Datei.

Rückgabewerte

Gibt einen Dateizeiger für die neue Datei zurück, der ähnlich zu dem Zeiger ist, den fopen() zurückgibt. Im Fehlerfall wird FALSE zurückgegeben..

Beispiele

Beispiel #1 tmpfile()-Beispiel

<?php
$temp 
tmpfile();
fwrite($temp"schreiben in Temporärdatei");
fseek($temp0);
echo 
fread($temp1024);
fclose($temp); // dies entfernt die Datei

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

schreiben in Temporärdatei

Siehe auch

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User Contributed Notes 5 notes

up
3
chris [at] pureformsolutions [dot] com
8 years ago
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:

<?php
   
# Upload setup.inc
   
$fSetup = tmpfile();
   
fwrite($fSetup,$setup);
   
fseek($fSetup,0);
    if (!
ftp_fput($ftp,"inc/setup.inc",$fSetup,FTP_ASCII)) {
        echo
"<br /><i>Setup file NOT inserted</i><br /><br />";
    }
   
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.
up
0
oremanj at gmail dot com
7 years ago
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.

-- Josh
up
-1
ssandor
1 year ago
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:
<?php
$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);
      }
  }
?>
up
-1
Anonymous
8 years ago
fseek() is important because if you forget about it you will upload empty file...

i had sth like that ^_^
up
-5
kexianbin at diyism dot com
2 years ago
If you want to specify the extension name of tmp file:

<?php
$tmp
=array_search('uri', @array_flip(stream_get_meta_data($GLOBALS[mt_rand()]=tmpfile())));
rename($tmp, $tmp.='.png');
register_shutdown_function(create_function('', "unlink('{$tmp}');"));
?>
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