tmpfile

(PHP 4, PHP 5)

tmpfileCrea un archivo temporal

Descripción

resource tmpfile ( void )

Crea un archivo temporal con un nombre único en modo lectura-escritura (w+) y devuelve un gestor de archivo.

El archivo es automáticamente eliminado cuando se cierra (por ejemplo, llamando a fclose(), o cuando no quedan referencias al gestor de ficheros devuelto por tmpfile()), o cuando el script finzaliza.

Para más detalles, consulte la documentación de su sistema acerca de la función tmpfile(3), así como de la cabecera de archivo stdio.h.

Valores devueltos

Devuelve un gestor de archivo, similar al devuleto por fopen(), para un archivo nuevo o FALSE en caso de error.

Ejemplos

Ejemplo #1 Ejemplo de tmpfile()

<?php
$temp 
tmpfile();
fwrite($temp"escribiendo en el archivo temporal");
fseek($temp0);
echo 
fread($temp1024);
fclose($temp); // esto elimina el archivo
?>

El resultado del ejemplo sería:

writing to tempfile

Ver también

  • tempnam() - Crea un archivo con un nombre de archivo único
  • sys_get_temp_dir() - Devuelve la ruta del directorio para archivos temporales

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User Contributed Notes 5 notes

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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);
      }
  }
?>
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1
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.
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0
Anonymous
7 years ago
fseek() is important because if you forget about it you will upload empty file...

i had sth like that ^_^
up
-1
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
-2
kexianbin at diyism dot com
1 year 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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