tmpfile

(PHP 4, PHP 5)

tmpfile — 建立一个临时文件

说明

resource tmpfile ( void )

以读写（w+）模式建立一个具有唯一文件名的临时文件，返回一个与 fopen() 所返回相似的文件句柄。文件会在关闭后（用 fclose()）自动被删除，或当脚本结束后。

详细信息请参考系统手册中的 tmpfile(3) 函数，以及 stdio.h 头文件。

Example #1 tmpfile() 例子


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

以上例程会输出：

writing to tempfile

参见 tempnam()。

返回值

Returns a file handle, similar to the one returned by fopen(), for the new file 或者在失败时返回 FALSE.

范例

Example #2 tmpfile() example


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

以上例程会输出：

writing to tempfile

参见

tempnam() - 建立一个具有唯一文件名的文件
sys_get_temp_dir() - Returns directory path used for temporary files

PHP手册 - N: 建立一个临时文件

用户评论:

kexianbin at diyism dot com (23-Nov-2011 03:24)

A clean method to use temporary file: <?php $tmp=array_search('uri', @array_flip(stream_get_meta_data($GLOBALS[mt_rand()]=tmpfile()))); file_put_contents($tmp, 'hello'); echo file_get_contents($tmp); ?> without need to fclose the tmp file, it will be deleted while the php ends.

o_O Tync (20-Apr-2007 06:26)

Remember, that open_basedir affects this function. You will get an error: Warning: tmpfile() [function.tmpfile]: open_basedir restriction in effect. File(/var/tmp) is not within the allowed path(s): ....blablabla =)

oremanj at gmail dot com (09-Apr-2007 07:46)

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

zlynx at acm dot org (14-Mar-2007 01:02)

I am fairly sure that the seek just flushes the data from the memory buffers to the file. fflush() should give you the same effect.

(05-Sep-2006 07:53)

By the way, this function is really useful for libcurl's CURLOPT_PUT feature if what you're trying to PUT is a string. For example: <?php /* Create a cURL handle. */ $ch = curl_init(); /* Prepare the data for HTTP PUT. */ $putString = "Hello, world!"; $putData = tmpfile(); fwrite($putData, $putString); fseek($putData, 0); /* Set cURL options. */ curl_setopt($ch, CURLOPT_URL, "http://www.example.com"); curl_setopt($ch, CURLOPT_PUT, true); curl_setopt($ch, CURLOPT_INFILE, $putData); curl_setopt($ch, CURLOPT_INFILESIZE, strlen($putString)); /* ... (other curl options) ... */ /* Execute the PUT and clean up */ $result = curl_exec($ch); fclose($putData); curl_close($ch); ?>

(03-Aug-2006 02:05)

fseek() is important because if you forget about it you will upload empty file... i had sth like that ^_^

chris [at] pureformsolutions [dot] com (04-Oct-2005 08:14)

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 " 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.