SplTempFileObject::__construct

(PHP 5 >= 5.1.2)

SplTempFileObject::__construct — Construct a new temporary file object

说明

public SplTempFileObject::__construct ([ int $max_memory ] )

Construct a new temporary file object.

参数

max_memory

The maximum amount of memory (in bytes, default is 2 MB) for the temporary file to use. If the temporary file exceeds this size, it will be moved to a file in the system's temp directory.

If max_memory is negative, only memory will be used. If max_memory is zero, no memory will be used.

返回值

没有返回值。

错误／异常

Throws a RuntimeException if an error occurs.

范例

Example #1 SplTempFileObject() example

This example writes a temporary file in memory which can be written to and read from.

  <?php
$temp  = new  SplTempFileObject ();
 $temp -> fwrite ( "This is the first line\n" );
 $temp -> fwrite ( "And this is the second.\n" );
echo  "Written "  .  $temp -> ftell () .  " bytes to temporary file.\n\n" ;

 // Rewind and read what was written
 $temp -> rewind ();
foreach ( $temp  as  $line ) {
    echo  $line ;
}
 ?>

以上例程的输出类似于：

Written 47 bytes to temporary file.This is the first line
And this is the second.

参见

SplFileObject
PHP input/output streams (for php://temp and php://memory)

用户评论:

[#1] larry dot laski at gmail dot com [2015-05-15 15:46:25]

Noting that when the tmp file exceeds memory limitations and is written to the system temp directory, it is deleted upon completion of the script it was initially created in. At least that is what I have seen and wanted to document for others since it wasn't clear.