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set_file_buffer — Sets the file buffer size.


bool set_file_buffer(file_handle, buffer);
resource file_handle: File handle
int buffer: Buffer size in bytes


TRUE on success; FALSE on error


With this function, you can change the file buffer size for the specified file handle. Specifying a buffer size of 0 changes the operation mode to "unbuffered"; all other values change the operation mode to "fully buffered," using the given number of bytes.


Example 348. Change file buffer to 4KB

$fh = fopen("text.txt", "r+");
$buffer_size = 4096;

if(!set_file_buffer($fh, $buffer_size))
    echo ("Couldn't change file buffer size");
    echo ("New file buffer size is $buffer_size bytes");

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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