bzread

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

bzreadBinary safe bzip2 file read

Description

bzread(resource $bz, int $length = 1024): string|false

bzread() reads from the given bzip2 file pointer.

Reading stops when length (uncompressed) bytes have been read or EOF is reached, whichever comes first.

Parameters

bz

The file pointer. It must be valid and must point to a file successfully opened by bzopen().

length

If not specified, bzread() will read 1024 (uncompressed) bytes at a time. A maximum of 8192 uncompressed bytes will be read at a time.

Return Values

Returns the uncompressed data, or false on error.

Examples

Example #1 bzread() example

<?php

$file
= "/tmp/foo.bz2";
$bz = bzopen($file, "r") or die("Couldn't open $file");

$decompressed_file = '';
while (!
feof($bz)) {
$decompressed_file .= bzread($bz, 4096);
}
bzclose($bz);

echo
"The contents of $file are: <br />\n";
echo
$decompressed_file;

?>

See Also

  • bzwrite() - Binary safe bzip2 file write
  • feof() - Tests for end-of-file on a file pointer
  • bzopen() - Opens a bzip2 compressed file

add a note add a note

User Contributed Notes 2 notes

up
4
user@anonymous
11 years ago
Make sure you check for bzerror while looping through a bzfile. bzread will not detect a compression error and can continue forever even at the cost of 100% cpu.

$fh = bzopen('file.bz2','r');
while(!feof($fh)) {
  $buffer = bzread($fh);
  if($buffer === FALSE) die('Read problem');
  if(bzerror($fh) !== 0) die('Compression Problem');
}
bzclose($fh);
up
1
Anonymous
8 years ago
The earlier posted code has a small bug in it: it uses bzerror instead of bzerrno. Should be like this:

$fh = bzopen('file.bz2','r');
while(!feof($fh)) {
  $buffer = bzread($fh);
  if($buffer === FALSE) die('Read problem');
  if(bzerrno($fh) !== 0) die('Compression Problem');
}
bzclose($fh);
To Top