bzread

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

    bzread — Binary safe bzip2 file read

    Descrizione

    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.

    Elenco dei parametri

    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.

    Valori restituiti

    Returns the uncompressed data, or false on error.

    Esempi

    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;

    ?>

    Vedere anche:

    • bzwrite() - Binary safe bzip2 file write
    • feof() - Verifica se è stata raggiunta la fine del file su un puntatore a file
    • bzopen() - Opens a bzip2 compressed file

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    User Contributed Notes 2 notes

    up
    2
    user@anonymous
    13 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
    10 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);
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