gzread

(PHP 4, PHP 5, PHP 7, PHP 8)

gzreadBinary-safe gz-file read

说明

gzread ( resource $stream , int $length ) : string|false

gzread() reads up to length bytes from the given gz-file pointer. Reading stops when length (uncompressed) bytes have been read or EOF is reached, whichever comes first.

参数

stream

The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().

length

The number of bytes to read.

返回值

The data that have been read, 或者在失败时返回 false.

更新日志

版本 说明
7.4.0 This functions returns false on failure now; previously 0 was returned.

范例

Example #1 gzread() example

<?php
// get contents of a gz-file into a string
$filename "/usr/local/something.txt.gz";
$zd gzopen($filename"r");
$contents gzread($zd10000);
gzclose($zd);
?>

参见

  • gzwrite() - Binary-safe gz-file write
  • gzopen() - Open gz-file
  • gzgets() - Get line from file pointer
  • gzgetss() - Get line from gz-file pointer and strip HTML tags
  • gzfile() - Read entire gz-file into an array
  • gzpassthru() - Output all remaining data on a gz-file pointer

User Contributed Notes

waldermort at gmail dot com 26-Jul-2017 07:19
Be careful when reading data in a loop. gzread() behaves a little differently than bzread() or fread(), it does NOT return false when reading past the end of stream. It instead returns an empty string.

So a loop like:
$handle = gzopen($file);
while (false !== $chunk = gzread($handle, $bytes)) {
   //...
}

will loop indefinitely.
Nitrogen 17-Sep-2012 03:02
Here is a function for returning the uncompressed filesize of a gzip file. The filesize is stored as a 32-bit integer in the end of the compressed file, that's how this function works. Additionally, this function checks to see if it's a real gzip compressed file before doing the work; if it isn't, then just like other gz- functions, it'll treat it just like a regular file and perform a normal filesize operation. Enjoy!

<?php

function gzfilesize($filename) {
 
$gzfs = FALSE;
  if((
$zp = fopen($filename, 'r'))!==FALSE) {
    if(@
fread($zp, 2) == "\x1F\x8B") { // this is a gzip'd file
     
fseek($zp, -4, SEEK_END);
      if(
strlen($datum = @fread($zp, 4))==4)
       
extract(unpack('Vgzfs', $datum));
    }
    else
// not a gzip'd file, revert to regular filesize function
     
$gzfs = filesize($filename);
   
fclose($zp);
  }
  return(
$gzfs);
}

?>
calin_ip at yahoo dot com 10-Nov-2010 03:55
Regarding finding out the lenght of the gz file.
For some reason the seek() function didn't worked, so, I've tried finding out the last 4 bytes using string functions.
That worked pretty well. Here is the code.
<?php
$stringu
='my_beautiful_file.txt.gz';
$gzip=file_get_contents($stringu);
$rest = substr($gzip, -4);
$GZFileSize = end(unpack("V", $rest));

$FileRead = $stringu;
$HandleRead = gzopen($FileRead, "rb");
$ContentRead = gzread($HandleRead, $GZFileSize);
gzclose($HandleRead);
?>
denis at bitrix dot ru 16-Jul-2010 09:00
Note that this functions' behavior differs from fread in case of EOF.

When you read the last chunk (mean the last bytes from file), it is EOF just after gzread, but in case of fread you need to read once more to get EOF.

Hope, I am clear :)
robinv12001 at yahoo dot co dot in 10-Jun-2009 09:21
<?php
//Extracting the content of a gzip file in php and creating a new csv file using the content
//Create a folder uploads inside current folder
$local_file    =    'test.gz';

//To Get the size of the uncompressed file
$FileRead = $local_file;
$FileOpen = fopen($FileRead, "rb");
fseek($FileOpen, -4, SEEK_END);
$buf = fread($FileOpen, 4);
$GZFileSize = end(unpack("V", $buf));
fclose($FileOpen);
//To Get the size of the zip file

$fzip_size    =    $GZFileSize;
   
$filename    =    $local_file;
$ext        =    pathinfo($filename,PATHINFO_EXTENSION);   
$file_name    =    pathinfo($filename,PATHINFO_FILENAME);       
$file_name    =    $file_name.".csv";

$zd         =     gzopen($filename, "rb");
$contents     =     gzread($zd, $fzip_size);
gzclose($zd);
$file_name    =    "uploads/".$file_name;
$fp    =    fopen($file_name, "wb");
fwrite($fp, $contents); //write contents of feed to cache file
fclose($fp);
if(
file_exists($file_name))
{
   
chmod($file_name,0755);
   
unlink($local_file);
}
?>
robinv12001 at yahoo dot co dot in 09-Jun-2009 02:18
<?php
//Using FTP Download a gzip file on current date from a remote server
//The gzip files are extracted
function parse_rawlist( $array )
{
   
$i=0;
    foreach(
$array as $curraw)
    {
       
$struc = array();
       
$current = preg_split("/[\s]+/",$curraw,9);

       
$struc['perms']      =     $current[0];
       
$struc['number']     =     $current[1];
       
$struc['owner']     =     $current[2];
       
$struc['group']      =     $current[3];
       
$struc['size']         =     $current[4];
       
$struc['month']      =     $current[5];
       
$struc['day']        =     $current[6];
       
$struc['time']      =     $current[7];
       
$struc['zfile_name']      =     $current[8];
    
$structure[$i]      =     $struc;
   
$i++;
    }
   return
$structure;

}
ini_set('memory_limit', '100M');

//Give FTP Information Here
//------------------------------------------------------------
$ftp_server     =     "example.com";
$ftp_user_name    =    "example";
$ftp_user_pass    =    "test";
//------------------------------------------------------------
//------------------------------------------------------------
$local_path     =    '/opt/lampp/htdocs/sample/test.gz';//Local Path
$server_path     =     'outgoing/folder/';//Remote Sever Path
//------------------------------------------------------------

$conn_id = ftp_connect($ftp_server,21);
if(
$conn_id)
{
    echo
"Successfully connected";
}
 
$login_result     =     ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
ftp_chdir($conn_id, $server_path);//Change Current Working Directory
$file_list     =    ftp_rawlist($conn_id,".");
$zip_details    =    parse_rawlist($file_list);
set_time_limit(1000);
$curr_date    =    strtotime(date("F d Y"));
for(
$i=0;$i<count($zip_details);$i++)
{
   
$fname        =    $zip_details[$i]['zfile_name'];   
   
$mod_date1    =    $zip_details[$i]['month']." ".$zip_details[$i]['day']." ".date("Y");   
   
$mod_date    =    strtotime($mod_date1);//File Modified Date
   
if($mod_date == $curr_date)//If modified date equals current date
   
{
       
$local_file    =    $fname;
       
$server_file    =    $fname;
        if (
ftp_get($conn_id, $local_file, $server_file, FTP_BINARY))
        {
       
            echo
"<br/>Successfully written to $local_file\n";
        }
        else
        {
            echo
"<br/>There was a problem\n";
        }
        if(
file_exists($local_file))
        {
           
$fzip_size    =    $zip_details[$i]['size'];   
           
$filename    =    $local_file;
           
$ext        =    pathinfo($filename,PATHINFO_EXTENSION);   
           
$file_name    =    pathinfo($filename,PATHINFO_FILENAME);       
           
$file_name    =    $file_name.".csv";
           
$zd         =     gzopen($filename, "r");
           
$contents     =     gzread($zd, $fzip_size);
           
$file_name    =    "uploads/".$file_name;
           
file_put_contents($file_name,addslashes($contents));
            if(
file_exists($file_name))
            {
               
chmod($file_name,0755);
               
unlink($local_file);
            }
           
gzclose($zd);
        }
    }
}
ftp_close($conn_id);
?>
utku 08-Feb-2008 01:31
I don't think it would be wise to open a whole gzip file (it _is_ compressed for a reason, and likely to be a very big file) into a single string. You would most likely hit the php memory limits. Instead, if you need to process the file, put your gzread calls in a loop, and read incrementally by a setting $length to a constant value.
zaotong at yahoo dot com 07-Mar-2007 03:06
As was shown to me in another forum there is a way to get the uncompressed size of the gz file by viewing the last 4 bytes of the gz file.

Here is a piece of code that will do this
<?php
$FileRead
= 'SomeText.txt';
$FileOpen = fopen($FileRead, "rb");
       
fseek($FileOpen, -4, SEEK_END);
       
$buf = fread($FileOpen, 4);
       
$GZFileSize = end(unpack("V", $buf));
       
fclose($FileOpen);
       
$HandleRead = gzopen($FileRead, "rb");
       
$ContentRead = gzread($HandleRead, $GZFileSize);
?>

This will read the last 4 bytes of the gz file and use it as the file int for the gzread.

Thanks to stereofrog for helping me with this code.