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(PHP 4, PHP 5)
gzread — Liest aus einer gz-Datei
gzread() liest bis zu length Bytes aus der gegebenen gz-Datei Resource. Wird beim Lesen das Dateiende erreicht können auch weniger Bytes gelesen werden.
Die gz-Datei Resource. Dies muss auf eine gültige, erfolgreich mit gzopen() geöffnete Datei zeigen.
Die Anzahl der zu lesenden Bytes.
Die gelesenen Daten.
Beispiel #1 gzread() Beispiel
<?php
// Liest den Inhalt einer gz-Datei in einen String
$filename = "/usr/local/something.txt.gz";
$zd = gzopen($filename, "r");
$contents = gzread($zd, 10000);
gzclose($zd);
?>
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);
?>
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 :)
<?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);
}
?>
<?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);
?>
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.
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.
Be aware that gzread's second parameter - length reffers to the file's uncompressed size, therefore using this code:
<?php
$file_name = "/usr/local/something.txt.gz";
if($file_handle = gzopen($file_name, "r"))
{
$contents = gzread($file_handle, filesize($file_name));
gzclose($file_name);
}
?>
will probably truncate the content of the file as filesize checks for the file's compressed size.
So either use the actual uncompressed size, if you know it, or use an aribtrary big enough length, as gzreading will stop at the end of the file anyway.
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