Reading and writing to compressed gzip files can be done in much the same way as reading and writing normal files. The main difference is the use of some special functions that compress and uncompress the data. Rather then use fopen() to open a file, you open a compressed file with gzopen(). This is the case for many of the file access functions, although you should be aware that they don't all work exactly the same as each other. Here are some examples of the compression functions in use.
To read from a compressed file use the following script.
// read from file
$inputfile = 'text.gz';
$filecontents = '';
$ifh = gzopen($inputfile, 'r');
while ( $line = gzgets($ifh, 1024) ) {
$filecontents .= $line;
}
echo $filecontents;
gzclose($ifh);// writing to a complessed file
$inputfile = 'text.gz';
$string = 'lalalala';
$filecontents = '';
$ifh = gzopen($inputfile, 'r');
while ( $line = gzgets($ifh, 1024) ) {
$filecontents .= $line;
}
gzclose($ifh);
$ifh = gzopen($inputfile, 'w');
if ( !gzwrite($ifh, $filecontents.$string) ) {
// write failed
}
gzclose($ifh);// compress
$inputfile = 'text.txt';
$outputfile = 'text.gz';
// open files
$ifh = fopen($inputfile, 'rb');
$ofh = fopen($outputfile, 'wb');
// encode string
$encoded = gzencode(fread($ifh, filesize($inputfile)));
if ( !fwrite($ofh, $encoded) ) {
// write failed
}
// close files
fclose($ifh);
fclose($ofh);// uncompress
$inputfile = 'text.gz';
$outputfile = 'text.txt';
$ofh = fopen($outputfile, 'wb');
$string = '';
$ifh = gzopen($inputfile, 'r');
while ( $line = gzgets($ifh, 1024) ) {
$string .= $line;
}
if ( !fwrite($ofh, $string) ) {
// write failed
}
echo $string;
gzclose($ifh);
fclose($ofh);$ifh = gzopen($inputfile, 'r');
$ifh = fopen($inputfile, 'rb');