topic

Compression of pages on PHP

The basic purpose of a script - compression of the pages transmitted by the server to a browser. At me it was on the average compressed in 4 times.

One "BUT": do not put a level of compression more than 3 - the size will not decrease, and loading on the server - still as.

The script is used as follows:

include (' gzdoc.php ');

<HTML>

... the page...

</HTML>

gzdocout ();

gzdoc.php

** |

** |... the page...

** |

**-------------End of file-----------

ob_start ();

ob_implicit_flush (0);

function CheckCanGzip () {

global $HTTP_ACCEPT_ENCODING;

if (headers_sent () || connection_aborted ()) {

return 0;

}

if (strpos ($HTTP_ACCEPT_ENCODING, ' x-gzip ')! == false) return "x-gzip";

if (strpos ($HTTP_ACCEPT_ENCODING, ' gzip ')! == false) return "gzip";

return 0;

}

/* $level = compression level 0-9, 0=none, 9=max */

function GzDocOut ($level=3, $debug=0) {

$ENCODING = CheckCanGzip ();

if ($ENCODING) {

print "\n\n";

$Contents = ob_get_contents ();

ob_end_clean ();

if ($debug) {

$s = " Not compress

length: " .strlen ($Contents.) ";";

$s. = " Compressed length: ".

strlen (gzcompress ($Contents, $level)).

" ";

$Contents. = $s;

}

header (" Content-Encoding: $ENCODING ");

print "\x1f\x8b\x08\x00\x00\x00\x00\x00";

$Size = strlen ($Contents);

$Crc = crc32 ($Contents);

$Contents = gzcompress ($Contents, $level);

$Contents = substr ($Contents, 0, strlen ($Contents) - 4);

print $Contents;

print pack (' V ', $Crc);

print pack (' V ', $Size);

exit;

} else {

ob_end_flush ();

exit;

}