... Opens a temporary file and writes a test string to it, then it prints out the content of this file twice. ... php $ filename = tempnam ('/tmp', 'zlibtest').'.gz'; print html \n head /head \n body \n pre \n ; $s = Only a test , test , test , test , test , test , test , test !\n ; // open file for writing with maximum compression $zp = gzopen($ filename , w9 ); // write string to file gzwrite($zp, $s); // close file gzclose($zp); // open ... gzopen -- Open gz-file . ...