PHP compressed CSS file sample code

// This defines the header type
header("Content-type: text/css");

// Start the output buffer
ob_start("compress_css");

// Function which actually compress
// The CSS file
function compress_css($buffer)
{
 /* remove comments */
 $buffer = preg_replace("!/*[^*]**+([^/][^*]**+)*/!", "", $buffer) ;
 /* remove tabs, spaces, newlines, etc. */
 $arr = array("rn", "r", "n", "t", "  ", "    ", "    ") ;
 $buffer = str_replace($arr, "", $buffer) ;
 return $buffer;
}
/* include all CSS files */
include("style.css");
include("fonts.css");
include("print.css");
// Flush the output buffer
ob_end_flush();
?>

此使用了output buffer函数来实现，此函数说明，请参考：Output Buffer Explained(http://www.phpcodebase.com/php-output-buffering-explained/)。