ob_start();          //打開緩沖區(qū)
echo "hello world";        //輸出內(nèi)容
$out=ob_get_clean();       //獲得緩沖區(qū)內(nèi)容并且結(jié)束緩沖區(qū)
$out=strtolower($out);       //將字符轉(zhuǎn)換為小寫
var_dump($out);        //輸出結(jié)果
//
 
if(!function_exists('ob_clean'))      //判斷函數(shù)是否被定義
{
  function ob_clean()       //定義函數(shù)
  {
    if(@ob_end_clean())
    {
      return ob_start();
    }
    trigger_error("ob_clean() failed to delete buffer.no buffer to delete.",e_user_notice);
    return false;
  }
}
//
 
header('content-type: multipart/x-mixed-replace;boundary=endofsection');  //發(fā)送標頭
print "n--endofsectionn";           //輸出內(nèi)容
$pmt=array("-","","|","/");           //定義數(shù)組
for($i=0;$i<10;$i++)            //通過循環(huán)進行操作
{
  sleep(1);             //暫停執(zhí)行
  print "content-type: text/plainnn";         //輸出內(nèi)容
  print "part $it".$pmt[$i % 4];          //輸出內(nèi)容
  print "--endofsectionn";           //輸出內(nèi)容
  ob_flush();             //發(fā)送緩沖區(qū)數(shù)據(jù)
  flush();              //刷新輸出緩沖
}
print "content-type: text/plainnn";         //輸出內(nèi)容
print "the endn";            //輸出內(nèi)容
print "--endofsection--n";           //輸出內(nèi)容