Web Design

Example 1.

ob_start(); //打開緩衝區
echo "Hello\n"; //輸出
header(“location:index.php”); //把瀏覽器重定向到index.php
ob_end_flush();//輸出全部內容到瀏覽器
?>

Example 2.
---------------------------------------------------------
for(i = 1; i <= 300; i ) print(“ “);
// 這一句話非常關鍵，cache的結構使得它的內容只有達到一定的大小才能從瀏覽器裡輸出
// 換言之，如果cache的內容不達到一定的大小，它是不會在程式執行完畢前輸出的。經
// 過測試，我發現這個大小的底限是256個字符長。這意味著cache以後接收的內容都會
// 源源不斷的被發送出去。
For(j = 1; j <= 20; j ) {
echo j.”
”;
flush(); //這一部會使cache新增的內容被擠出去，顯示到瀏覽器上
sleep(1); //讓程式“睡”一秒鐘，會讓你把效果看得更清楚
}
?>

ob_start(); //打開緩衝區
phpinfo(); //使用phpinfo函數
info=ob_get_contents(); //得到緩衝區的內容並且賦值給info
file=fopen('info.txt','w'); //打開文件info.txt
fwrite(file,info); //寫入資訊到info.txt
fclose(file); //關閉文件info.txt
?>

Example 4.

ob_start();//打開緩衝區
?>
php頁面的全部輸出
content = ob_get_contents();//取得php頁面輸出的全部內容
fp = fopen(“output00001.html”, “w”); //創建一個文件，並打開，準備寫入
fwrite(fp, content); //把php頁面的內容全部寫入output00001.html，然後……
fclose(fp);
?>

Example 5.

Function run_code(code) {
If(code) {
ob_start();
eval(code);
contents = ob_get_contents();
ob_end_clean();
}else {
echo “錯誤！沒有輸出”;
exit();
}
return contents;
}

Example 6. 加快傳輸

/*
** Title.........: PHP4 HTTP Compression Speeds up the Web
** Version.......: 1.20
** Author........: catoc
** Filename......: gzdoc.php
** Last changed..: 18/10/2000
** Requirments...: PHP4 >= 4.0.1
** PHP was configured with --with-zlib[=DIR]
** Notes.........: Dynamic Content Acceleration compresses
** the data transmission data on the fly
** code by sun jin hu (catoc)
** Most newer browsers since 1998/1999 have
** been equipped to support the HTTP 1.1
** standard known as "content-encoding."
** Essentially the browser indicates to the
** server that it can accept "content encoding"
** and if the server is capable it will then
** compress the data and transmit it. The
** browser decompresses it and then renders
** the page.
**
** Modified by John Lim (jlim@natsoft.com.my)
** based on ideas by Sandy McArthur, Jr
** Usage........:
** No space before the beginning of the first ' ** ------------Start of file---------
-
** ︱ ** ︱ include('gzdoc.php');
** ︱? >
** ︱
** ︱... the page ...
** ︱
** ︱ ** ︱ gzdocout();
** ︱? >
** -------------End of file-----------
*/
ob_start();
ob_implicit_flush(0);
function CheckCanGzip(){
global HTTP_ACCEPT_ENCODING;
if (headers_sent() ︱︱ connection_timeout() ︱︱ 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=1,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;
}
}
?>