下面3個函數的用法

ob_get_contents();

ob_end_clean();

ob_start()

使用ob_start()把輸出那同輸出到緩沖區，而不是到瀏覽器。

然后用ob_get_contents得到緩沖區的數據。

ob_start()在服務器打開一個緩沖區來保存所有的輸出。所以在任何時候使用echo ，輸出都將被加入緩沖區中，直到程序運行結束或者使用ob_flush()來結束。然后在服務器中緩沖區的內容才會發送到瀏覽器，由瀏覽器來解析顯示。

函數ob_end_clean 會清除緩沖區的內容，并將緩沖區關閉，但不會輸出內容。

此時得用一個函數ob_get_contents()在ob_end_clean()前面來獲得緩沖區的內容。

這樣的話， 能將在執行ob_end_clean()前把內容保存到一個變量中，然后在ob_end_clean()后面對這個變量做操作。

這是EG：

ob_start(); // buf1

echo ' multiple ';

ob_start(); // buf2

echo ' buffers work ';

$buf2 = ob_get_contents();

ob_end_clean();

$buf1 = ob_get_contents();

ob_end_clean();

echo $buf1;

echo '
';

echo $buf2;

ob_get_contents

(PHP 4, PHP 5)

ob_get_contents -- Return the contents of the output buffer

Description

string ob_get_contents ( void )

This will return the contents of the output buffer or FALSE, if output buffering isn't active.

See also ob_start() and ob_get_length().

if you use ob_start with a callback function as a parameter, and that function changes ob string (as in example in manual) don't expect that ob_get_contents will return changed ob.

it will work as you would use ob_start with no parameter at all. So don't be confused.

transfer image, another method (alternative to fsockopen or function socket) :

server(192.168.0.1)

makeimage.php

...........

...........

$nameimage="xxxx.jpg"

$comand=exec("plotvelocity.sh $nameimage $paramater1 $paramater2");

ob_start();

readfile($nameimage);

$image_data = ob_get_contents();

ob_end_clean();

echo $image_data;

unlink($nameimage);

Client (192.168.0.2)

$bild="images/newimage2.gif";

$host="192.168.0.1";

$url=file_get_contents("http://$host/makeimage.php?$querystring");

$fp = fopen("$bild", 'wb');

fwrite($fp, $url);

fclose($fp);

echo '';

naturally you can transfer whichever thing and not only images

ob_get_clean

(PHP 4 >= 4.3.0, PHP 5)

ob_get_clean -- Get current buffer contents and delete current output buffer

Description

string ob_get_clean ( void )

This will return the contents of the output buffer and end output buffering. If output buffering isn't active then FALSE is returned. ob_get_clean() essentially executes both ob_get_contents() and ob_end_clean().

例子 1. A simple ob_get_clean() example<?php

ob_start();

echo "Hello World";

$out = ob_get_clean();

$out = strtolower($out);

var_dump($out);

?>

Our example will output: string(11) "hello world"

See also ob_start() and ob_get_contents().

Notice that the function beneath does not catch errors, so throw in an @ before those ob_* calls

Running PHP4 < 4.3.0, you can simply add the following to use the function anyway:

if (!function_exists("ob_get_clean")) {

function ob_get_clean() {

$ob_contents = ob_get_contents();

ob_end_clean();

return $ob_contents;

}

}

?>

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