Hi,
this is just to add a behavior that I haven't understud at first place.
ob_get_flush actually returns the content of the buffer as a text but also it sends the buffer back to the browser so that it's displayed on user screen.
Use ob_get_clean if you do not want the buffer to be send to the user
ob_get_flush
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
ob_get_flush — 冲刷（发送）活动输出处理程序的返回值，返回活动输出缓冲区的内容并将其关闭
说明
该函数调用输出处理程序（使用 PHP_OUTPUT_HANDLER_FINAL
flag），冲刷（发送）其返回值，返回活动输出缓冲区的内容并关闭活动输出缓冲区。
如果没有以 PHP_OUTPUT_HANDLER_REMOVABLE flag 启动的活动输出缓冲区，ob_get_flush() 将失败。
ob_get_flush() 将冲刷（发送）输出处理程序的返回值，即使活动输出缓冲区是在没有
PHP_OUTPUT_HANDLER_FLUSHABLE flag 的情况下启动的。
参数
此函数没有参数。
返回值
成功时返回活动输出缓冲区的内容，失败时返回 false。
错误／异常
如果函数失败生成 E_NOTICE。
示例
示例 #1 ob_get_flush() 示例
<?php
// 使用 output_buffering=On
print_r(ob_list_handlers());
// 保存缓冲区到文件
$buffer = ob_get_flush();
file_put_contents('buffer.txt', $buffer);
print_r(ob_list_handlers());
?>以上示例会输出：
Array
(
[0] => default output handler
)
Array
(
)
参见
- ob_start() - 打开输出控制缓冲
- ob_get_contents() - 返回输出缓冲区的内容
- ob_flush() - 冲刷（发送）活动输出处理程序的返回值
- ob_end_flush() - 冲刷（发送）活动输出处理程序的返回值，并关闭活动输出缓冲区
- ob_get_clean() - 获取活动缓冲区的内容并将其关闭
add a note
User Contributed Notes 4 notes
info at pcdoctor dot fr ¶
16 years ago
taras dot dot dot di at gmail dot com ¶
16 years ago
I don't know how exactly this works, but if you call this function, PHP would behave as if headers have been sent (even though the output has gone to a string).
This means that you can't call this function, and then call setcookie for example.
This was verified by trial and error
zubin@byron ¶
19 years ago
I found this function is useful for storing output instead of displaying it. For example, I wanted to use an old function which echoed the ouput but I wanted it in a variable, not outputted immediately. Here's how:
<?php
// start generating html
$html = '<html><head>'; // etc
// start output buffering
ob_start();
// call function which outputs immediately
print_menu();
// append this to $html
$html .= ob_get_flush();
// empty output buffer
ob_clean();
?>
zubin@byron ¶
19 years ago
Correction to previous post: ob_get_clean() is better, ie:
<?php
// start generating html
$html = '<html><head>'; // etc
// start output buffering
ob_start();
// call function which outputs immediately
print_menu();
// append this to $html and empty buffer
$html .= ob_get_clean();
?>
