(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
ob_get_flush — 刷新输出缓冲区，将其作为字符串返回并关闭输出缓冲区
ob_get_flush() 刷新输出缓冲区，将其作为字符串返回并关闭输出缓冲。
输出缓冲区比由带有 PHP_OUTPUT_HANDLER_FLUSHABLE flag 的 ob_start() 启动。否则 ob_get_flush() 将不起作用。
注意: 此函数与 ob_end_flush() 相似，不同的是此函数会把缓冲区作为字符串返回。
此函数没有参数。
返回输出缓冲区的内容或者没有缓冲区激活时返回 false。
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
(
)
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 userI 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 errorI 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();
?>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();
?>