PHP - Manual: ob_get_clean

2024-11-15

ob_get_contents »

« ob_flush

ob_get_clean

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

ob_get_clean — 得到当前缓冲区的内容并删除当前输出缓。

说明

ob_get_clean(): string

得到当前缓冲区的内容并删除当前输出缓冲区。

ob_get_clean() 实质上是一起执行了 ob_get_contents() 和 ob_end_clean()。

返回值

返回输出缓冲区的内容，并结束输出缓冲区。如果输出缓冲区不是活跃的，即返回 false 。

范例

示例 #1 A simple ob_get_clean() example


<?php

ob_start();

echo "Hello World";

$out = ob_get_clean();
$out = strtolower($out);

var_dump($out);
?>

以上例程会输出：


string(11) "hello world"

参见

ob_get_contents() - 返回输出缓冲区的内容
ob_start() - 打开输出控制缓冲

add a note

User Contributed Notes 6 notes

down

geo dot artemenko at gmail dot com ¶

8 years ago


The definition should mention that the function also "turns off output buffering", not just cleans it.

down

steven at bielik dot com ¶

11 years ago


Also, don't forget that you will need to ob_start() again for any successive calls:


<?php

ob_start();

echo "1";

$content = ob_get_clean();


ob_start(); // This is NECESSARY for the next ob_get_clean() to work as intended.

echo "2";

$content .= ob_get_clean();


echo $content;

?>



Output: 12


Without the second ob_start(), the output is 21 ...

down

paul+phpnet at earth2me dot com ¶

8 years ago


Keep in mind that output may be buffered by default, depending on how you are running PHP (CGI, CLI, etc.).   You can use ob_get_level() to determine if an output buffer has already been started.  On most web servers I've used, output buffering is already one level deep before my scripts start running.

You should only end as many output buffers as you start.  Assuming that your buffer is always the first buffer, or otherwise closing pre-existing buffers, could lead to problems.  In PHP 5.5, you can ensure that output buffers are ended properly using a try-finally block.

Something like this is almost guaranteed to break stuff:

<?php
// Don't ever do this!
while (ob_get_level() > 1)
{
    ob_end_flush();
}

$content = ob_get_clean();
?>

The problem is that number, "1".  Using a fixed number there is asking for trouble.  Instead, use ob_get_level() to get the number of output buffers applied when your code starts, and return to that number, if you really must use an unknown number of output buffers:

<?php
ob_start();
$saved_ob_level = ob_get_level();

// Do stuff here:
run_something();

// If you really must close all of your output buffers except one, this'll do it:
while (ob_get_level() > $start_ob_level)
{
    ob_end_flush();
}

// And now, the final output buffer that belongs to us:
$content = ob_get_clean();
?>

down

sergei dot solomonov at gmail dot com ¶

9 years ago


<?php

ob_start();

echo "1";

$content = ob_get_clean();


echo "2";

$content .= ob_get_clean();


echo $content;

?>



This script outputs 21 in CLI mode and 12 otherwise (under my apache and nginx)

down

-2

Peter Smartt ¶

4 years ago


I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate.  If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean().

down

-39

ludvig dot ericson at gmail dot com ¶

16 years ago


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

add a note

官方地址：https://www.php.net/manual/en/function.ob-get-clean.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP获取指定函数定义在哪个文件中及行号 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 adodb连接mysql多个数据库的问题 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗

略微加速

PHP官方手册 - 互联网笔记

ob_get_clean

说明

返回值

范例

参见

User Contributed Notes 6 notes