如何清除PHP中以前回显的项目 [英] How to clear previously echoed items in PHP

问题描述

在php中，有什么方法可以清除/删除所有先前回显或打印的项目?

In php, is there any way to clear/remove all previously echoed or printed items?

例如:

<?php

echo 'a';
print 'b';

// some statement that removes all printed/echoed items

echo 'c';

// the final output should be equal to 'c', not 'abc'

?>

我的脚本使用了include函数.所包含的文件不应回显任何内容.万一有人(例如黑客)尝试，我需要一种删除方法.

My script uses the include function. The included files are not supposed to echo anything. Just in case someone (ex = hacker) tries, I need a way to remove.

推荐答案

<?php

ob_start();
echo 'a';
print 'b';

// some statement that removes all printed/echoed items
ob_end_clean();

echo 'c';

// the final output is equal to 'c', not 'abc'

?>

输出缓冲功能

输出缓冲功能在黑客中也非常有用，可以强制仅打印返回字符串的功能.

The output buffering functions are also useful in hackery to coerce functions that only print to return strings, ie.

<?php
ob_start();
var_dump($myVar);
$data = ob_get_clean();
// do whatever with $data
?>

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