使用nl2br混淆Php函数结果

问题描述：

I'm simply experimenting with PHP to prepare me for some upcoming projects and I've encountered a string which won't have <br /> inserted into it even though it is a multi-line string.

The code is simple PHP (which I've enclosed in simple html tags)

$ping = passthru('ping www.google.com');
$ping = htmlspecialchars_decode($ping);
$ping = strip_tags($ping);
$ping = nl2br($ping);
echo $ping;

The result is a multi-line string but without any <br /> tags added, however, the page source shows the result as a mutli-line string so there's definitely multiple lines there but nl2br() is not doing anything.

Page source (which has mysteriously added extra whitespace lines when I pasted it in here)

<html>

    <head>

        <title>Derp</title>



    </head>

    <body><p>



Pinging www.l.google.com [209.85.227.147] with 32 bytes of data:

Reply from 209.85.227.147: bytes=32 time=44ms TTL=48

Reply from 209.85.227.147: bytes=32 time=28ms TTL=48

Reply from 209.85.227.147: bytes=32 time=40ms TTL=48

Reply from 209.85.227.147: bytes=32 time=29ms TTL=48



Ping statistics for 209.85.227.147:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 28ms, Maximum = 44ms, Average = 35ms

</p>

    </body>

</html>

And the actual string shown on the webpage:

Pinging www.l.google.com [209.85.227.147] with 32 bytes of data: Reply from 209.85.227.147: bytes=32 time=30ms TTL=48 Reply from 209.85.227.147: bytes=32 time=29ms TTL=48 Reply from 209.85.227.147: bytes=32 time=28ms TTL=48 Reply from 209.85.227.147: bytes=32 time=31ms TTL=48 Ping statistics for 209.85.227.147: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 28ms, Maximum = 31ms, Average = 29ms

After extensive Googling all I can find is people who are not using nl2br() when they should be

What am I missing here?

我只是在尝试使用PHP来为一些即将开展的项目做好准备，而且我遇到了一个赢了的字符串' 即使它是一个多行字符串，也会将＆lt; br /＆gt; code>插入其中。 p>

代码很简单PHP（我附上了在简单的html标签中） p>


  $ ping = passthru（'ping www.google.com'）; 
 $ ping = htmlspecialchars_decode（$ ping）; 
 $ ping =  strip_tags（$ ping）; 
 $ ping = nl2br（$ ping）; 
echo $ ping; 
  code>  pre> 
 
 结果是一个多行字符串但没有任何字符串 添加了＆lt; br /＆gt;  code>标签，但是，页面源将结果显示为多行字符串，因此肯定有多行，但 nl2br（） code>没有做 任何事情。 p> 
 
 
页面源（当我在这里粘贴时神秘地添加了额外的空白行） p> 
 
 

 ＆lt; html＆gt; 
  
＆lt; head＆gt; 
 
＆lt; title＆gt; Derp＆lt; / title＆gt; 
 
 
 
＆lt; / head＆gt; 
 
＆lt; body＆gt;＆lt;  ; p> 
 
 
 
使用32个字节的数据访问www.l.google.com [209.85.227.147]：
 
从209.85.227.147开始：字节= 32次= 44ms TTL = 48 
 \  nReply自209.85.227.147：字节= 32时间= 28ms TTL = 48 
 
从209.85.227.147开始：字节= 32时间= 40ms TTL = 48 
 
从209.85.227.147开始：字节= 32时间= 29ms TTL =  48 
 
 
 
 
 
的统计数据为209.85.227.147:
nn数据包：已发送= 4，已接收= 4，已丢失= 0（0％丢失），
 
近似的往返时间（以毫秒为单位）：  
 
最小值= 28毫秒，最大值= 44毫秒，平均值= 35毫秒
 
＆lt; / p＆gt; 
 
＆lt; / body＆gt; 
 
＆lt; / html＆gt; 
  code>  pre>  
 
 网页上显示的实际字符串： p> 
 
 
 使用32个字节的数据Ping www.l.google.com [209.85.227.147]：回复 来自209.85.227.147：bytes = 32 time = 30ms TTL = 48来自209.85.227.147的回复：bytes = 32 time = 29ms TTL = 48来自209.85.227.147的回复：bytes = 32 time = 28ms TTL = 48来自209.85.227.147的回复：  bytes = 32 time = 31ms TTL = 48 209.85.227.147的Ping统计信息：数据包：已发送= 4，已接收= 4，已丢失= 0  （0％损失），以毫秒为单位的近似往返时间：最小值= 28毫秒，最大值= 31毫秒，平均值= 29毫秒
  code>  pre> 
 
 经过广泛的Google搜索后，我可以找到所有内容 是那些没有使用 nl2br（） code>的人 p> 
 
 
我在这里缺少什么？ p> 
  div>

答

<?php 
$ping = `ping www.google.com`;
$ping = nl2br($ping);
echo $ping;
?>

<br />
Pinging www.l.google.com [209.85.147.104] with 32 bytes of data:<br />
<br />
Reply from 209.85.147.104: bytes=32 time=24ms TTL=53<br />
Reply from 209.85.147.104: bytes=32 time=23ms TTL=53<br />
Reply from 209.85.147.104: bytes=32 time=23ms TTL=53<br />
Reply from 209.85.147.104: bytes=32 time=25ms TTL=53<br />
<br />
Ping statistics for 209.85.147.104:<br />
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),<br />

Approximate round trip times in milli-seconds:<br />
    Minimum = 23ms, Maximum = 25ms, Average = 23ms<br />

答

You're misunderstanding what passthru($cmd) does. It executes $cmd, but sends stdout directly to the browser - you do not get the results back as a string. Instead, it returns the return code of the called $cmd.

If you want to capture output, use exec, and pass an $output array by reference.

使用nl2br混淆Php函数结果

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