How to find a certain value in php and print it out?

I have used preg_match to find a certain string. If there is xxx, I will display it as xxx
This is what I decided. As long as the string matches
But what I want to know now is
How to print a certain string?
Because the string will change, I want to print it out
I use PHP's HTTP USER AGENT to detect the device's data

Assume this paragraph

<code>Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36</code>

I want to print out Mac OS X 10_10_5 and display it as Mac OS X 10.10.5

and

<pre class="brush:php;toolbar:false">&lt;code&gt;Mozilla/5.0 (Linux; Android 4.4.2; ASUS_T00G Build/KVT49L) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36&lt;/code&gt;</pre>

I want to print out Android 4.4.2 and ASUS_T00G

and the last

<pre class="brush:php;toolbar:false">&lt;code&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D257 Safari/9537.53&lt;/code&gt;</pre>

In addition to printing out iPhone, I also want to print out OS 7_1_2 and display it as OS 7.1.2
How to detect this?
I will judge that if there is Intel Mac OS Those strings I described
How to judge this?


Reply content:

I have used preg_match to find a certain string. If there is xxx, I will display it as xxx. This is what I decided. As long as the string matches

But what I want to know now is

How to print a certain string?

Because the string will change, I want to print it out
I use PHP's HTTP USER AGENT to detect the device's data

Assume this paragraph

<code>Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36</code>

I want to print out Mac OS X 10_10_5

and display it as

Mac OS X 10.10.5

and <pre class="brush:php;toolbar:false">&lt;code&gt;Mozilla/5.0 (Linux; Android 4.4.2; ASUS_T00G Build/KVT49L) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36&lt;/code&gt;</pre> I want to print out

Android 4.4.2

and

ASUS_T00G

and the last <pre class="brush:php;toolbar:false">&lt;code&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D257 Safari/9537.53&lt;/code&gt;</pre> In addition to printing out iPhone, I also want to print out

OS 7_1_2

and display it as

OS 7.1.2

How to detect this? I will judge that if there is Intel Mac OS Those strings I described How to judge this?

Look at this:
https://my.oschina.net/junn/b...