Exploring PHP's built-in Web Server (2) Customizing the PHP console output console function

We are developing the server side of the APP. When jointly debugging with the APP, we usually need to track the reception of URL requests and parameters in real time.

But PHP does not have a proprietary console output function like Python or Java, Python’s print() and Java’s System.out.println(), PHP’s echo, print and other functions can be used directly using php -f index.php When cli_server is running, it can be printed on the shell screen, but when cli_server is running, the debugging information is only printed on the shell and not displayed in the browser.

After searching for a long time using Du Niang, there is very little information on PHP's built-in server cli mode on the Internet, and I can't find any useful information at all.

By consulting PHP official documentation, I finally thought of PHP’s standard output streamSTDOUT

　php://output is a write-only data stream that allows you to write to the output buffer in the same way as print and echo

When running in cli mode, as long as data is written to STDOUT, it will be printed to the SHELL client immediately without echo or print:

So, we can write a custom function to encapsulate the Inputting data from the sdtout standard output stream is equivalent to printing the scheduling information you want to display to the shell at any time:

<span><span>1</span><span>/*</span><span>2</span><span>* cli模式或者内置server打印调试信息，而不在浏览器输出
</span><span>3</span><span>* param fixed $data    参数可以是除了对象以外的所有数据类型，比如：字符串，数组，jason等
</span><span>4</span><span>*/</span><span>5</span><span>function</span> console(<span>$data</span><span>){
</span><span>6</span><span>$stdout</span> = <span>fopen</span>('php://stdout', 'w'<span>);
</span><span>7</span><span>fwrite</span>(<span>$stdout</span>,json_encode(<span>$data</span>)."\n");   <span>//</span><span>为了打印出来的格式更加清晰，把所有数据都格式化成Json字符串</span><span>8</span><span>fclose</span>(<span>$stdout</span><span>);
</span><span>9</span> }</span>

When you need to print the current debugging information after each request of the built-in Server: call console() directly For example:

Print all received GET or POST parameters:

console($_GET);

console($_POST);

Print string:

console("hello php console debug");

No longer need to envy the console output of Python and Java, PHP also has a console output function from now on

The above introduces the exploration of PHP's built-in Web Server (2) Customizing the PHP console output console function, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.