Problems related to proc_open + fwrite application in php

In php, proc_open + fwrite application problems I want to use proc_open in php to call a c ++-written exe program. because it requires the input of parameters, I use fwrite to write data to the terminal, the php code is as follows: PHPcode & lt ;? Php $ descriptorspec = array (0 = & gt; array (& quot; proc_open + fwrite application problems in php
I want to use proc_open in php to call an exe program written in c ++. because the input parameters are required, I use fwrite to write the program to the terminal. The php code is as follows:

PHP code

  
   array("pipe", "r"),  // stdin is a pipe that the child will read from   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to   2 => array("file", "error-output.txt", "a") // stderr is a file to write to);$process = proc_open("d:\\64test.exe", $descriptorspec, $pipes);if (is_resource($process)) {    // $pipes now looks like this:    // 0 => writeable handle connected to child stdin    // 1 => readable handle connected to child stdout    // Any error output will be appended to /tmp/error-output.txt        fwrite($pipes[0], "q");    fclose($pipes[0]);    while (!feof($pipes[1]))     {        $result = fgets($pipes[1], 1024);        echo "r:$result
";    }    fclose($pipes[1]);        // It is important that you close any pipes before calling    // proc_close in order to avoid a deadlock    $return_value = proc_close  ($process);    echo "command returned $return_value
";}?>

The c ++ code is as follows:

C/C ++ code

  #include 
  
   using namespace std;int main(int argc,char *argv[]){    char buf[1024]={0};    /*fgets(buf,sizeof(buf),stdin);*/    while(buf[0]!='q')    {        std::cin>>buf;        std::cout<
   
  

The above c ++ is a simplified code
(1) The problem is that the code in my c ++ is a while loop that requires continuous input.
Ask how to write data in php. Currently, only fwrite ($ pipes [0], "q") can be used in php, but not in php.
(2) the above program can be printed normally.
R: q
Command returned-3
I always print the following in another very complex cpp program:
R:
Command returned-1073741515
Later, I commented out other codes in main and directly copied the simple c ++ code above to my project. The result is still above. this is my biggest question, has anyone ever met?

Thank you!

------ Solution --------------------
Fwrite ($ pipes [0], "cmd1 \ ncmd2 \ ncmd3 \ nq"); try it
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What do you mean?
It allows you to assemble the output data into strings and then output the data at one time.