如何传递价值和PHP运行C程序（Web应用程序） [英] How to pass value and run c program in php( web application)

问题描述

我有很大的 C program.I想要在PHP执行该功能，并获得价值

I am having big c program.I want execute that function in php and get value

例如

C程序

int add( int, int);         

void main()
{
  int i=1;
  printf("i starts out life as %d.", i);

  i = add(5, 10);           

  printf(" And becomes %d after function is executed.\n", i);
}


int add( int a, int b)          
{
  int c;
  c = a + b;
  return c;
}

我的网页形式都有价值a和b。所以，当我提交表单我想打电话给C函数添加和
得到的输出。

my web form has value a and b. so when i submit form i want to call the c function add and get the output.

我知道有执行在PHP外部程序功能
像

I know there is a function to execute external programs in php like

exec()
shell_exec()

但我不熟悉这个functions.so请给我code的样本。如果我把C程序文件（在记事本中）在服务器的根目录文件夹中。

But i am not familiar with this functions.so please give me sample of code. Should i place the c program file(in notepad) in server root folder.

请指导我！
在此先感谢

Please guide me ! Thanks in advance

推荐答案

我想最简单的方法是调用从PHP的C，传递
参数作为参数。在C面：

I guess the simplest way would be to call your C from PHP, passing the parameters as arguments. On the C side:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int i = add(atoi(argv[1]), atoi(argv[2]));
    printf("%d\n", i);
    return 0;
}

（显然，你应该添加错误检查）。在PHP端：

(obviously, you should add error checking). On the PHP side:

$a = ...;
$b = ...;
$c = exec("/path/to/sum $a $b");

假设你的C程序被称为总和。

assuming your C program is called sum.

编辑：只要添加一个关于有各种办法评论
为您推荐至今：

Just adding a comment about the various approaches that have been suggested to you so far:

• 与 EXEC开始你的C程序（），如上面我的回答是
  真的是简单的解决方案。但是，它的成本你的创作
  新的进程每次调用你的C code时，它可以是昂贵的
  如果你这样做了很多。

• Starting your C program with exec(), as in my answer above, is really the simplest solution. However, it costs you the creation of a new process every time you call your C code, which can be expensive if you do it a lot.

一个PHP扩展免去了进程创建和应多
高效，特别是如果你到C code使得许多电话和
你的C code是快速计算出结果。

A PHP extension spares the process creation and should be more efficient, especially if you are making many calls to your C code and your C code is fast to compute the result.

一个守护进程是比较有趣的，如果你的C程序慢启动
（长初始化），但随后快速处理查询。

A daemon is more interesting if your C program is slow to startup (long initialization) but can then process queries fast.

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