Let’s take a look at the detailed explanation and examples of golang calling php7

Execute the php file

func Test_exec(t *testing.T) {
  engine.Initialize()
  ctx := &engine.Context{
    Output: os.Stdout,
  }
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  err = ctx.Exec("/tmp/index.php")
  if err != nil {
    fmt.Println(err)
  }
}

The content of /tmp/index.php is

<?php
echo("hello\n");

Eval, return value

func Test_eval(t *testing.T) {
  engine.Initialize()
  ctx := &engine.Context{}
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  val, err := ctx.Eval("return 'hello';")
  if err != nil {
    fmt.Println(err)
  }
  defer engine.DestroyValue(val)
  if engine.ToString(val) != "hello" {
    t.FailNow()
  }
}

The life cycle ownership of the returned value is the golang program, so we are responsible for the DestroyValue

setting Use global variables to pass parameters

func Test_argument(t *testing.T) {
  engine.Initialize()
  ctx := &engine.Context{}
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  err = ctx.Bind("greeting", "hello")
  if err != nil {
    fmt.Println(err)
  }
  val, err := ctx.Eval("return $greeting;")
  if err != nil {
    fmt.Println(err)
  }
  defer engine.DestroyValue(val)
  if engine.ToString(val) != "hello" {
    t.FailNow()
  }
}

The life cycle of the parameters passed in is controlled by PHP, and the memory will be released when the request is shut down.

PHP callback Golang

type greetingProvider struct {
  greeting string
}

func (provider *greetingProvider) GetGreeting() string {
  return provider.greeting
}

func newGreetingProvider(args []interface{}) interface{} {
  return &greetingProvider{
    greeting: args[0].(string),
  }
}

func Test_callback(t *testing.T) {
  engine.Initialize()
  ctx := &engine.Context{}
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  err = engine.Define("GreetingProvider", newGreetingProvider)
  if err != nil {
    fmt.Println(err)
  }
  val, err := ctx.Eval(`
  $greetingProvider = new GreetingProvider('hello');
  return $greetingProvider->GetGreeting();`)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.DestroyValue(val)
  if engine.ToString(val) != "hello" {
    t.FailNow()
  }
}

PHP error log

func Test_log(t *testing.T) {
  engine.PHP_INI_PATH_OVERRIDE = "/tmp/php.ini"
  engine.Initialize()
  ctx := &engine.Context{
    Log: os.Stderr,
  }
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  _, err = ctx.Eval("error_log('hello', 4); trigger_error('sent from golang', E_USER_ERROR);")
  if err != nil {
    fmt.Println(err)
  }
}

Among them/tmp/php.ini## The content of # is

error_reporting = E_ALL
error_log = "/tmp/php-error.log"

and errors will be output to /tmp/php-error.log. Directly calling error_log will simultaneously output another copy to stderr

HTTP input and output

func Test_http(t *testing.T) {
  engine.Initialize()
  recorder := httptest.NewRecorder()
  ctx := &engine.Context{
    Request: httptest.NewRequest("GET", "/hello", nil),
    ResponseWriter: recorder,
  }
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  _, err = ctx.Eval("echo($_SERVER['REQUEST_URI']);")
  if err != nil {
    fmt.Println(err)
  }
  body, err := ioutil.ReadAll(recorder.Result().Body)
  if err != nil {
    fmt.Println(err)
  }
  if string(body) != "/hello" {
    t.FailNow()
  }
}

All PHP super global variables will be initialized to the value of the Request passed in. Including the content of

$_SERVER
$_GET
$_POST
$_FILE
$_COOKIE
$_ENV

echo, http code and http header will be written back to the incoming ResponseWriter

fastcgi_finish_request
##PHP- A very commonly used function of FPM is fastcgi_finish_request, which is used to do some asynchronous things in PHP. This special global function must support

func Test_fastcgi_finish_reqeust(t *testing.T) {
  engine.Initialize()
  buffer := &bytes.Buffer{}
  ctx := &engine.Context{
    Output: buffer,
  }
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  ctx.Eval("ob_start(); echo ('hello');")
  if buffer.String() != "" {
    t.FailNow()
  }
  ctx.Eval("fastcgi_finish_request();")
  if buffer.String() != "hello" {
    t.FailNow()
  }
}

The actual function is to output the output to ResposneWriter in advance to let the caller know the result. It actually has no impact on the execution of the current process, but only affects the output.

Related learning recommendations:

PHP7 tutorial

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