如何從php中的另一個類文件調用函數

Question

我有一個Response.php文件，里面有一個函數，我想將該函數調用到另一個.php文件。

這是Response.php

<?php
include 'connection.php';
$response = array();
class Response_Function{
 public function fieldMissing() {
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";
    $response = json_encode($response);

    echo $response;
    }
}

?>

這是調用fieldMissing()函數的文件

<?php
include 'connection';
require_once 'include/Response.php';
$db = new Response_Function();
$response = $db->fieldMissing();
echo $response;
?>

Answer 1

就像BrianDHall說，你的工作，你需要更換echo與return

Answer 2

您的代碼有兩個問題：

1）響應數組應聲明為INSIDE函數（但是如果你需要從類中的其他地方訪問它，請聲明它並將其用作INSIDE類的類屬性）;

2）正如其他人指出的那樣，函數的最后一條指令應該是返回值而不是打印它。

總而言之，您的Response.php文件應如下所示：

<?php
include 'connection.php';
class Response_Function{
  public function fieldMissing() {
    $response = array();
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";
    $response = json_encode($response);

    return $response;
  }
}

Answer 3

你不應該在函數中回顯總是使用return而是讓調用者回應它需要的任何地方。

Response.php

    <?php

    include 'connection.php';

    class Response_Function
    {

        public $response;

        public function fieldMissing() {

            $response["success"] = 0;
            $response["message"] = "Required field(s) is missing";

            $this->response = json_encode($response);

    }
}

調用函數fieldMissing（）的文件

   <?php

   include 'connection';
   require_once 'include/Response.php';

   $db = new Response_Function();
   $db->fieldMissing(); 

   $response = json_decode($db->response);

   echo $response->message;

  ?>