如何在mysqli连接中使用$ this？

Question

我在 connections.php 中声明了mysqli连接。我声明 $ this-＆gt;连接而不是 $ connect ，因为我想将一个文件中的每个函数分开。

<?php
$this->connection = mysqli_connect("localhost","root","","itdforum");

        if(mysqli_connect_errno){
            echo "Failed to connect to MYSQL: " . mysqli_connect_error();
        }
?>    

我试图在其他功能中使用 $ this-connection

<?php
include("connections.php");
    function getSome(){

        $get_some = "SELECT * FROM table"
        $run_some = mysqli_query($this->connection, $get_some);
    }
?>

但错误显示如下

Using $this when not in object context in localhost\connections.php

有谁知道如何修复它？或者我只是将所有功能添加到一个php文件中？谢谢。

Answer 1

听起来你想要一堂课：

class Thing {
    function __construct(){
        $this->connection = mysqli_connect(...)
        if(mysqli_connect_errno){
            echo "Failed to connect to MYSQL: " . mysqli_connect_error();
        }
    }

    function getSome(){
        $get_some = "SELECT * FROM table"
        $run_some = mysqli_query($this->connection, $get_some);
    }

}

使用它：

include('Thing.php');

$thing = new Thing();

$thing->getSome();