正确 class 加载 PHP

Question

我正在 PHP 学习 OOP，我遇到了正确加载 classes 的问题。我在 HTML 文件中有一个注册表，其中的数据由 PHP 脚本处理。我有一个 parent class 和几个 children class，每个都在不同的文件中。我想将每个 child classes 自动加载到 parent.

这是我的 parent class，我在其中初始化 child object。

<?php

spl_autoload_register(function ($class) { /*load the child class*/
    include $class . '.php';
});

$addTxt = new AddTxt(); /*init child class object*/

class Validator {
    public $name  = 'name ';
    public $s_name  = 's_name ';
    public $email = 'email ';
    public $ticket = 'ticket ';
    function __construct(){
        $this->name = $_POST['name'];
        $this->s_name = $_POST['s_name'];
        $this->email = $_POST['email'];
        $this->ticket = $_POST['ticket'];
    }
}

$validate = new Validator();

这是一个childclass

<?php

class AddTxt extends Validator {
    public $string = "test";
    public $file;
    public $date;
    function __construct(){
        parent::__construct();
        $this->date = date('d_m_Y');
        $this->file = 'registration_' . $this->date . ".txt";
        $this->string = $this->name . " " . $this->s_name . " " . $this->email . " " . $this->ticket . PHP_EOL;
    }
    function addLine(){
        if(file_exists($this->file)){
            $f = fopen($this->file, "a+") or die ("Error");

            if (($f) && filesize($this->file)) {
                $lines = explode("\n", fread($f, filesize($this->file)));

                foreach($lines as $line){
                    $l = explode(" ", $line);
                    $line_items[] = $l[2];
                }
                foreach ($line_items as $item) {
                    if($item === $this->email) {
                        die ("such email already exist");
                    }
                }
                fwrite($f, $this->string);
            }
            else {
                fwrite($f, $this->string);
            }

            fclose($f);
        }
        if(!file_exists($this->file)) {
            $f = fopen($this->file, "a+") or die ("Error");

            fwrite($f, $this->string);

            fclose($f);
        }
    }
}


$addTxt = new AddTxt();/*another one child class init*/
$addTxt->addLine()

如你所见，child class 的 object 被初始化了两次，否则，我得到这个错误 Call to a member function addLine () on a non-object，就像我没有创建一个object。在我看来，这是错误的方法。我只想初始化 object 一次。告诉我如何正确连接 classes？有没有更好的方法来加载和初始化 classes?

Answer 1

您不应在与 class 相同的文件中初始化 class。将您的 classes 移动到他们自己的文件中。

Validator.php

<?php

class Validator {
    public $name  = 'name ';
    public $s_name  = 's_name ';
    public $email = 'email ';
    public $ticket = 'ticket ';

    function __construct(){
        $this->name = $_POST['name'];
        $this->s_name = $_POST['s_name'];
        $this->email = $_POST['email'];
        $this->ticket = $_POST['ticket'];
    }
}

AddTxt.php

<?php

class AddTxt extends Validator {
    public $string = "test";
    public $file;
    public $date;
    function __construct(){
        parent::__construct();
        $this->date = date('d_m_Y');
        $this->file = 'registration_' . $this->date . ".txt";
        $this->string = $this->name . " " . $this->s_name . " " . $this->email . " " . $this->ticket . PHP_EOL;
    }
    function addLine(){
        if(file_exists($this->file)){
            $f = fopen($this->file, "a+") or die ("Error");

            if (($f) && filesize($this->file)) {
                $lines = explode("\n", fread($f, filesize($this->file)));

                foreach($lines as $line){
                    $l = explode(" ", $line);
                    $line_items[] = $l[2];
                }
                foreach ($line_items as $item) {
                    if($item === $this->email) {
                        die ("such email already exist");
                    }
                }
                fwrite($f, $this->string);
            }
            else {
                fwrite($f, $this->string);
            }

            fclose($f);
        }
        if(!file_exists($this->file)) {
            $f = fopen($this->file, "a+") or die ("Error");

            fwrite($f, $this->string);

            fclose($f);
        }
    }
}

index.php

<?php

spl_autoload_register(function ($class) { /*load the child class*/
    include $class . '.php';
});

$addTxt = new AddTxt();
$addTxt->addLine();

Answer 2

如果你有一个class文件，里面应该只有class，没有代码。所以在你的情况下你基本上有文件：

Validator.php

class Validator { ... }

AddTxt.php

class AddTxt extends Validator { ... }

index.php

<?php

spl_autoload_register(function ($class) { /*load the child class*/
    include $class . '.php';
});

$addTxt = new AddTxt();
$addTxt->addLine();

正确 class 加载 PHP

Correct class loading PHP

php

autoload

Validator.php

AddTxt.php

index.php