在 PHP 中创建静态方法并调用该方法

Question

我通过创建对象从 Form 类中获取值。它工作正常。但我想使用静态方法。我尝试但没有成功。

public function display()
{
    $newform=new Form();

    echo "<pre>";
    var_dump($newform->getAll());

    var_dump($newform->get('name'));
}

<?php 

class Form
{
    private $value = array();

    function __construct() {
        // here you can use some validation or escapes 
        foreach($_POST as $key=>$value)
            $this->value[$key] = $value;

    }

    public function getAll() {
        return $this->value;
    }

    public function get($value) {
        $this->value = $_POST[$value];

        return $this->value;
    }

}

Answer 1

也许您应该尝试阅读PHP documentation about static keyword？

例子：

class Form {

    private static $value = array();

    public static function factory() {
        // here you can use some validation or escapes 
        foreach($_POST as $key => $value) {
            static::$value[$key] = $value;
        }
    }

    public static function getAll() {
        return static::$value;
    }

    public static function get($key) {
        return static::$value[$key];
    }

}

用途：

public function display() {
    Form::factory();

    echo "<pre>";
    var_dump(Form::getAll());
    var_dump(Form::get('name'));
    echo "</pre>";
}

Answer 2

您没有在类之外将函数声明为 public/private/protected

你想静态调用这个方法，你可以试试

<?php
     function display()
{
    $newform=new Form($_POST);

    echo "<pre>";
    var_dump(Form::getAll());

    var_dump(Form::get('name'));
}

class Form
{
private static $value = array();
function __construct(){
// here you can use some validation or escapes 
function __constract($array){
    foreach($array as $key=>$value)
        self::$value[$key] = $value;

    }
}
public static function getAll(){

    return self::$value;
}
public static function get($value){

        self::$value = self::$value[$value];

    return self::$value;
}

}

Answer 3

这是getAll 方法的示例。对于get 方法同样的想法：

public function display()
{
    var_dump(Form::getAll());
}

class Form
{
    private static $value = array();
   public static function initPost()
    {
        foreach($_POST as $key=>$value)
        self::$value[$key] = $value;
    }
    public static function getAll()
    {
        return self::$value;
    } 
}