PHP 在 class if 语句中声明方法

Question

在 PHP 中，是否可以仅在语句为真时在 class 中声明方法：

class MyClass {

    //...
    
   
    if (mode === 'production'):
    public function myMethod() {
        // My cool stuffs here        
    }
    endif;
}

Answer 1

You can limit your function work by creating object and calling the method of your class through your condition. For example,

class MyClass {
    public function myMethod() {
        // My cool stuffs here
        return 'Hello there';
    }
}

$myObj = new MyClass();
$mode = 'production';
if ($mode === 'production'):
    echo $myObj->myMethod();
endif;

Even you can use the constructor method and pass the $mode value and then return value only condition is true.

class MyClass {
    private $mode;
    function __construct($mode) {
        $this->mode = $mode;
    }
    public function myMethod() {
        // My cool stuffs here
        if($this->mode == 'production'){
            return 'Hello there';
        }
        return '';
    }
}

$myObj = new MyClass('production');
echo $myObj->myMethod();

Answer 2

不可以，但肯定有一些替代解决方案，例如使用继承。

PHP 在 class if 语句中声明方法

PHP Declare method in class if statement

php

methods

if-statement