訪問php類中公共函數中的數組元素

Question

試圖弄清楚如何在 PHP 類中使用公共函數處理數組元素。 已經查看過類似的問題，但無法解決問題。 以下是我到目前為止所擁有的。

class myClass
{
    public $inputNumber = 27;
    public $inputArray = array(1, 2, 4);
    public $outputArray = array($inputArray[0]*$inputNumber, $inputArray[1]*$inputNumber, $inputArray[2]*$inputNumber);

    public function printOutput()
    {
        return "1st value is " . $this->outputArray[0] . "<br>";
        return "2nd value is " . $this->outputArray[1] . "<br>";
        return "3rd value is " . $this->outputArray[2] . "<br>";
    }
}

$obj = new myClass;

echo $obj->printOutput();

Answer 1

您還可以使用定義的值。 其他明智的好處是傳入構造函數

<?php

class myClass
{
public $inputNumber = 27;
public $inputArray = array(1, 2, 4);
public $outputArray = array();

function __construct() {
   $this->outputArray= array($this->inputArray[0]*$this->inputNumber, 
                             $this->inputArray[1]*$this->inputNumber, 
                             $this->inputArray[2]*$this->inputNumber
                             );
}
public function printOutput()
{
    $output = "1st value is " . $this->outputArray[0] . "<br>";
    $output .= "2nd value is " . $this->outputArray[1] . "<br>";
    $output .= "3rd value is " . $this->outputArray[2] . "<br>";
    return $output;
 }
}

$obj = new myClass;
echo $obj->printOutput();

這里是運行片段： https : //ideone.com/miOQJB

Answer 2

class myClass
{
    public $inputNumber = (int) 27;
    public $inputArray = array();
    public $outputArray = array();

   function __construct($inputNumber = 27, $inputArray = array(1,2,4)) {
       $this->inputNumber = (int) $inputNumber;
       $this->inputArray = (array) $inputArray;
       $this->outputArray= array($this->inputArray[0]*$this->inputNumber, $this->inputArray[1]*$this->inputNumber, $this->inputArray[2]*$this->inputNumber);
    }

    public function printOutput()
    {
        return "1st value is " . $this->outputArray[0] . "<br>"
        . "2nd value is " . $this->outputArray[1] . "<br>"
        . "3rd value is " . $this->outputArray[2] . "<br>";
    }
}

$obj = new myClass;

echo $obj->printOutput();