在类中输入数组后没有返回任何内容

Question

我试图将值输入到类数组中，然后从类中输出该数组，但我从echo中得不到任何内容。谢谢你的建议。

<?php
class Packing{

    public $boxList;    
    public function getBoxlist() {
        return $boxList;
    }

    public function addBox($name,$weightLimit){
        $this->boxList = array($name, $weightLimit);
    }
}
?>

test

<?php
    $package = new Packing();
    $package->addBox("RedBox","30");
    $package->addBox("GreenBox","40");
    echo $package->getBoxlist();
?>

Answer 1

1. 应该是这样，使用$this->boxList代替$boxList

   public function getBoxlist() {
     return $this->boxList;
   }
   

2. 您正在覆盖boxList值

3. 其数组不是文字，因此请使用print_r而不是echo

   print_r($package->getBoxlist());
   

点击此处：https://eval.in/752903

来自https://eval.in/752907

的演示

<?php
class Packing{

    public $boxList =  array();    
    public function getBoxlist() {
        return $this->boxList;
    }

    public function addBox($name,$weightLimit){
        $this->boxList[] = array($name, $weightLimit);
    }
}
    $package = new Packing();
    $package->addBox("RedBox","30");
    $package->addBox("GreenBox","40");
    print_r($package->getBoxlist());
?>