Question

我尝试打印数组$array1，但它显示错误消息为

注意：未定义的变量：第16行的D：\ xampp \ htdocs \ trainig \ Day4 \ accessmod.php中的array1警告：在D：\ xampp \ htdocs \ trainig \ Day4 \ accessmod中为foreach（）提供的参数无效。第16行的PHP

<?php 
    class AccessMode
    {
    public $integer_member = 1;
    protected $float_number = 2.5;
    private $string = "Tony";
    public $array1 = [5, 7, 9];
    function print_properties(){
        echo "public integer: ".$this->integer_member;
        echo "<br>";
        echo "protected float: ".$this->float_number;
        echo "<br>";
        echo "private string: ".$this->string;
        echo "<br>";
        echo "public array: ";
        foreach ($array1 as $av){
            echo $av." ";  
        }

       }

    }
     $a = new AccessMode();
    echo "<br>";
    echo " From AccessMode class <br>";
    $a->print_properties();
    ?>

Answer 1

您想要访问类成员而不是变量，因此您需要使用$this。代码应该是：

foreach ($this->array1 as $av) {

然后输出是：

From AccessMode class
public integer: 1
protected float: 2.5
private string: Tony
public array: 5 7 9

代码是：

<?php
class AccessMode
{
    public $integer_member = 1;
    protected $float_number = 2.5;
    private $string = "Tony";
    public $array1 = [5, 7, 9];

    function print_properties()
    {
        echo "public integer: " . $this->integer_member;
        echo "<br>";
        echo "protected float: " . $this->float_number;
        echo "<br>";
        echo "private string: " . $this->string;
        echo "<br>";
        echo "public array: ";
        foreach ($this->array1 as $av)
        {
            echo $av . " ";
        }

    }

}

$a = new AccessMode();
echo "<br>";
echo " From AccessMode class <br>";
$a->print_properties();
?>

我试图打印数组$ array1但它显示错误消息

1 个答案: