Question

为什么我会收到此错误？

警告：implode（）：第17行/Applications/XAMPP/xamppfiles/htdocs/basis/php/php.php中传递的参数无效

的index.php：

<?php


require_once 'php.php';
$piet = new Persoon();
$piet->voornaam = 'Piet';
$piet->achternaam = 'Jansen';
echo "De naam is: " . $piet->showNaam();

$piet->addHobby('zeilen');
$piet->addHobby('hardlopen');
echo "<br/> De hobbies van {$piet->showNaam()} zijn: {$piet->showHobbies()}";

?>

php.php

<?php
    class Persoon {
        public $voornaam = '';
        public $achternaam = '';
        protected $adres;
        protected $hobbies;

        public function showNaam() {
            return $this->voornaam . ' ' . $this->achternaam;
        }

        public function addHobby($hobby) {
            $hobbies[] = $hobby;
        }

        public function showHobbies() {
            echo implode(', ', $this->hobbies);
        }
    }

?>

Answer 1

在sudo apt-get install mysql-server方法中，您必须使用addHobby()代替$this->hobbies。最好使用空数组初始化$hobbies以防止错误。

hobbies

Answer 2

变量访问错误。

<?php
class Persoon {
    public $voornaam = '';
    public $achternaam = '';
    protected $adres;
    protected $hobbies;

    public function showNaam() {
        return $this->voornaam . ' ' . $this->achternaam;
    }

    public function addHobby($hobby) {
        $this->hobbies[] = $hobby; <--- change this
    }

    public function showHobbies() {
        //echo implode(', ', $this->hobbies);// remove this
        echo count($this->hobbies) ? implode(', ', $this->hobbies) : "";// this will avoid errors in future if your array is empty.
    }
}

?>

Answer 3

每次调用addHobby（$ hobby）函数时，您的代码都在创建一个新数组，您需要做的就是正确访问它。改变

public function addHobby($hobby) {
            $hobbies[] = $hobby;
        }

到

 public function addHobby($hobby) {
            $this->hobbies[] = $hobby;

        }

无法解决＆＃39;传递的无效参数＆＃39;

3 个答案: