在子类问题中设置父类变量

Question

调用getLivePath();和getDevPath();方法时，为什么文件名不包含在路径中？

<?php
class supplierImport {
var $_supplierFilename = '';
var $_fileName = '';
var $_livePath = '/var/www/vhosts/myshop.co.uk/httpdocs/_import/';
var $_devPath = '/var/www/web-ecommerce/www/_import/';

function supplierImport($supplier){
switch($supplier){
case 'birlea';
$birlea = new birlea();
break;
case 'julianbowen';
$julianbowen = new julianbowen();
default;
echo 'Supplier not available';
break;
}
}
function getLivePath(){
return $this->_livePath.'/'.$this->_fileName;
}
function getDevPath(){
return $this->_devPath.'/'.$this->_fileName;
}
}

class birlea extends supplierImport {
function birlea(){
$this->_fileName = 'birlea_stock.csv';
}
}
class julianbowen extends supplierImport {
function julianbowen(){
$this->_fileName = 'julianbowen_stock.csv';
}
}
$supplierImport = new supplierImport('birlea');
echo $supplierImport->getLivePath();
echo $supplierImport->getDevPath();

这是我得到的输出：

/var/www/vhosts/myshop.co.uk/httpdocs/_import///var/www/web-ecommerce/www/_import//

示例代码：

http://sandbox.onlinephpfunctions.com/code/435a4b25db44d2c8bb33ff6aa2d96c6db21ef177

Answer 1

您正在扩展基类，因此必须实例化正在扩展基类的类。然后，扩展类将运行其构造函数，正确设置值。

<?php
class supplierImport {
var $_supplierFilename = '';
var $_fileName = '';
var $_livePath = '/var/www/vhosts/myshop.co.uk/httpdocs/_import/';
var $_devPath = '/var/www/web-ecommerce/www/_import/';
function getLivePath(){
return $this->_livePath.$this->_fileName;
// removed unnecesary `.'/'.`
}
function getDevPath(){
return $this->_devPath.$this->_fileName;
// removed unnecesary `.'/'.`
}
}

class birlea extends supplierImport {
function birlea(){
$this->_fileName = 'birlea_stock.csv';
}
}
class julianbowen extends supplierImport {
function julianbowen(){
$this->_fileName = 'julianbowen_stock.csv';
}
}
$birlea = new birlea();
echo 'Birlea Live = ' . $birlea->getLivePath();
echo PHP_EOL;
echo 'Birlea Dev = ' . $birlea->getDevPath();
echo PHP_EOL;
$julian = new julianbowen();
echo 'Julian LIVE = ' . $julian->getLivePath();
echo PHP_EOL;
echo 'Julian DEV = ' . $julian->getDevPath();

结果

Birlea Live = /var/www/vhosts/myshop.co.uk/httpdocs/_import/birlea_stock.csv
Birlea Dev = /var/www/web-ecommerce/www/_import/birlea_stock.csv
Julian LIVE = /var/www/vhosts/myshop.co.uk/httpdocs/_import/julianbowen_stock.csv
Julian DEV = /var/www/web-ecommerce/www/_import/julianbowen_stock.csv