对于依赖注入 我现在的理解是把一个方法当成一个变量放进另一个方法的形参里
<?php
class Factory {
public static function getDb(){
return new Db();
}
} class Db {
public static function query($sql){
echo $sql;
}
public static function querys($sql){
echo $sql."s";
}
} class example {
private $_db;
function getList(){
$this->_db->query("123");//这里具体sql语句就省略不写了
}
//从外部注入db连接
function setDb($connection){
$this->_db = $connection;
}
}
//调用
$example = new example();
$example->setDb(Factory::getDb());//注入db连接
$example->getList();
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简单点
<?php
class email {
public static function sendemail(){
echo "发送邮件";
}
} class sms {
public static function sendsms(){
echo "发送短信";
}
} class example {
private $_send;
function setSend($send_function){
$this->_send = $send_function;
}
} $example = new example();
$example->setSend(sms::sendsms());
example好比注册的类，注册成功后想发送短信就
$example = new example();
$example->setSend(sms::sendsms());
想发送邮件就
$example = new example();
$example->setSend(email::sendemail())