Php 这个方法是getter/setter还是两者都不是
如果方法不带参数,从数据库中获取一些数据,然后将其设置为类中的属性Php 这个方法是getter/setter还是两者都不是,php,getter-setter,Php,Getter Setter,如果方法不带参数,从数据库中获取一些数据,然后将其设置为类中的属性 该方法被认为是getter、setter,两者都不是,还是做得太多?这不是getter。或二传手。getter或setter是在类内获取或设置属性的东西 <?php class Person { protected $name; // Setter public function setName($name) { $this->name = $name; }
该方法被认为是getter、setter,两者都不是,还是做得太多?这不是getter。或二传手。getter或setter是在类内获取或设置属性的东西
<?php
class Person {
protected $name;
// Setter
public function setName($name) {
$this->name = $name;
}
// Getter
public function getName() {
return $this->name;
}
}
从技术上讲,getter和setter是类内部的东西,当您在类内部获取或设置属性(errrr变量)时—从类外部的代码调用时。这些getter和setter函数(在很大程度上)用于修改类的私有属性
您所描述的只是一个设置属性的函数,它既不是setter,也不是getter,它只是
getter的一个例子是一个函数,它每次从中获取属性值时都会执行某些操作(比如说,将计数器的值递增多少次)。setter则正好相反——在本例中,计算为属性赋值的次数
实际上,您应该阅读set和get魔术方法的。下面是从PHP站点上截取的getter和setter类的快速示例:
<?php
class PropertyTest
{
/** Location for overloaded data. */
private $data = array();
/** Overloading not used on declared properties. */
public $declared = 1;
/** Overloading only used on this when accessed outside the class. */
private $hidden = 2;
public function __set($name, $value)
{
echo "Setting '$name' to '$value'\n";
$this->data[$name] = $value;
}
public function __get($name)
{
echo "Getting '$name'\n";
if (array_key_exists($name, $this->data)) {
return $this->data[$name];
}
$trace = debug_backtrace();
trigger_error(
'Undefined property via __get(): ' . $name .
' in ' . $trace[0]['file'] .
' on line ' . $trace[0]['line'],
E_USER_NOTICE);
return null;
}
/** As of PHP 5.1.0 */
public function __isset($name)
{
echo "Is '$name' set?\n";
return isset($this->data[$name]);
}
/** As of PHP 5.1.0 */
public function __unset($name)
{
echo "Unsetting '$name'\n";
unset($this->data[$name]);
}
/** Not a magic method, just here for example. */
public function getHidden()
{
return $this->hidden;
}
}
echo "<pre>\n";
$obj = new PropertyTest;
$obj->a = 1;
echo $obj->a . "\n\n";
var_dump(isset($obj->a));
unset($obj->a);
var_dump(isset($obj->a));
echo "\n";
echo $obj->declared . "\n\n";
echo "Let's experiment with the private property named 'hidden':\n";
echo "Privates are visible inside the class, so __get() not used...\n";
echo $obj->getHidden() . "\n";
echo "Privates not visible outside of class, so __get() is used...\n";
echo $obj->hidden . "\n";
?>
您当前的方法不是getter
。因为它不会从对象返回数据
它包含一个setter
,您应该将其提取为一个真正的setData()
方法
您确实应该将其分为两种方法:
这种方法是违法的。
function retrieveData() {
// get data from the database
return $data;
}
function setData($data);
$this->data = $data;
}
function yourCurrentMethod() {
$data = $this->retrieveData();
$this->setData($data);
}