标签：des io ar os 使用 sp for 数据 on
get_object_vars函数，将对象中有访问权限的的字段转为数组
<?php
class foo {
private $a;
public $b = 1;
public $c;
private $d;
static $e;
public function test() {
var_dump(get_object_vars($this));
}
}
$test = new foo;
var_dump(get_object_vars($test));
$test->test();
?>
结果
array(2) {
["b"]=>
int(1)
["c"]=>
NULL
}
array(4) {
["a"]=>
NULL
["b"]=>
int(1)
["c"]=>
NULL
["d"]=>
NULL
}
2.array get_class_methods ( mixed $class_name )与array get_class_vars ( string $class_name )
得到类中的所有可访问的方法
<?php
class myclass {
// constructor
public function myclass()
{
return(true);
}
// method 1
protected function myfunc1()
{
return(true);
}
// method 2
private function myfunc2()
{
return(true);
}
public function description()
{
$class_methods = get_class_methods($this);
//or
$class_methods = get_class_methods(__CLASS__);
foreach ($class_methods as $method_name) {
echo "$method_name\n";
}
}
}
$class_methods = get_class_methods(‘myclass‘);
//得到所有公开的方法名称
foreach ($class_methods as $method_name) {
echo "$method_name\n";
}
//结果是==》myclass description
$class_methods = get_class_methods(new myclass());
//得到所有公开的方法名称，注意，构造方法为private或者protected时报错
foreach ($class_methods as $method_name) {
echo "$method_name\n";
}
//结果是==》myclass description
$t = new myclass();
$t->description();
//结果是==》myclass myfunc1 myfunc2 description
?>
2.__call魔术方法
在php官方描述中是调用不存在的方法时调用，这个定义不太完整，正确的定义是调用不存在或者非public的方法时触发
<?php
class User {
// method 1
protected function say()
{
return(true);
}
// method 2
private function sing()
{
return(true);
}
public function __call($name,$args)
{
$t = func_get_args(); //在默认函数中总用比较明显
print_r($t);
}
}
$m = new User();
$m->say(); //不触发
$m->sing();//触发
$m->talk();//触发
?>
2.__set,__get,__unset,__isset
有些时候对象为了适应变化，比如Model的字段经常改变，需要零时改变字段，这时需要动态的添加或者删除属性
<?php
class PropertyTest {
//动态数据存储容器
private $data = array();
/** 重载不能被用在已经定义的属性 */
public $declared = 1;
/** 只有从类外部访问这个属性时，重载才会发生 */
private $hidden = 2;
public function __set($name, $value)
{
// $this->$name = $value; //这种也是一种动态扩容的方式，但管理起来比较麻烦
$this->data[$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 ‘ . $trace[0][‘line‘],
E_USER_NOTICE);
return null;
}
/** PHP 5.1.0之后版本，调用，使用 isset判断时调用 */
public function __isset($name)
{
echo "Is ‘$name‘ set?\n";
return isset($this->data[$name]);
}
/** PHP 5.1.0之后版本，删除某个属性时 */
public function __unset($name)
{
echo "Unsetting ‘$name‘\n";
unset($this->data[$name]);
}
/** 非魔术方法 */
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 $obj->getHidden() . "\n";
echo $obj->hidden . "\n";
?>
代码中如下片段，类似于日志跟踪工具
$trace = debug_backtrace(); trigger_error( ‘Undefined property via __get(): ‘ . $name . ‘ in ‘ . $trace[0][‘file‘] . ‘ on line ‘ . $trace[0][‘line‘], E_USER_NOTICE);
4.get_class， get_parent_class，interface_exists，is_subclass_of，is_a，instanceOf
<?php
if(!interface_exists(‘man‘))
{
interface man
{
public function talk($msg);
}
}
class dad {
function dad()
{
// implements some logic
}
}
class child extends dad implements man
{
public function __toString()
{
return "I‘m ".get_parent_class($this)."‘s son\n";
}
public function talk($msg)
{
echo $msg;
}
}
class child2 extends dad {
public function __toString()
{
return "I‘m ".get_parent_class(‘child2‘)."‘s son too\n";
}
}
$foo = new child();
$bar = new child2();
$dad = new dad();
echo ‘<pre>‘;
var_dump(get_class($dad));
var_dump(get_class($foo));
var_dump(get_class($bar));
echo "<hr/>";
var_dump(get_parent_class($dad));
var_dump(get_parent_class($foo));
var_dump(get_parent_class($bar));
echo "<hr/>";
var_dump(is_subclass_of($foo,‘dad‘));
var_dump(is_subclass_of($foo,‘child‘)); //child类不是child类的子类,返回false
var_dump(is_subclass_of($foo,‘man‘));
echo "<hr/>";
var_dump(is_subclass_of(‘child‘,‘dad‘));
var_dump(is_subclass_of(‘child‘,‘child‘));//child类不是child类的子类.返回false
var_dump(is_subclass_of(‘child‘,‘man‘));
echo "<hr/>";
var_dump(is_a($foo,‘dad‘));//is_a等价于 instanceOf
var_dump(is_a($foo,‘man‘));
var_dump(is_a($foo,‘child‘));
echo "<hr/>";
var_dump(($foo instanceof dad));
var_dump(($foo instanceof child));
var_dump(($foo instanceof man));
?>
结果如下
string(3) "dad" string(5) "child" string(6) "child2" ------------------------------------------------------------------- bool(false) string(3) "dad" string(3) "dad" ------------------------------------------------------------------- bool(true) bool(false) bool(true) ------------------------------------------------------------------- bool(true) bool(false) bool(true) ------------------------------------------------------------------- bool(true) bool(true) bool(true) ------------------------------------------------------------------- bool(true) bool(true) bool(true)
好了，今天就到这里
标签：des io ar os 使用 sp for 数据 on
原文地址：http://my.oschina.net/ososchina/blog/345228
