Use case analysis of multiple constructors in PHP advanced object construction

Building objects is an important theme in PHP object-oriented programming design. In the simplest case, the ordinary constructor is enough, but if you want to carry out a more complex design, the constructor may become difficult to manage.

Here is a paragraph The code example demonstrates the principle of using multiple constructors for object construction in PHP advanced object construction.

<?php 
class classUtil {//这是一个参数处理的类 
public static function typeof($var){ 
if (is_object($var)) return get_class($var);//如果是对象，获取类名 
if (is_array($var)) return "array";//如果是数组，返回"array" 
if (is_numeric($var)) return "numeric";//如果是数字，返回"numeric" 
return "string";//
字符串
返回 "string" 
} 
public static function typelist($args){ 
return 
array_map
(array("self","typeof"),$args);//数组循环通过调用self::typeof处理$args中的每个元素 
} 
public static function callMethodForArgs($object,$args,$name="construct"){ 
$method=$name."_".implode("_",self::typelist($args));//implode 是把数组元素用"_"连接成一个字符串 
if (!is_callable(array($object,$method))){//is_callable()函数测试$object::$method是不是可调用的结构 
echo sprintf("Class %s has no methd &#39;$name&#39; that takes". 
"arguments (%s)",get_class($object),implode(",",self::typelist($args))); 
call_user_func_array(array($object,$method),$args);//call_user_func_array函数调用$object::$method（$args） 
} 
} 
} 
class dateAndTime { 
private $timetamp; 
public function construct(){//自身的构造函数 
$args=func_get_args();//获取参数 
classUtil::callMethodForArgs($this,$args);//调用参数处理类的方法 
} 
public function construct_(){//参数为空的时候 
$this->timetamp=time(); 
} 
public function construct_dateAndTime($datetime){//为类自身的时候 
$this->timetamp=$datetime->getTimetamp(); 
} 
public function construct_number($timestamp){//为数字的时候 
$this->timetamp=$timestamp; 
} 
public function construct_string($string){//为时间型字符串时候 
$this->timetamp=strtotime($string); 
} 
public function getTimetamp(){//获取
时间戳
的方法 
return $this->timetamp; 
} 
} 
?>

In fact, it is very simple. The main thing is to process the parameters. Whether the parameters are characters, numbers, or classes, different processing is advanced, which increases the flexibility of the code. sex.

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