关于PHP的拦截器使用
成考终于结束了,又可以安心下来看看代码的书
好吧,继续学习PHP
php提供了内置的拦截器,可以拦截发送到一些未定义的方法和属性消息
先看下__get($property),它主要访问未定义的属性时被调用
看下示例:
class Coder{
function __get($property){
$method = "get{$property}";
if(method_exists($this,$method)){
return $this->$method();
}
}
function getName(){
return "SUN";
}
}
$coder = new Coder();
print $coder->name;
程序执行后会输出SUN,如果程序里没有这个方法,就会什么也不做,会被解析成NULL
类似的方法还有__set(),__isset,__unset
下面主要来看下__call()这个方法,它是调用未定义的方法时被调用,有两个参数
1.$method, 这个是方法的名称;
2.$arg_array,是传递给要调用方法的所有参数(数组)
__call()方法对于实现委托的示例
class CoderWrite{
function printName(Coder $c){
print $c->getName();
}
}
class Coder{
private $write;
function __construct(CoderWrite $cw){
$this->write=$cw;
}
function __call($methodname,$args){
if(method_exists($this->write,$methodname)){
return $this->write->$methodname($this);
}
}
function getName(){
return "SUN";
}
}
调用:$coder = new Coder(new CoderWrite());
$coder->printName();
_call()方法会被调用,然后查找CoderWrite对象中有没有printName()方法,有的话就会调用。呵呵,是不是变相的给Coder对象增加了一个方法?

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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