最常用的几个个php反射函数 get_class get_class_methods
1. get_class ? 返回对象的类名
string get_class ([ object $obj ] )
返回对象实例 obj 所属类的名字。如果 obj 不是一个对象则返回 FALSE。
Note: 在 PHP 扩展库中定义的类返回其原始定义的名字。在 PHP 4 中 get_class() 返回用户定义的类名的小写形式,但是在 PHP 5 中将返回类名定义时的名字,如同扩展库中的类名一样。
Note: 自 PHP 5 起,如果在对象的方法中调用则 obj 为可选项。
Example#1 使用 get_class()
class foo {
function foo()
{
// implements some logic
}
function name()
{
echo "My name is " , get_class($this) , "/n";
}
}
// create an object
$bar = new foo();
// external call
echo "Its name is " , get_class($bar) , "/n";
// internal call
$bar->name();
?>
上例将输出:
Its name is foo My name is foo
2.get_class_methods ? 返回由类的方法名组成的数组说明
array get_class_methods ( mixed $class_name )
返回由 class_name 指定的类中定义的方法名所组成的数组。如果出错,则返回 NULL。
Example#1 get_class_methods() 示例
class myclass {
// constructor
function myclass()
{
return(true);
}
// method 1
function myfunc1()
{
return(true);
}
// method 2
function myfunc2()
{
return(true);
}
}
$class_methods = get_class_methods('myclass');
// or
$class_methods = get_class_methods(new myclass());
foreach ($class_methods as $method_name) {
echo "$method_name/n";
}
?>
上例将输出:
myclass myfunc1 myfunc2
3.
get_class_vars ? 返回由类的默认属性组成的数组
说明array get_class_vars ( string $class_name )
返回由类的默认公有属性组成的关联数组,此数组的元素以 varname => value 的形式存在。
Note: 在 PHP 4.2.0 之前,get_class_vars() 不会包含未初始化的类变量。
Example#1 get_class_vars() 示例
class myclass {
var $var1; // 此变量没有默认值……
var $var2 = "xyz";
var $var3 = 100;
private $var4; // PHP 5
// constructor
function myclass() {
// change some properties
$this->var1 = "foo";
$this->var2 = "bar";
return true;
}
}
$my_class = new myclass();
$class_vars = get_class_vars(get_class($my_class));
foreach ($class_vars as $name => $value) {
echo "$name : $value/n";
}
?>
上例将输出:
// 在 PHP 4.2.0 之前 var2 : xyz var3 : 100 // 从 PHP 4.2.0 开始 var1 : var2 : xyz var3 : 100

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

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.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

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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