PHP, JScript 和 VBScript 函数和类的语法_PHP
VBScript
1)函数的例子
php: function inc($val)
{ return $val + 1;}
过程也是个函数,只不过没有返回值。
jscript, javascript:
function inc(val)
{ return val + 1;}
过程的定义同上。
VBScript:
function inc(val)
inc = val + 1
end function
procedure
sub inc2(byref val)
val = val + 1
end sub
2)类的例子
php:
class parent {
var property;
function parent() { }
function method() { }
}
/* 继承 */
class child extends parent { var property= new value ;
}
jscript or javascript:
class parent {
property=value
function parent() function method() { } }
不支持继承(原文是这样,但好像现在也支持了)
vbscript:
不支持类((原文是这样,但现在也支持了)
3)变量的范围
php:变量在函数或类外定义是允许的是全局变量;也可以在函数和类中定义局部变量。
不像其它的语言,在使用变量时,你必须声名一个全局变量在函数和类中使用关键字global.
$globalvar = 1;
function show_global( ) {
global $globalvar;
print $globalvar;
}
jscript or javascript:
类似PHP, 在函数中不需声明全局变量.
vbscript:
类似PHP, 在函数和过程中不需声明全局变量.
4)访问引用
php:使用关键字,在函数的参数中
jscript or javascript
简单的通过变量访问,在函数里引用复杂的类型
vbscript:
使用ByRef 关键字在Sub 或函数的参数中.
5)默认参数
php:支持function A(param1="abc")
其它的不支持。
6)引用返回(不知如何翻)
php:function getarray123() {
$val = array(1,2,3);
return & $val;
}
然后在代码中使用
$val = &getarray123();
其它的不支持
7)类
php:支持的较好
其它的:一般
8)错误处理
php:使用@ 防止运行错误.
$val = @function_can_fail();
@范围是当前的声明,最后的错误能够在$php_errormsg检查出来,如果你设置了track_errors=On 在PHP.ini.
javascript or jscript:
使用try and catch.
try {
function_can_fail()
} catch(err) { Response.Write(err)
}
vbscript:
使用On Error Resume Next 忽略运行错误
新的版本也支持try 和 catch
另外,还有一篇关于语言的比较,有兴趣的也可以翻译一下。

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7


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