What is the difference between PHP functions and C# functions?

The difference between PHP and C# functions: Concept: PHP functions are used for specific tasks, and C# functions are used to encapsulate code. Syntax: PHP functions use the function keyword, and C# functions use the public static void keyword. Return type: PHP functions can return any type, and C# functions must specify the return type. Namespace: PHP functions can be defined in the global namespace or a specific namespace, while C# functions must be defined in a class or namespace. Scope: PHP functions are visible in the definition scope, and C# functions are visible in the declared namespace or class. Parameters: PHP function parameters are passed by value and can have default values; C# function parameters are passed by value or reference and have no default value.

The difference between PHP functions and C# functions

Concept

• PHP Functions: are blocks of code that can be created and used in PHP scripts to perform specific tasks.
• C# Functions: are code blocks that can be created and used in C# code to encapsulate reused code blocks.

Syntax

PHP

function functionName(argument1, argument2, ...) {
    // Function body
}

C

#

public static void FunctionName(argument1, argument2, ...) {
    // Function body
}

Return type

PHP

• PHP functions can return any type of value, including void.
• If the PHP function does not specify a return type, it returns void by default.

C

• #C# Functions must specify a return type.
• If a C# function does not return any value, it should be declared void.

Namespace

PHP

##PHP functions can be defined in the global namespace, also Can be defined in a specific namespace.

C

#C# Functions must be defined in a class or namespace.

Scope

PHP

PHP functions are defined within the scope or nesting of Visible in scope.

C

#C# Functions are visible within the namespace or class in which they are declared.

Parameters

PHP

##PHP functions can receive parameters passed by value.

• Parameters can have default values ​​if not provided when calling the function.

C

#C# Functions can receive arguments passed by value or by reference.

• Parameters cannot have default values.

Practical case

PHP

function addNumbers(int $num1, int $num2): int {
    return $num1 + $num2;
}

echo addNumbers(5, 10); // 输出：15

C

#

public static int AddNumbers(int num1, int num2) {
    return num1 + num2;
}

Console.WriteLine(AddNumbers(5, 10)); // 输出：15

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