What is the syntactic structure of PHP functions?

PHP function syntax structure: function function_name(parameter1, parameter2, ...) { // Function body // Return value (optional)}, parameter list: The function accepts one or more parameters, separated by commas and used as Data input; function body: contains the code to be executed; return value: uses the return statement to return a value, otherwise null is returned.

Syntax structure of PHP function

A PHP function is a reusable block of code that performs a specific task. A function definition consists of a function name, a parameter list, and a function body, which contains the code to be executed.

Syntax structure:

function function_name(parameter1, parameter2, ...) {
  // 函数体
  // 返回值（可选）
}

Parameter list:

• The function can accept one or more parameters, use Comma separated.
• Parameters are variables used to pass data to the function.

Function body:

• The function body contains the code to be executed.
• The code can use any PHP syntax, including control flow statements, variables, and operators.

Return value:

• The function can return a value using the return statement.
• If the return statement is omitted, the function will return null.

Practical case:

Consider a function that calculates the sum of two numbers:

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

In this function:

• function sum is the function name.
• ($num1, $num2) is the parameter list of the function.
• The function body calculates the sum of $num1 and $num2 and returns it.

Usage:

To use a function, just call the function name and pass the appropriate parameters, like this:

$result = sum(5, 10); // 结果将为 15

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