What is the syntax of PHP functions?

The syntax of PHP function is: function function_name(parameter1, parameter2, ...) { // Function body }. The function body contains the code, the parameters pass data, and the return type specifies the data type returned.

Syntax of PHP functions

Functions are reusable modules in your code that allow blocks of code to be grouped and used as many times as needed calls. The syntax of a function in PHP is as follows:

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

Function body
The function body contains the function code that will be executed when the function is called.

Parameters
The parameters are the data passed to the function. They are declared within function brackets, with each parameter separated by commas.

Return type
The function can specify a return type, indicating the data type that will be returned after the function is executed. The return type is specified before the function name, for example:

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

Practical case: Calculate string length

function get_string_length(string $string): int {
    return strlen($string);
}

// 调用函数并输出结果
$string = "Hello World";
echo get_string_length($string); // 输出 11

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