Syntax for creating PHP functions?

PHP function creation syntax: function function name (parameter) { // function body }. Steps: Choose a function name. Specify parameters (optional). Create a function body containing the code to be executed.

Syntax for creating PHP functions

In PHP, a function is a block of code that can be used over and over again and passed Name call. The syntax for creating a function is as follows:

function function_name(parameters) {
  // 函数体
}

Here are the steps to create a PHP function:

1. Choose a function name:The function name must start with a letter or an underscore, Subsequent letters, underscores, or numbers can be used.
2. Specify parameters (optional): Parameters are the values ​​received by the function, they can be any PHP data type. In the above syntax, the parameters part is a comma-separated list that can accept zero or more parameters.
3. Create function body: The function body contains the code to be executed.

Practical case:

Let’s create a simple PHP function to calculate the sum of two numbers:

function addNumbers($num1, $num2) {
  // 计算 $num1 和 $num2 的和
  $sum = $num1 + $num2;

  // 返回和
  return $sum;
}

To use this function, we can call it and pass parameters:

$result = addNumbers(5, 10); // 结果为 15

This way, we can reuse the addNumbers function in different contexts without writing the same code every time.

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