What are the naming rules for PHP function names? How many times will it be called?

PHP function naming rules: start with a letter or underscore, contain only letters, numbers or underscores, and are case-sensitive. The number of times a function is called depends on the program execution flow and function usage.

Naming rules for PHP function names

The naming rules for PHP function names are as follows:

• Begins with a letter or underscore
• Contains only letters, numbers or underscores
• Case sensitive

The number of times the function was called

It is impossible to determine the number of times a function is called in the program. This depends on the execution flow of the program and the usage of the function.

Practical case

The following is an example of a simple PHP function:

<?php
// 定义函数
function add_numbers($num1, $num2) {
  return $num1 + $num2;
}

// 调用函数
$sum = add_numbers(10, 20);

// 输出结果
echo $sum; // 输出: 30

In this example, the add_numbers function was called once.

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