How to write two suffix parameters in php

The writing method of the two suffixed parameters in PHP is: function functionName(arg1, arg2...) ?: returnType. It includes the function name, the parameter list (separated by commas), optional parameter type hints, and optional return value type hints. Parameter type hints and return value type hints help improve code readability, reduce errors, and improve maintainability.

The way to write the two suffix parameters in PHP

In PHP, the way to write the two suffix parameters is:

<code class="php">function functionName(arg1, arg2...) ?: returnType</code>

Among them:

• functionName: function name
• arg1, arg2...: function parameter list , separated by commas
• ?: parameter type hint, optional
• returnType: function return type, optional

Example:

<code class="php">// 定义一个计算两个数字之和的函数
function sum(int $num1, int $num2): int {
  return $num1 + $num2;
}

// 调用 sum 函数
$result = sum(10, 20); // $result = 30</code>

Parameter type hints

PHP version 7.0 introduces parameter type hints to specify the expected types of function parameters. This helps improve code readability and reduces potential errors.

Return value type hints

PHP 7.0 version also introduces return value type hints, which can specify the expected return value type of a function. This helps catch return type errors and improves code maintainability.

Note:

• Both parameter type hints and return value type hints are optional.
• If the parameter type hint or return value type hint does not match the actual value type, a TypeError exception will be raised.

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