Table of Contents
How to determine the type of PHP function return value
1. Use typehint statement
Practical case
2. Inference based on function definition
3. Use gettype() function
4. Using third-party libraries
Practical case (Psalm)
Home Backend Development PHP Tutorial How can the type of return value of a PHP function be determined?

How can the type of return value of a PHP function be determined?

Apr 15, 2024 pm 10:51 PM
function return value type inference

Methods to determine the return value type of a PHP function include: 1. Using typehint declaration; 2. Inferring based on function definition; 3. Using gettype() function; 4. Using third-party libraries (such as Psalm and PHPStan).

PHP 函数返回值的类型可以是怎么确定的?

How to determine the type of PHP function return value

1. Use typehint statement

function greet(string $name): string {
    return "Hello, $name!";
}
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Practical case

$name = "John Doe";
$greeting = greet($name);
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2. Inference based on function definition

PHP can infer the type based on the return value of the function definition.

function calcSum(int ...$numbers): float {
    return array_sum($numbers);
}
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Practical case

$result = calcSum(1, 2, 3);
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3. Use gettype() function

This function returns an information string about the variable type.

function checkType($variable) {
    return gettype($variable);
}
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Practical case

$variable = 123;
$type = checkType($variable);
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4. Using third-party libraries

Some third-party libraries provide additional methods to determine the return value type of a function. For example, [Psalm](https://psalm.dev/) and [PHPStan](https://phpstan.org/) can perform type checking during code analysis.

Practical case (Psalm)

// psalm.xml 配置文件
<?xml version="1.0"?>
<psalm>
    <types>
        <method name="greet" class="App\Greetings">
            <return-type>string</return-type>
        </method>
    </types>
</psalm>
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