


How can the type of return value of a PHP function be determined?
Apr 15, 2024 pm 10:51 PMMethods 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).
How to determine the type of PHP function return value
1. Use typehint statement
function greet(string $name): string { return "Hello, $name!"; }
Practical case
$name = "John Doe"; $greeting = greet($name);
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); }
Practical case
$result = calcSum(1, 2, 3);
3. Use gettype()
function
This function returns an information string about the variable type.
function checkType($variable) { return gettype($variable); }
Practical case
$variable = 123; $type = checkType($variable);
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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