Checks if the function has a specified return type

# ReflectionFunctionAbstract::hasReturnType

(PHP 7, PHP 8)

ReflectionFunctionAbstract::hasReturnType — Checks if the function has a specified return type

### 说明

public function ReflectionFunctionAbstract::hasReturnType(): bool

Checks whether the reflected function has a return type specified.

### 参数

此函数没有参数。

### 返回值

Returns `true` if the function is a specified return type, otherwise `false`.

### 示例

示例 #1 ReflectionFunctionAbstract::hasReturnType() example

    <?php

    function to_int($param): int
    {
        return (int) $param;
    }

    $reflection1 = new ReflectionFunction('to_int');
    var_dump($reflection1->hasReturnType());

以上示例会输出：

    bool(true)

示例 #2 Usage on built-in functions

    <?php

    $reflection2 = new ReflectionFunction('array_merge');

    var_dump($reflection2->hasReturnType());

以上示例会输出：

    bool(false)

### 参见

- ReflectionFunctionAbstract::getReturnType() - Gets the specified return type of a function

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