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    ReflectionType::allowsNull

    (PHP 7, PHP 8)

    ReflectionType::allowsNull — Checks if null is allowed

    说明

    public ReflectionType::allowsNull(): bool

    Checks whether the parameter allows null.

    参数

    此函数没有参数。

    返回值

    true if null is allowed, otherwise false

    示例

    示例 #1 ReflectionType::allowsNull() example

    <?php
    function someFunction(string $param, stdClass $param2 = null) {}

    $reflectionFunc = new ReflectionFunction('someFunction');
    $reflectionParams = $reflectionFunc->getParameters();

    var_dump($reflectionParams[0]->getType()->allowsNull());
    var_dump($reflectionParams[1]->getType()->allowsNull());

    以上示例会输出：

    bool(false)
bool(true)

    参见

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