方法中的默认参数？

Question

有没有办法调用下面的方法，但只在末尾指定参数，并使用其他参数的默认值？

$published = true;
$this->display($published);


public function display($name = 'John', $date = 'December', $published = false){
    //$name = 'John'
    //$date = 'December'
    //$published = true
}

Answer 1

您可以使用反射，例如：

<?php

class A
{
    public function display($name = 'John', $date = 'December', $published = false)
    {
        var_dump($name, $date, $published);
    }

    public function test()
    {
        $args = [];
        $reflectionMethod = new ReflectionMethod($this, 'display');
        foreach($reflectionMethod->getParameters() as $parameter) {
            $args[$parameter->getName()] = $parameter->getDefaultValue();
        }
        $args['published'] = true;
        $reflectionMethod->invokeArgs($this, $args);
    }
}

(new A)->test();