Laravel 5.1
的 Facade
类 的 __callStatic
方法代码如下:
public static function __callStatic($method, $args)
{
$instance = static::getFacadeRoot();
if (! $instance) {
throw new RuntimeException('A facade root has not been set.');
}
switch (count($args)) {
case 0:
return $instance->$method();
case 1:
return $instance->$method($args[0]);
case 2:
return $instance->$method($args[0], $args[1]);
case 3:
return $instance->$method($args[0], $args[1], $args[2]);
case 4:
return $instance->$method($args[0], $args[1], $args[2], $args[3]);
default:
return call_user_func_array([$instance, $method], $args);
}
}
为什么不直接写成:
public static function __callStatic($method, $args)
{
$instance = static::getFacadeRoot();
if (! $instance) {
throw new RuntimeException('A facade root has not been set.');
}
return call_user_func_array([$instance, $method], $args);
}
答:call_user_func_array
效率偏低。
直接调用
变量函数调用
call_user_func
调用
call_user_func_array
调用
我们可以看到,call_user_func_array
所用时间为:1.1608240604401s
测试代码如下:
<?php
error_reporting(E_ALL | E_STRICT);
define('ITERATIONS', 2000000);
class Bench
{
private $bench_name;
private $start_time;
private $end_time;
public function start($name)
{
$this->bench_name = $name;
$this->start_time = microtime(true);
}
public function end()
{
$this->end_time = microtime(true);
echo "Call style: " . $this->bench_name . '; ' . ($this->end_time - $this->start_time) . " seconds". PHP_EOL;
}
}
class Test
{
public function test($a, $b, $c)
{
return;
}
}
$bench = new Bench();
$test = new Test();
$arg = [1, 2, 3];
$func_name = 'test';
$bench->start('normal');
for ($i=0; $i < ITERATIONS; ++$i) {
$test->test($arg[0], $arg[1], $arg[2]);
}
$bench->end();
$bench->start('var_function');
for ($i=0; $i < ITERATIONS; ++$i) {
$test->$func_name($arg[0], $arg[1], $arg[2]);
}
$bench->end();
$bench->start('call_user_func');
for ($i=0; $i < ITERATIONS; ++$i) {
call_user_func([$test, $func_name], $arg[0], $arg[1], $arg[2]);
}
$bench->end();
$bench->start('call_user_func_array');
for ($i=0; $i < ITERATIONS; ++$i) {
call_user_func_array([$test, $func_name], $arg);
}
$bench->end();
我刚刚创建了一个laravel的项目
"laravel/framework": "5.5.*"
然后看了源码:
/**
* Handle dynamic, static calls to the object.
*
* @param string $method
* @param array $args
* @return mixed
*
* @throws \RuntimeException
*/
public static function __callStatic($method, $args)
{
$instance = static::getFacadeRoot();
if (! $instance) {
throw new RuntimeException('A facade root has not been set.');
}
return $instance->$method(...$args);
}
题主是不是看错了或者看的是修改过的源码,原始laravel中并没有发现存在这些代码,能否标出具体的laravel版本和文件路径
我看到的laravel的 Facade 类中代码是这样的
/**
* Handle dynamic, static calls to the object.
*
* @param string $method
* @param array $args
* @return mixed
*
* @throws \RuntimeException
*/
public static function __callStatic($method, $args)
{
$instance = static::getFacadeRoot();
if (! $instance) {
throw new RuntimeException('A facade root has not been set.');
}
return $instance->$method(...$args);
}