PHP 匿名函數

回調函數(callback)

PHP是將函數以string形式傳遞的.

function testCallBack()
{
    echo "test function.\n";
}

class Test
{
    public function testCallBack()
    {
        echo "test class \n";
    }
}

call_user_func("testCallBack");//調用一個函數

$test = new \Test();
call_user_func(array($test,"testCallBack"));//調用一個對象的方法

匿名函數(Closure[閉包函數])

1. 匿名函數示例

call_user_func(function(...$t){
    var_dump($t);
},"ccc","sss");

2. 匿名函數變量賦值示例

$name = 'ccc';
$test = function(...$t) use($name){
    var_dump($t);
    var_dump($name);
};
$test(1,2,3);

3. Closure bind

// Test.php
<?php

namespace app;

class Test
{
    public function test()
    {
        echo "test\n";
    }


    private function test1()
    {
        echo "test1\n";
    }

    protected function test2()
    {
        echo "test2\n";
    }
}

$test = new \app\Test();
$cl = \Closure::bind(function(){
    $this->test();
    $this->test1();
    $this->test2();
},$test,\app\Test::class);
$cl();

4. Closure bindTo

$test = new \app\Test();
$cl2 = function (){
  $this->test1();
};
$cl3 = $cl2->bindTo($test,\app\Test::class);
$cl3();

5. Closure call

$test = new \app\Test();
$cl2 = function (){
  $this->test1();
};
$cl2->call($test); // 注意此方法與bindTo的不一樣