<?php

class Outer

{

    private $prop = 1;

    protected $prop2 = 2;

    protected function func1()

    {

        return 3;

    }

    public function func4()

    {

        return $this->prop;

    }

    public function func2()

    {

        return new class() extends Outer {

            public function func3()

            {

            return $this->prop2 + $this->func4() + $this->func1();

            }

        };

    }

}

echo (new class() extends Outer{})->func4();

echo (new Outer)->func2()->func3();

<?php

$arr = array();

for ($i=0; $i<3; $i++){

  $arr[] = new class($i){

    public $index=0;

    function __construct($i)

    {

      $this->index = $i;

      echo 'create</br>';

    }

    public function getVal(){

      echo $this->index;

    }

  };

}

$arr[1]->getVal();

echo '<br>';

var_dump($arr[1]);

<?php

$input = <<<'EOF'

1;PHP;Likes dollar signs

2;Python;Likes whitespace

3;Ruby;Likes blocks

EOF;

function input_parser($input) {

    foreach (explode("\n", $input) as $line) {

        $fields = explode(';', $line);

        $id = array_shift($fields);

        yield $id => $fields;

    }

}

foreach (input_parser($input) as $id => $fields) {

    echo "$id:<br>";

    echo "    $fields[0]<br>";

    echo "    $fields[1]<br>";

}

<?php

function gen_three_nulls() {

    foreach (range(1, 3) as $i) {

        yield;

    }

}

var_dump(iterator_to_array(gen_three_nulls()));

<?php

function gen()

{

    yield 1;

    yield 2;

    yield from gen2();

}

function gen2()

{

    yield 3;

    yield 4;

}

print_r(iterator_to_array(gen(),false));

// foreach (gen() as $val)

// {

//     echo $val, PHP_EOL;

// }

<?php

class A {private $x = 1;}

// Pre PHP 7 代码

$getXCB = function() {return $this->x;};

$getX = $getXCB->bindTo(new A, 'A'); // intermediate closure

echo $getX();

// PHP 7+ 代码

$getX = function() {return $this->x;};

echo $getX->call(new A);

<?php

define('ANIMALS', [

    'dog',

    'cat',

    'bird'

]);

echo ANIMALS[1]; // 输出 "cat"

?>