<?php  
namespace Zend\Db\Table;  
class Select {}  

<?php  
//namespace Zend\Db;  
include('select.php');  
$s = new Zend\Db\Table\Select();  
$s->test();  

<?php  
class A {  
    public static function who() {  
        echo __CLASS__;  
    }  
    public static function test() {  
        self::who();  
    }  
}  
class B extends A {  
    public static function who() {  
         echo __CLASS__;  
    }  
}  
B::test();  

<?php  
class A {  
    public static function who() {  
        echo __CLASS__;  
    }  
    public static function test() {  
        static::who(); // 这里实现了延迟的静态绑定  
    }  
}  
class B extends A {  
    public static function who() {  
         echo __CLASS__;  
    }  
}  
  
B::test();  

<?php  
goto a;  
echo 'Foo';  
a:  
echo 'Bar';  
for($i=0,$j=50; $i<100; $i++) {  
  while($j--) {  
    if($j==17) goto end;  
  }   
}  
echo "i = $i";  
end:  
echo 'j hit 17';

<?php  
echo preg_replace_callback('~-([a-z])~', function ($match) {  
    return strtoupper($match[1]);  
}, 'hello-world');  
// 输出 helloWorld  
$greet = function($name)  
{  
    printf("Hello %s\r\n", $name);  
};  
$greet('World');  
$greet('PHP');  
//...在某个类中  
$callback =      function ($quantity, $product) use ($tax, &$total)         {  
   $pricePerItem = constant(__CLASS__ . "::PRICE_" .  strtoupper($product));  
   $total += ($pricePerItem * $quantity) * ($tax + 1.0);  
 };  
array_walk($products, $callback);

<?php  
class MethodTest {  
    public function __call($name, $arguments) {  
        // 参数 $name 大小写敏感  
        echo "调用对象方法 '$name' "  
             . implode(' -- ', $arguments). "\n";  
    }  
    /**  PHP 5.3.0 以上版本中本类方法有效  */  
    public static function __callStatic($name, $arguments) {  
        // 参数 $name 大小写敏感  
        echo "调用静态方法 '$name' "  
             . implode(' -- ', $arguments). "\n";  
    }  
}  

$obj = new MethodTest;  
$obj->runTest('通过对象调用');  
MethodTest::runTest('静态调用');  // As of PHP 5.3.0  

<?php  
class MethodTest {  
    public function __call($name, $arguments) {  
        // 参数 $name 大小写敏感  
        echo "Calling object method '$name' "  
             . implode(', ', $arguments). "\n";  
    }  
  
    /**  PHP 5.3.0 以上版本中本类方法有效  */  
    public static function __callStatic($name, $arguments) {  
        // 参数 $name 大小写敏感  
        echo "Calling static method '$name' "  
             . implode(', ', $arguments). "\n";  
    }  
}  
$obj = new MethodTest;  
$obj->runTest('in object context');  
MethodTest::runTest('in static context');  // As of PHP 5.3.0

<?php  
// Nowdoc 单引号 PHP 5.3之后支持  
$name = 'MyName';  
echo <<<'EOT'  
My name is "$name".  
EOT;  
//上面代码输出 My name is "$name". ((其中变量不被解析)  
// Heredoc不加引号  
echo <<<FOOBAR  
Hello World!  
FOOBAR;  
//或者 双引号 PHP 5.3之后支持  
echo <<<"FOOBAR"  
Hello World!  
FOOBAR;

<?php  
// 静态变量  
function foo()  
{  
    static $bar = <<<LABEL  
Nothing in here...  
LABEL;  
}  
// 类成员、常量  
class foo  
{  
    const BAR = <<<FOOBAR  
Constant example  
FOOBAR;  
  
    public $baz = <<<FOOBAR  
Property example  
FOOBAR;  
}

//PHP中定义常量通常是用这种方式
define("CONSTANT", "Hello world.");

//并且新增了一种常量定义方式
const CONSTANT = 'Hello World';

//原格式
$expr=$expr1?$expr1:$expr2
//新格式
$expr=$expr1?:$expr2

class Test{  
    public static function testgo()  
    {  
         echo "gogo!";  
    }  
}  
$class = 'Test';  
$action = 'testgo';  
$class::$action();  //输出 "gogo!" 

$ php -S localhost:3300

$ php -S localhost:3300 -t /path/to/root

$ php -S localhost:3300 router.php

官网的一个例子：
trait SayWorld {
        public function sayHello() {
                parent::sayHello();
                echo "World!\n";
                echo 'ID:' . $this->id . "\n";
        }
}

class Base {
        public function sayHello() {
                echo 'Hello ';
        }
}

class MyHelloWorld extends Base {
        private $id;

        public function __construct() {
                $this->id = 123456;
        }

        use SayWorld;
}

$o = new MyHelloWorld();
$o->sayHello();

/*will output:
Hello World!
ID:123456
 */

$arr = [1,'james', 'james@fwso.cn'];
$array = [
　　"foo" => "bar",
　　"bar" => "foo"
　　];

function myfunc() {
    return array(1,'james', 'james@fwso.cn');
}

$arr = myfunc();
echo $arr[1];

echo myfunc()[1];

$name = explode(",", "Laruence,male")[0];
explode(",", "Laruence,male")[3] = "phper";

$./configure --with-mysqli=mysqlnd

$./configure --with-mysqli

class test{
    function show(){
return 'test';
    }
}
echo (new test())->show();

foreach ([new Human("Gonzalo"), new Human("Peter")] as $human) {
    echo $human->{'hello'}();
}

function foo(callable $callback) {
}

　　foo("false"); //错误，因为false不是callable类型
　　foo("printf"); //正确
　　foo(function(){}); //正确
class A {
　　static function show() {
    }
}
　　foo(array("A", "show")); //正确

class bar {
function foo(bar $foo) {
}
//其中函数foo中的参数规定了传入的参数必须为bar类的实例，否则系统会判断出错。同样对于数组来说，也可以进行判断，比如：
function foo(array $foo) {
}
}
　　foo(array(1, 2, 3)); // 正确，因为传入的是数组
　　foo(123); // 不正确，传入的不是数组

echo "脚本执行时间 ", round(microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"], 2), "s";

echo json_encode("中文", JSON_UNESCAPED_UNICODE);
//"中文"

$bin  = 0b1101;
echo $bin;
//13

//从数据库获取一列，但返回是数组。
$userNames = [];
foreach ($users as $user) {
    $userNames[] = $user['name'];
}
//以前获取数组某列值，现在如下
$userNames = array_column($users, 'name');

$password = "foo";  
// creating the hash  
$hash = password_hash($password, PASSWORD_BCRYPT);  
// verifying a password  
if (password_verify($password, $hash)) {  
    // password correct!  
} else {  
    // password wrong!  
} 

function randomHexString($length) {  
    $str = '';  
    for ($i = 0; $i < $length; ++$i) {  
        $str .= "0123456789abcdef"[mt_rand(0, 15)]; // direct dereference of string  
    }  
}  
function randomBool() {  
    return [false, true][mt_rand(0, 1)]; // direct dereference of array  
} 

use Some\Deeply\Nested\Namespace\FooBar;  
// does not work, because this will try to use the global `FooBar` class  
$reflection = new ReflectionClass('FooBar'); 
echo FooBar::class;

function create_query($where, $order_by, $join_type='', $execute = false, $report_errors = true) { ... }

create_query("deleted=0", "name", default, default, false);

function foo(int $i) { ... }
foo(1);      // $i = 1
foo(1.0);    // $i = 1
foo("1");    // $i = 1
foo("1abc"); // not yet clear, maybe $i = 1 with notice
foo(1.5);    // not yet clear, maybe $i = 1 with notice
foo([]);     // error
foo("abc");  // error

<?php
class TimePeriod {
    public $seconds;
    public $hours {
        get { return $this->seconds / 3600; }
        set { $this->seconds = $value * 3600; }
    }
}
$timePeriod = new TimePeriod;
$timePeriod->hours = 10;
var_dump($timePeriod->seconds); // int(36000)
var_dump($timePeriod->hours);   // int(10)

<?php
function *xrange($start, $end, $step = 1) {
    for ($i = $start; $i < $end; $i += $step) {
        yield $i;
    }
}
foreach (xrange(10, 20) as $i) {
    // ...
}

$firstNames = [foreach ($users as $user) yield $user->firstName];

$firstNames = [];
foreach ($users as $user) {
    $firstNames[] = $user->firstName;
}

$underageUsers = [foreach ($users as $user) if ($user->age < 18) yield $user];

$array = [
    [1, 2],
    [3, 4],
];
foreach ($array as list($a, $b)) {
    echo "A: $a; B: $b\n";
}

echo array(1, 2, 3)[0];
echo [1, 2, 3][0];
echo "foobar"[2];

const A = 2;
const B = A + 1;
class C
{
    const STR = "hello";
    const STR2 = self::STR + ", world";
}

function test($arg = C::STR2)

function add(...$args)
{
    $result = 0;
    foreach($args as $arg)
        $result += $arg;
    return $result;
}

function add($a, $b, $c) {
    return $a + $b + $c;
}
$arr = [2, 3];
add(1, ...$arr);

namespace Name\Space {
    const FOO = 42;
    function f() { echo __FUNCTION__."\n"; }
}
namespace {
    use const Name\Space\FOO;
    use function Name\Space\f;

    echo FOO."\n";
    f();
}

42
Name\Space\f

<?php
$a = gmp_init(42);
$b = gmp_init(17);
 
// Pre-5.6 code:
var_dump(gmp_add($a, $b));
var_dump(gmp_add($a, 17));
var_dump(gmp_add(42, $b));


// New code:
var_dump($a + $b);
var_dump($a + 17);
var_dump(42 + $b);