[PHP7.0-PHP7.2]的新特性和新变更

var_dump(‘PHP‘ <=> ‘Node‘); // int(1)var_dump(123 <=> 456); // int(-1)var_dump([‘a‘, ‘b‘] <=> [‘a‘, ‘b‘]); // int(0)

# php7以前if(isset($_GET[‘a‘])) { ?$a = $_GET[‘a‘];}# php7以前$a = isset($_GET[‘a‘]) ? $_GET[‘a‘] : ‘none‘;#PHP 7$a = isset($_GET[‘a‘]) ?? ‘none‘;

function sumOfInts(int ...$ints){ ???return array_sum($ints);}ar_dump(sumOfInts(2, ‘3‘, 4.1)); // int(9)# 严格模式declare(strict_types=1);function add(int $x, int $y){ ???return $x + $y;}var_dump(add(‘2‘, 3)); // Fatal error: Argument 1 passed to add() must be of the type integer

function fun(int $a): array{ ?return $a;}fun(3);//Fatal error

//php7以前class Logger{ ???public function log($msg) ???{ ???????echo $msg; ???}}$util->setLogger(new Logger());// php7+$util->setLogger(new class { ???public function log($msg) ???{ ???????echo $msg; ???}});

echo "\u{aa}";// aecho "\u{0000aa}";// aecho "\u{9999}";// 香

class A {private $x = 1;}// PHP 7 之前版本的代码$getXCB = function() {return $this->x;};$getX = $getXCB->bindTo(new A, ‘A‘); // 中间层闭包echo $getX();// PHP 7+ 及更高版本的代码$getX = function() {return $this->x;};echo $getX->call(new A);

// 将所有的对象都转换为 __PHP_Incomplete_Class 对象$data = unserialize($foo, ["allowed_classes" => false]);// 将除 MyClass 和 MyClass2 之外的所有对象都转换为 __PHP_Incomplete_Class 对象$data = unserialize($foo, ["allowed_classes" => ["MyClass", "MyClass2"]);// 默认情况下所有的类都是可接受的，等同于省略第二个参数$data = unserialize($foo, ["allowed_classes" => true]);

printf(‘%x‘, IntlChar::CODEPOINT_MAX);echo IntlChar::charName(‘@‘);var_dump(IntlChar::ispunct(‘!‘));

ini_set(‘assert.exception‘, 1);class CustomError extends AssertionError {}assert(false, new CustomError(‘Some error message‘));

#php7以前use app\model\A;use app\model\B;#php7+use app\model{A,B}

$gen = (function() { ???yield 1; ???yield 2; ???return 3;})();foreach ($gen as $val) { ???echo $val, PHP_EOL;}echo $gen->getReturn(), PHP_EOL;# output//1//2//3

function gen(){ ???yield 1; ???yield 2; ???yield from gen2();}function gen2(){ ???yield 3; ???yield 4;}foreach (gen() as $val){ ???echo $val, PHP_EOL;}

var_dump(intdiv(10,3)) //3

session_start([ ???‘cache_limiter‘ => ‘private‘, ???‘read_and_close‘ => true,]);

string preg_replace_callback_array(array $regexesAndCallbacks, string $input);$tokenStream = []; // [tokenName, lexeme] pairs$input = <<<‘end‘$a = 3; // variable initialisationend;// Pre PHP 7 codepreg_replace_callback( ???[ ???????‘~\$[a-z_][a-z\d_]*~i‘, ???????‘~=~‘, ???????‘~[\d]+~‘, ???????‘~;~‘, ???????‘~//.*~‘ ???], ???function ($match) use (&$tokenStream) { ???????if (strpos($match[0], ‘$‘) === 0) { ???????????$tokenStream[] = [‘T_VARIABLE‘, $match[0]]; ???????} elseif (strpos($match[0], ‘=‘) === 0) { ???????????$tokenStream[] = [‘T_ASSIGN‘, $match[0]]; ???????} elseif (ctype_digit($match[0])) { ???????????$tokenStream[] = [‘T_NUM‘, $match[0]]; ???????} elseif (strpos($match[0], ‘;‘) === 0) { ???????????$tokenStream[] = [‘T_TERMINATE_STMT‘, $match[0]]; ???????} elseif (strpos($match[0], ‘//‘) === 0) { ???????????$tokenStream[] = [‘T_COMMENT‘, $match[0]]; ???????} ???}, ???$input);// PHP 7+ codepreg_replace_callback_array( ???[ ???????‘~\$[a-z_][a-z\d_]*~i‘ => function ($match) use (&$tokenStream) { ???????????$tokenStream[] = [‘T_VARIABLE‘, $match[0]]; ???????}, ???????‘~=~‘ => function ($match) use (&$tokenStream) { ???????????$tokenStream[] = [‘T_ASSIGN‘, $match[0]]; ???????}, ???????‘~[\d]+~‘ => function ($match) use (&$tokenStream) { ???????????$tokenStream[] = [‘T_NUM‘, $match[0]]; ???????}, ???????‘~;~‘ => function ($match) use (&$tokenStream) { ???????????$tokenStream[] = [‘T_TERMINATE_STMT‘, $match[0]]; ???????}, ???????‘~//.*~‘ => function ($match) use (&$tokenStream) { ???????????$tokenStream[] = [‘T_COMMENT‘, $match[0]]; ???????} ???], ???$input);

string random_bytes(int length);int random_int(int min, int max);

#php7+define(‘ALLOWED_IMAGE_EXTENSIONS‘, [‘jpg‘, ‘jpeg‘, ‘gif‘, ‘png‘]);

function handler(Exception $e) { ... }set_exception_handler(‘handler‘);// 兼容 PHP 5 和 7function handler($e) { ... }// 仅支持 PHP 7function handler(Throwable $e) { ... }

list($a,$b,$c) = [1,2,3];var_dump($a);//1var_dump($b);//2var_dump($c);//3

<?php$array = [0, 1, 2];foreach ($array as &$val) { ???var_dump(current($array));}?>#php 5int(1)int(2)bool(false)#php7int(0)int(0)int(0)

var_dump("0x123" == "291");#php5true#php7false ?

#php5function($a = null){ ?if($a===null) { ???return null; ?} ?return $a;}#php7+function fun() :?string{ ?return null;}function fun1(?$a){ ?var_dump($a);}fun1(null);//nullfun1(‘1‘);//1

function fun() :void{ ?echo "hello world";}

class Something{ ???const PUBLIC_CONST_A = 1; ???public const PUBLIC_CONST_B = 2; ???protected const PROTECTED_CONST = 3; ???private const PRIVATE_CONST = 4;}

function iterator(iterable $iter){ ???foreach ($iter as $val) { ???????// ???}}

try { ???// some code} catch (FirstException | SecondException $e) { ???// handle first and second exceptions}

$data = [ ???["id" => 1, "name" => ‘Tom‘], ???["id" => 2, "name" => ‘Fred‘],];// list() stylelist("id" => $id1, "name" => $name1) = $data[0];var_dump($id1);//1

$a= "hello";$a[-2];//l

<?phpclass Test{ ???public function exposeFunction() ???{ ???????return Closure::fromCallable([$this, ‘privateFunction‘]); ???} ???private function privateFunction($param) ???{ ???????var_dump($param); ???}}$privFunc = (new Test)->exposeFunction();$privFunc(‘some value‘);

function test(object $obj) : object{ ???return new SplQueue();}test(new StdClass());

; ini fileextension=php-astzend_extension=opcache

<?phpabstract class A{ ???abstract function test(string $s);}abstract class B extends A{ ???// overridden - still maintaining contravariance for parameters and covariance for return ???abstract function test($s) : int;}

$db->quote(‘über‘, PDO::PARAM_STR | PDO::PARAM_STR_NATL);

use Foo\Bar\{ ???Foo, ???Bar, ???Baz,};

var_dump(number_format(-0.01)); // now outputs string(1) "0" instead of string(2) "-0"

var_dump(get_class(null))// warning

count(1), // integers are not countable

var_dump(HEELLO);

// array to object$arr = [0 => 1];$obj = (object)$arr;var_dump( ???$obj, ???$obj->{‘0‘}, // now accessible ???$obj->{0} // now accessible);