Main new features of PHP7.0 I sorted out, new features of php7.0 _ PHP Tutorial

The main new features of PHP7.0 and php7.0. The main new features of PHP7.0 I have compiled. Up to now, PHP has released the RC5 version of php7. it is expected that the first official version will be released around May! Now I have sorted out the main new features of PHP 7.0 and new features of PHP.

So far, PHP has officially released the PHP 7 RC5 version. it is expected that the first official version will be released around May! Now, the major features of PHP 7 must have been finalized and won't be changed. Later versions of iterations mainly involve bug fixing and optimization. Let's talk about the new features of php7.0 that we have always been expecting.

1. scalar parameter type declaration

Currently, string, int, float, and Boolean parameters are supported. in the past, only class names, interfaces, arrays, and Callable parameters are supported.
Two styles: Forced conversion mode (default) and strict mode

<?php// Coercive modefunction sumOfInts(int ...$ints){return array_sum($ints);}var_dump(sumOfInts(2, '3', 4.1)); 

2. return type declaration

<?phpfunction arraysSum(array ...$arrays): array{return array_map(function(array $array): int {return array_sum($array);}, $arrays);}print_r(arraysSum([1,2,3], [4,5,6], [7,8,9])); 

3 .?? Operator

?? It is used to replace the scenario where isset is required. this is a syntactic sugar.

<?php// Fetches the value of $_GET['user'] and returns 'nobody'// if it does not exist.$username = $_GET['user'] ?? 'nobody';// This is equivalent to:$username = isset($_GET['user']) ? $_GET['user'] : 'nobody';// Coalescing can be chained: this will return the first// defined value out of $_GET['user'], $_POST['user'], and// 'nobody'.$username = $_GET['user'] ?? $_POST['user'] ?? 'nobody'; 

4. <=> comparison operators

Is to look at the size of the two expression values, three relationships: = return 0, <return-1,> return 1

<?php// Integersecho 1 <=> 1; // 0echo 1 <=> 2; // -1echo 2 <=> 1; // 1// Floatsecho 1.5 <=> 1.5; // 0echo 1.5 <=> 2.5; // -1echo 2.5 <=> 1.5; // 1// Stringsecho "a" <=> "a"; // 0echo "a" <=> "b"; // -1echo "b" <=> "a"; // 1 

5. define supports defining values of the array type

Php 5.6 already supports the CONST syntax to define constants of the array class, and PHP7 supports the define Syntax.

<?phpdefine('ANIMALS', ['dog','cat','bird']);echo ANIMALS[1]; // outputs "cat" 

6. anonymous class

<?phpinterface Logger {public function log(string $msg);}class Application {private $logger;public function getLogger(): Logger {return $this->logger;}public function setLogger(Logger $logger) {$this->logger = $logger;}}$app = new Application;$app->setLogger(new class implements Logger {public function log(string $msg) {echo $msg;}});var_dump($app->getLogger()); 

7. added the integer division function intp.

Summary:

PHP 7's performance breakthrough has become one of the hottest topics recently. the Official PHP 7.0.0 Beta 2 has been released.

New features

Performance improvement: PHP 7 is twice faster than PHP 5.6

Fully consistent 64-bit support

Removed some old unsupported SAPI (server-side application programming port) and extensions

Added the null join operator (??)

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Major new features of php7.0 and new features of php7.0 so far, PHP has officially released the RC5 version of php7. it is expected that the first official version will be released around May! Now...