{"id":1533,"date":"2021-05-29T22:49:32","date_gmt":"2021-05-29T19:49:32","guid":{"rendered":"https:\/\/www.etemkeskin.com\/?p=1533"},"modified":"2021-05-30T01:16:48","modified_gmt":"2021-05-29T22:16:48","slug":"php-8-new-features","status":"publish","type":"post","link":"https:\/\/www.etemkeskin.com\/index.php\/2021\/05\/29\/php-8-new-features\/","title":{"rendered":"PHP 8 New Features"},"content":{"rendered":"\n

Many new features have come to PHP over the years. With these new features, PHP has become a more powerful, modern, stable and faster language. In this post, I will explain the new features that come with PHP 8. PHP 8 version was released on 26 November 2020<\/strong>.<\/p>\n\n\n\n

1- JIT Derleyici<\/h3>\n\n\n\n

The most notable innovation with PHP 8 is the JIT (just in time) <\/strong>compiler. PHP 8 offers two JIT compilation engines. Tracing JIT <\/strong>and Function JIT.<\/strong> Tracing JIT<\/em> <\/strong>has a superior feature.<\/p>\n\n\n\n

JIT<\/strong> was implemented as an almost independent part of OPcache<\/strong>. JIT working mechanism; the code is monitored and frequently used parts are compiled as bytcode and the compiled parts are executed at runtime.<\/p>\n\n\n\n

\"\"
PHP 8 performance metrics (kinsta.com)<\/figcaption><\/figure>\n\n\n\n

Since JIT is part of OPcache<\/strong>, OPcache must be enabled. For this, we need to set opcache.enable=1<\/code> in php.ini<\/code> file. Then we need to allocate memory like opcache.jit_buffer_size=1024M<\/code> to enable JIT. Its default value is 0, so the JIT compiler is disabled. If you’re not sure if it’s enabled, you can check using the opcache_get_status<\/code> function.<\/p>\n\n\n\n

2- Union Types<\/h3>\n\n\n\n

With PHP 8, it allows multiple type<\/strong> definitions in variables, parameter declarations in functions, and function return type declarations.<\/p>\n\n\n\n

class Product\n{\n    protected int|float $price; \n  \n    public function setPrice(int|float $price): void \n    {\n        $this->price = $price;\n    }\n    public function getPrice(): int|float \n    {\n        return $this->price;\n    }\n}<\/pre><\/div>\n\n\n\n
3- Nullsafe Operator<\/h3>\n\n\n\n
With the null safe operator, we can more easily check with the null check ?<\/strong> operator in chain methods. If a method returns null<\/strong>, the process is stopped.<\/p>\n\n\n\n
$country = $session?->user?->getAddress()?->country;<\/pre><\/div>\n\n\n\n
4- Match Expression<\/h3>\n\n\n\n
PHP 8 comes with a shorter and simpler structure of the switch case<\/strong> statement, the match<\/strong> statement. The result of the operation can be assigned to a variable or the returned value can be used.<\/p>\n\n\n\n
\/* PHP 8 *\/\nswitch (8.0) {\n  case '8.0':\n    $result = "Oh no!";\n    break;\n  case 8.0:\n    $result = "This is what I expected";\n    break;\n}\necho $result; \n\/\/OUTPUT: Oh no!\n\/* PHP 8 *\/\necho match (8.0) {\n  '8.0' => "Oh no!",\n  8.0 => "This is what I expected",\n};\n\/\/OUTPUT: This is what I expected<\/pre><\/div>\n\n\n\n
5- Saner string to number comparisons<\/strong><\/h3>\n\n\n\n
At PHP 8, if a numeric value is compared to string, the numeric value is converted to string and compared. PHP8 avoids inconsistencies such as PHP7 considering 0<\/strong> as an empty string or the comparison of 123 == “123abc”<\/strong> returning true<\/strong> instead of false<\/strong>.<\/p>\n\n\n\n
PHP7\n0 == 'foobar' \/\/ true\n\nPHP8\n0 == 'foobar' \/\/ false<\/pre><\/div>\n\n\n\n
6- Named Arguments<\/strong><\/h3>\n\n\n\n
We can specify mandatory parameters of a method or function and skip optional ones. For example, in a function that takes 9 parameters, the first 2 parameters are mandatory and the others are optional. If we want to send a value to only the 9th one of the optional parameters, we send the value to be sent to the function with its name.<\/p>\n\n\n\n
In addition, if we define the parameters to be sent with their names, we can send them in the order we want.<\/p>\n\n\n\n
function foo(string $a, string $b, ?string $c = null, ?string $d = null) \n{ \/* \u2026 *\/ }\n\nfoo(\n    b: 'value b', \n    a: 'value a', \n    d: 'value d',\n);<\/pre><\/div>\n\n\n\n
7- Constructor property promotion<\/strong><\/h3>\n\n\n\n
With PHP 8, it is easier to define and initialize properties inside the constructor method.<\/p>\n\n\n\n
\/*PHP 7*\/\nclass Point {\n  public float $x;\n  public float $y;\n\n  public function __construct(float $x = 0.0, float $y = 0.0) {\n    $this->x = $x;\n    $this->y = $y;\n  }\n}\n\/*PHP 8*\/\nclass Point {\n  public function __construct(\n    public float $x = 0.0,\n    public float $y = 0.0,\n  ) {}\n}<\/pre><\/div>\n\n\n\n
7- Attributes<\/strong> V2<\/h3>\n\n\n\n
A feature called annotation in Java, decorator in JavaScript and python<\/strong> and used to define metadata<\/strong> to classes, methods, functions, and variables is now available in PHP8.<\/p>\n\n\n\n
<<ExampleAttribute>>\nclass Foo\n{\n\t<<ExampleAttribute>>\n\tpublic const FOO = 'foo';\n\n\t<<ExampleAttribute>>\n\tpublic $x;\n\n\t<<ExampleAttribute>>\n\tpublic function foo(<<ExampleAttribute>> $bar) { }\n}\n\n$object = new <<ExampleAttribute>> class () { };\n\n<<ExampleAttribute>>\nfunction f1() { }\n\n$f2 = <<ExampleAttribute>> function () { };\n\n$f3 = <<ExampleAttribute>> fn () => 1;<\/pre><\/div>\n\n\n\n
8- Consistent type errors for internal functions<\/strong><\/h3>\n\n\n\n
PHP built-in functions now give more consistent error messages.<\/p>\n\n\n\n
\/**PHP 7*\/\nstrlen([]); \/\/ Warning: strlen() expects parameter 1 to be string, array given\n\/*PHP 8*\/\nstrlen([]); \/\/ TypeError: strlen(): Argument #1 ($str) must be of type string, array given<\/pre><\/div>\n\n\n\n
9- Other Features<\/h3>\n\n\n\n
str_contains()<\/strong> : Checks whether a string expression contains another string expression. Returns a boolean<\/code> value.<\/p>\n\n\n\n
str_contains ( string $haystack , string $needle ) :\nstr_contains("PHP is awesome", "PHP") \/\/ Output : true <\/pre><\/div>\n\n\n\n
\n\n\n\n
str_starts_with()<\/strong> :Checks whether a string expression starts with another string expression. Returns a boolean <\/code>value.<\/p>\n\n\n\n
\n\n\n\n
str_ends_with()<\/strong>: Checks if a string expression ends with another string expression. Returns a boolean<\/code> value.<\/p>\n\n\n\n
\n\n\n\n
get_debug_type()<\/strong>: get_debug_type ()<\/strong> does the same thing as gettype ()<\/strong> we used before and returns us the type of the variable.<\/p>\n\n\n\n
When the table below is examined, the differences between them will be understood more clearly.<\/p>\n\n\n\n
Type<\/th>Sample Value<\/th>gettype<\/code><\/th>get_debug_type<\/code><\/th><\/tr><\/thead>
Integer<\/td>123<\/code><\/td>integer<\/code><\/td>int<\/code><\/td><\/tr>
Float<\/td>3.14<\/code><\/td>double<\/code><\/td>float<\/code><\/td><\/tr>
Boolean<\/td>true<\/code><\/td>boolean<\/code><\/td>bool<\/code><\/td><\/tr>
Boolean<\/td>false<\/code><\/td>boolean<\/code><\/td>bool<\/code><\/td><\/tr>
String<\/td>'Foo'<\/code><\/td>string<\/code><\/td>string<\/code><\/td><\/tr>
Array<\/td>[1, 2, 3]<\/code><\/td>array<\/code><\/td>array<\/code><\/td><\/tr>
Null<\/td>null<\/code><\/td>NULL<\/code><\/td>null<\/code><\/td><\/tr>
Class<\/td>new Foo\\Bar()<\/code><\/td>object<\/code><\/td>Foo\\Bar<\/code><\/td><\/tr>
Class<\/td>new DateTime()<\/code><\/td>object<\/code><\/td>DateTime<\/code><\/td><\/tr>
Anonymous Class<\/td>new class {}<\/code><\/td>object<\/code><\/td>class@anonymous<\/code><\/td><\/tr>
Anonymous Class<\/td>new class extends Foo {}<\/code><\/td>object<\/code><\/td>Foo@anonymous<\/code><\/td><\/tr>
Closure<\/td>function() {}<\/code><\/td>object<\/code><\/td>Closure<\/code><\/td><\/tr>
Stream<\/td>tmpfile()<\/code><\/td>resource<\/code><\/td>resource (stream)<\/code><\/td><\/tr>
Curl<\/td>curl_init()<\/code><\/td>resource<\/code><\/td>resource (curl)<\/code><\/td><\/tr>
Xml<\/td>xml_parser_create()<\/code><\/td>resource<\/code><\/td>resource (xml)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
fdiv()<\/strong> : This function allows division by zero<\/strong><\/p>\n\n\n\n
fdiv(1, 0); \/\/ float(INF)\nfdiv(-1, 0); \/\/ float(-INF)<\/pre><\/div>\n\n\n\n
\n\n\n\n
mixed type :<\/strong>  In PHP8, type definition of mixed<\/strong> type can be made and it replaces the following types.<\/p>\n\n\n\n
array|bool|callable|int|float|null|object|resource|string\npublic function foo(mixed $value) {}<\/pre><\/div>\n\n\n\n
\n\n\n\n
trailing commas in parameter lists: <\/strong>We can put a comma in the last parameter when defining a function.<\/p>\n\n\n\n
public function foo(\n\t\tstring $x,\n\t\tfloat $z, \/\/ trailing comma\n\t) {\n\t\t\/\/ do something\n\t}<\/pre><\/div>\n\n\n\n
\n\n\n\n
using ::class on object :<\/strong> The use of get_class()<\/strong> before is now possible with $foo::class and gives the same result.<\/p>\n\n\n\n
$foo = new Foo();\n\nvar_dump($foo::class);<\/pre><\/div>\n\n\n\n
Good Luck …<\/p>\n","protected":false},"excerpt":{"rendered":"
Many new features have come to PHP over the years. With these new features, PHP has become a more powerful, modern, stable and faster language. In this post, I will explain the new features that come with PHP 8. PHP 8 version was released on 26 November 2020. 1- JIT Derleyici The most notable innovation […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"yoast_head":"\nPHP 8 New Features - blog website<\/title>\n<meta name=\"description\" content=\"Many new features have come to PHP over the years. With these new features, PHP has become a more powerful, modern, stable and faster language. In this post, I will explain the new features that come with PHP 8. PHP 8 version was released on 26 November 2020.1- JIT DerleyiciThe most notable innovation with PHP 8 is the JIT (just in time) compiler. PHP 8 offers two JIT compilation engines. Tracing JIT and Function JIT. Tracing JIT has a superior feature.JIT was implemented as an almost independent part of OPcache. JIT working mechanism; the code is monitored and frequently used parts are compiled as bytcode and the compiled parts are executed at runtime.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.etemkeskin.com\/index.php\/2021\/05\/29\/php-8-new-features\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP 8 New Features - blog website\" \/>\n<meta property=\"og:description\" content=\"Many new features have come to PHP over the years. With these new features, PHP has become a more powerful, modern, stable and faster language. In this post, I will explain the new features that come with PHP 8. 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