Let's talk about some new grammatical features of PHP8-PHP8-php.cn

Let's talk about some new grammatical features of PHP8

藏色散人

Release： 2023-02-17 11:54:01

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This article introduces some new grammatical features of PHP8 to you. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Some new syntax features of PHP8

Named parameters

function test($name, $age=&#39;18&#39;, $sex=&#39;男&#39;) {
    echo $name . &#39;-------&#39; . $age . &#39;--------&#39;. $sex;
}
test(&#39;Landy&#39;, age: 20, sex: &#39;女&#39;); //Landy-------20--------女

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You can alsoSkip parameters

test(&#39;Landy&#39;, sex: &#39;女&#39;); //Landy-------18--------女

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The order of parameters does not need to be fixed

test(age: 30, sex: &#39;女&#39;, name: &#39;tom&#39;); //tom-------30--------女

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<?php
class Person {
    public static function test($name, $age) {
        echo $name.&#39;|&#39;.$age;
    }
}

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Person::test(age:100, name:&#39;Landy&#39;); //Landy|100

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It can also be like this

function test1($arg1,$arg2, ...$args) {
    print_r($args);
}
test1(1,2, name:&#39;Landy&#39;, age:11, sex:2);
Array
(
    [name] => Landy
    [age] => 11
    [sex] => 2
)

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It is not backward compatible. Functions after PHP8.0 can use named parameters

match expression

$a = 8.0;
echo match($a) {
    8.0 => &#39;匹配8.0&#39;,
    &#39;8.0&#39; => &#39;test 8.0&#39;,
    default => &#39;没有匹配值&#39;
};  //匹配8.0

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can match the expression

function test3() {
    return 8.0;
}
$a = 8.0;
echo match($a) {
    test3() => &#39;匹配函数&#39;,
    8.0 => &#39;匹配8.0&#39;,
    &#39;8.0&#39; => &#39;test 8.0&#39;,
    9,10,11 => &#39;多次匹配&#39;, //多次匹配
    default => &#39;没有匹配值&#39;
};  //匹配函数

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match is a strong type match. Another thing to note is that before match (){} You should write after the curly braces; , switch is not used

Properties can be defined directly in the constructor

class Point {
  public function __construct(
    public float $x = 1.0,
    public float $y = 2.0,
    public float $z = 3.0,
  ) {}
}
echo (new Point())->x; // 1

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Recommended study: " PHP video tutorial》

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