PHP8.1新特性之First-class Callable Syntax

hi，我是温新，一名PHPer

First-Class callables是一种引用闭包和函数的新方法。

php8.1之前版本

<?php
    
$closure = Closure::fromCallable('array_merge');
print_r($closure([1,2], [3,4]));
// Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

该案使用Closure将array_merge转成一个闭包形式使用。

php8.1版本

<?php
    
$closure = array_merge(...);
print_r($closure([1,2], [3,4]));
// Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

$closure = strlen(...);
$str = 'hello';
print_r($closure($str));

保持对技术的热忱

就是对自己最好的驱动