1，class Number {private int|float $number;public function setNumber(int|float $number): void { $this->number = $number;}public function getNumber(): int|float { return $this->number;}}2，class BookStore{public function __construct

https://www.php.net/manual/en/migration74.new-features.php官方文档1. 箭头函数的支持function callback($arg){ return ($arg * $arg );}$arr= [1, 2, 3, 4, 5];$result= array_map('callback', $arr);print_r($result);7.4之后可以如此操作$arr= [1, 2, 3, 4, 5];$...

array()创建数组。array_change_key_case()把数组中所有键更改为小写或大写。array_chunk()把一个数组分割为新的数组块。array_column()返回输入数组中某个单一列的值。array_combine()通过合并两个数组来创建一个新数组。a

<?phpnamespace app\common\model;use SplObserver;use SplSubject;use SplObjectStorage;class User implements SplSubject{ private $email; private $username; private $mobile; privat

[XDebug]zend_extension = "D:\xampp\php\ext\php_xdebug.dll"xdebug.profiler_append = 0xdebug.profiler_enable = 1xdebug.profiler_enable_trigger = 0xdebug.profiler_output_dir = "D:\xampp\tmp"x

函数stripslashes（）和addslashes（），mysql_real_escape_string（）等，使安全的SQL查询。