How to limit method parameters in php? The parameter is an array. How to specify the number and key names of the passed array elements?

Question

<?php

class mysql
{
    private $con;
    private $query;


    public function err($error)
    {
        die('操作错误，错误信息为：' . $error);
    }


    public function connect(array $config)
    {
        extract($config);
        $this->con = mysqli_connect($dbhost, $dbuser, $dbpsw);
        if (!$this->con) {
            $this->err(mysqli_connect_error());
        }
        if (!mysqli_select_db($this->con, $dbname)) {
            $this->err(mysqli_error($this->con));
        }
        mysqli_query($this->con, "set name " . $dbcharset);
    }
}
?>

In the connect method, the number of incoming arrays must be 5: keyarray($dbhost,$dbuser,$dbpsw,$dbname,$dbcharset)

I am used to Java's strong typing, but I feel that PHP is not rigorous in many places. Will this increase the amount of code in the method body? (Write judgment in the method body?)

Answer 1

Define a standard value array, use array_merge to merge the standard array with the passed parameters, and get the value according to the key name of the standard array when using it.
Reference: https://github.com/top-think/...

Answer 2

function connect(array $config) {
    $requiredColumns = ['host','port','database','username','password'];
    foreach($requiredColumns as $column) {
        if(!isset($config[$column])) {
            throw new Exception("缺少参数{$column}");
        }
    }
}

Answer 3

You can consider using array_diff

array array_diff ( array $array1 , array $array2 [, array $... ] )

Comparison returns values ​​that are in array1 but not in array2 or any other parameter array.