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<?php
//數(shù)據(jù)庫操作類
class Model{
    private $host; //數(shù)據(jù)庫地址
    private $user; //數(shù)據(jù)庫用戶名
    private $pwd; //數(shù)據(jù)庫密碼
    private $tabName; //表名
    private $preFix; //表前綴
    private $dbName; //數(shù)據(jù)庫名
    private $charset; //字符
    private $link=null; //數(shù)據(jù)連接對(duì)象

    function __construct($tabName = ''){
        $this->host = DB_HOST;
        $this->user = DB_USER;
        $this->pwd = DB_PWD;
        $this->charset = CHARSET;
        $this->preFix = DB_PREFIX;
        $this->dbName = DB_NAME;

        if($tabName == ''){
           $this->tabName = $this->prefix.strtolower(substr(get_class($this),0,-5)) ;
        }else{
            $this->tabName = $this->preFix.$tabName;
        }
        $this->link = $this->connect();
       
    }

    private function connect(){
        $link = @mysqli_connect($this->host,$this->user,$this->pwd,$this->dbname) or die('數(shù)據(jù)庫連接錯(cuò)誤');
        if(!$link){
            return false;
        }
        mysqli_set_charset($link,$this->charset);
        return $link;
    }

    public function insert(array $data){
        //var_dump($data);
        //INSERT INTO user(name,sex,age) VALUE();
        $key = $val = '';
        foreach($data as $k=>$v){
            $key .='`'.$k.'`,';
            $val .="'".$v."',";
        }
        $key = rtrim($key,',');
        $val = rtrim($val,',');
        // var_dump($key);
        // var_dump($val);
        $sql = "INSERT INTO {$this->tabName} ({$key}) VALUES ({$val})";
        echo $sql;

        return $this->exec($sql);
    }

    private function exec($sql){
        $result = mysqli_query($this->link,$sql);
        if($result && mysqli_affected_rows($this->link) > 0){
            return mysqli_insert_id($this->link) ?? mysqli_affected_rows($this->link);
        }else{
            return false;
        }
    }
}

//調(diào)用方法，為什么不成功？總是插入不進(jìn)去，提示false;??
<?php
$m = new Model('user');
// echo '<pre>';
// var_dump($m);

$_POST = array('name'=>'小驢','age'=>'20','sex'=>'1');
$result = $m->insert($_POST);

var_dump($result);