如何在PHP中该类的另一个函数内调用同一类的函数

Question

when i am calling the function connect and closeDb inside showAll there is an error.

class DBConnect {

private $con;

private function connect() {

    $con = mysql_connect("localhost", "root", "");
    mysql_select_db('school');
}

private function closeDb() {
    mysql_close($this->con);
}

public function showAll() {
    self::connect();

    echo "THis is from the showAll method";
    self::closeDb();
}

}

Answer 1

Mysql extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used.

Learn basics of object oriented programming: http://php.net/manual/en/language.oop5.php

Answer 2

This Line looks false. $con = mysql_connect("localhost", "root", "");

If think you want to do $this->con = mysql_connect("localhost", "root", "");

Then

public function showAll() { $this->connect(); echo "THis is from the showAll method"; $this->closeDb(); } public function showAll() { $this->connect(); echo "THis is from the showAll method"; $this->closeDb(); } use $this !