In php how do I call function from another class inside a different class?

oop, php

Solution

Try something like this (rough example):

<?php

include 'database.php';


class department
{

    public function doSomething() {
       $database = new $database();
       $val = $database->GetExam();
       //do something
    }
}

?>

Problem

how do I call function from another class inside a different class? Here's my current code: ``` <?php class database { private $host = "localhost"; private $user = "root"; private $password = ""; private $db = "9dot"; //connect to database public function connect() { $connect = mysql_connect($this->host,$this->user,$this->password); $database = mysql_select_db($this->db,$connect); } //Get exam headers public function GetExam() { $this->connect(); $select = "SELECT e.ExamHeaderID, CONCAT(e.Firstname,' ',e.Lastname) AS Fullname e.Age, e.Position, e.Date FROM examheader e"; $result = mysql_query($select); $table = ""; $table .= "<th>ExamID</th>"; $table .= "<th>Name</th>"; $table .= "<th>Age</th>"; $table .= "<th>Position</th>"; $table .= "<th>Date</th>"; $exam_id = ""; $fullname = ""; $age = ""; $position = ""; $date = ""; while($row = mysql_fetch_array($select)) { $exam_id = mysql_real_escape_string($row['ExamHeaderID']); $fullname = mysql_real_escape_string($row['Fullname']); $age = mysql_real_escape_string($row['Age']); $position = mysql_real_escape_string($row['Position']); $date = mysql_real_escape_string($row['Date']); } } public function GetExamDetails($ExamID) { $this->connect(); //$select = "SELECT ed.ExamDetailsID, ed."; } //Save Exam header public function SaveExam($firstname,$lastname, $age, $position) { $this->connect(); $date = date("m/d/Y"); mysql_real_escape_string($firstname); mysql_real_escape_string($lastname); mysql_real_escape_string($age); mysql_real_escape_string($position); $insert = "INSERT INTO examheader (Firstname,Lastname, Age, Position, Date) VALUES ('$firstname','$lastname','$age','$position')"; $result = mysql_query($insert); $exam_id = mysql_insert_id(); //return exam id for insertion of exam details return $exam_id; } public function SaveExamAnswer() { } } ?> <?php include 'database.php'; $database = new $database(); class department { $database->//property or function } ?> ``` How do I call functions from database class

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