call a method from a class in php - php

Question

This is kind of embarrassing but I having problems calling a method from a class in PHP, this is how it goes: I have created a class persona with its respectives properties, the code is
<?php
class persona {
private $id;
private $nombre; //varchar(50)
private $correo; //varchar(50)
private $especialidad; //varchar(50)
private $nacionalidad; //varchar(50)
private $sueldo; //float
private $isss; //float
private $afp; //float
//getter
public function getId() {
return $this->id;
}
public function getNombre() {
return $this->nombre;
}
public function getCorreo() {
return $this->descripcion;
}
public function getEspecialidad(){
return $this->especialidad;
}
public function getNacionalidad(){
return $this->nacionalidad;
}
public function getSueldo(){
return $this->sueldo;
}
public function getIsss(){
return $this->isss;
}
public function getAfp(){
return $this->afp;
}
//setter
public function setNombre($nombre) {
$this->nombre = $nombre;
}
public function setCorreo($correo) {
$this->correo = $correo;
}
public function setEspecialidad($especialidad){
$this->especialidad=$especialidad;
}
public function setNacionalidad($nacionalidad){
$this->nacionalidad=$nacionalidad;
}
public function setSueldo($sueldo){
$this->sueldo=$sueldo;
}
public function setIsss($isss){
$this->isss=$isss;
}
public function setAfp($afp){
$this->afp=$afp;
}
public function __construct($nombre, $correo, $especialidad, $nacionalidad, $sueldo, $isss, $afp, $id=null) {
$this->nombre = $nombre;
$this->correo = $descipcion;
$this->especialidad = $especialidad;
$this->nacionalidad = $nacionalidad;
$this->sueldo = $sueldo;
$this ->isss = $isss;
$this->afp = $afp;
$this->id = $id;
}
public function mostrar(){
$mensaje="hola";
return $mensaje;
}
}
?>
as you can see at the end of the code I have created a function called mostrar, the only purpose of this is to show a message, now I want to call this method from a diferent class, my code is
<?php
require_once('persona.php');
class prueba{
private $person;
public function __construct(){
$person= new persona("el nombre","el correo", "la especialidad", "la nacionalidad", "el sueldo", "el isss", "el afp");
mostrando();
}
public function mostrando(){
$person->mostrar();
}
}
?>
but when I debug it doesn' show anything in the browser, I want to display the message from the class person.php, could you please tell me what is the problem in my code?

Answer 1

Variable scope:
$person !== $this->person
class prueba{
private $person;
public function __construct(){
$this->person= new persona("el nombre","el correo", "la especialidad", "la nacionalidad", "el sueldo", "el isss", "el afp");
$this->mostrando();
}
public function mostrando(){
echo $this->person->mostrar();
}
}
$this->person is an object property, accessible from all methods in the class.
$person is a local variable, accessible only from the method/function in which it is defined (unless passed as an argument to other methods/functions)