Question

I want to create a simple command when an array is called. In this case it would be the ON button inside a remote control. (Illustrative concept). But is not working (syntax error).

This is my piece of code:

    <?php
class remoteControl{

    public $operate = array("ON", "OFF", "UP","DOWN");



    public function pressButton($operate("0")){
    echo "You have pressed ". $this->operate;
    }
}

$control_01 = new remoteControl();

echo $control_01-> pressButton();

?> 

Any help would be very greatful 🙂

Answer 1

You have few syntax errors suggesting that you should read PHP manual about basics.

Your code (formatted):

<?php 
class remoteControl {
    public $operate = array("ON", "OFF", "UP","DOWN"); // 1) 

    public function pressButton($operate("0")) {  // 2), 3), 4)
        echo "You have pressed ". $this->operate; // 5)
    }
}

$control_01 = new remoteControl();                
echo $control_01-> pressButton();

?>

1) you should make this variable private if used only inside class methods

2) using arrays: $operate[0] – read more

3) don’t use string as index (“0”) – it will work, but its unnecessary type casting

4) finally, this line should be something like this:

public function pressButton($operate = 0) {

which means that if you don’t explicitly provide an argument it will have value 0 – read more about function arguments

5) because of 4) it should be:

echo "You have pressed ". $this->operate[$operate];

EDIT: Whole code:

<?php
class remoteControl {
    private $operate = array("ON", "OFF", "UP", "DOWN");

    public function pressButton($operate = 0) {
        echo "You have pressed ". $this->operate[$operate];
    }
}

$control_01 = new remoteControl();                
echo $control_01->pressButton();

?>