Need Php help?

PHP
1

Plz can anybody help me why this php code doesn’t work:

class PrintName
{
var $name;

                   function show_name()
                   {
                        echo "\

“;
echo “The name passed to this method is $name.”,”
";
echo “Hi $name! How are you doing?”, "
", "
";
}
}
$obj1 = new PrintName;
$obj1 -> name = “George”;
$obj1 -> show_name();

The output would be but not showing:

The name passed to this method is George.

Hi George How are you doing?

2

Unlike JavaScript and I believe Java, $this must be explicitly invoked in PHP. Members of $this are not automatically imported into the scope of the function. So…


class PrintName {
  var $name;

  function show_name() {
    echo "\
";
    echo "The name passed to this method is {$this->name}.","\
";
    echo "Hi {$this->name}! How are you doing?", "\
", "\
";
  }
}

Note that name was not passed to that method. It was assigned to the object, which is a different thing entirely. If name is to be passed to the method, it should be an argument of the method.
Still this should answer the question at hand. Keep studying.

3

Can u output the error message;
I cannot see anything wrong with ur code

4

The only error message he might get is E_NOTICE when he references the undeclared variable $name in the body of the function for the first time each time the function is called. Most servers are set up to not show E_NOTICE errors though.

5

Hello,

to achieve your goal, there are more or less 2 correct ways how to do it.

First one, you create a function setName which sets value to property $name.

class PrintName
{
	protected $name;

	public function setName($name){
		// set value to attribute $name of this object
		$this->name = $name;
	}

	public function show_name(){
		echo 'The name passed to this method is '.$this->name.'. Hi '.$this->name.'! How are you doing?';
	}
}

$obj1 = new PrintName;
$obj1->setName('George');
$obj1->show_name();

Second one, you create a constructor and you use it for setting class attributes.

class PrintName
{
	protected $name;

	public function __construct($name) {
		$this->name = $name;
	}

	public function show_name(){
		echo 'The name passed to this method is '.$this->name.'. Hi '.$this->name.'! How are you doing?';
	}
}

$obj1 = new PrintName('George');
$obj1->show_name();

The third way (but usually not recommended) is making $name attribute public:

<?php
class PrintName
{
	public $name;

	public function show_name(){
		echo 'The name passed to this method is '.$this->name.'. Hi '.$this->name.'! How are you doing?';
	}
}

$obj1 = new PrintName();
$obj1->name = 'George';
$obj1->show_name();

Anyway, you should read something about Object Oriented Programming, there are plenty of resources.

In Java “this” keyword is optional. If PHP acted like Java you could write:

<?php
class Foo*{
	private $foo;
	
	public function setFoo($newFoo){
		$foo = $newFoo;	
	}
}

But if you wanted to use $foo in setFoo() method as parameter then you would need to write it like this:

<?php
class Foo*{
	private $foo;
	
	public function setFoo($foo){
		$this->foo = $foo;	
	}
}
6

Or you can use magic getters and setters ftw

<?php
class Person {
   private $_name;

    public function __construct(){

    }

    public function __set($property, $value){
        $property = '_' . $property;
        if(property_exists($this, $property)){
            $this->$property = $value;
        }
    }

    public function __get($property){
        $property = '_' . $property;
        if(property_exists($this, $property)){
            return $this->$property;
        }
    }
}

Then outside the class you can just use:

$person = new Person();
$person->name = "Bob";
echo $person->name;