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Classes

Posted by TiyaniN

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TiyaniN

Classes
March 27, 2013 01:08PM

Registered: 12 years ago
Posts: 13
Rating: 0

Language: PHP
<html>
<head>
<title>
Creating an object
</title>
</head>
 
<body>
<h2>Creating an object</h2>
<?php
class Person
{
	var $name;
 
	function set_name($data)
	{
		$this->name = $data;
	}
 
	function get_name()
	{
		return $this->name;	
	}
 
	$ralph = new Person;
	$ralph->set_name("Ralph");
 
	echo "The name of your friend is ", $ralph->get_name(),".";
}
 
?>
</body>
</html>

I'm getting an error when I run this script from the book, can anyone help. Page 250 - 251

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45352380

Re: Classes
March 27, 2013 01:51PM

Registered: 13 years ago
Posts: 37
Rating: 0

Hi, What error code/message are you getting? And on what line do you get the error message?
Just from a quick look,
1) I see there in the "echo " statement there is a comma. Replace your comma's with FULL STOPS (.)
2) When you are creating a new object, there must be two brackets. E.g.

Language: PHP
$ralph = new Person();

Regards, Jared

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48451401 - Mel

Re: Classes
March 27, 2013 05:55PM

Registered: 11 years ago
Posts: 1
Rating: 0

Your last curly bracket is in the wrong place.
It should be after the last function, before you create the object.

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TiyaniN

Re: Classes
March 28, 2013 02:13PM

Registered: 12 years ago
Posts: 13
Rating: 0

Thank you, I rectified the error.

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46470107

Re: Classes
April 14, 2013 02:01PM

Registered: 11 years ago
Posts: 44
Rating: 0

Hi all,

Is anyone using the __autoload function to include/require classes from seperate page?

I can't get the function to work for me so i'm resulting to normal include statement which is ok for this project since i only
have 1 class page but in futur i will want to use __autoload function if i have more than 1 class pages.

The class Car is on a page called classes.php & being used in OOP_properties.php
Here is my code:

Language: PHP
function __autoload($class_name)
{
	require $class_name . ';.php';;
}
 
$ix35 = new Car;
$ix35->set_Model("Hyundai");
$ix35->set_Colour("Bronze");

Error code:
Warning: require(Car.php) [function.require]: failed to open stream: No such file or directory in C:\Program Files (x86)\EasyPHP-5.3.3\www\OOP_properties.php on line 33
Fatal error: require() [function.require]: Failed opening required 'Car.php' (include_path='.;C:\php5\pear' winking smiley

in C:\Program Files (x86)\EasyPHP-5.3.3\www\OOP_properties.php on line 33

Why is it trying to open Car.php & not look for the Car class on any .php pages?

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45352380

Re: Classes
April 19, 2013 09:56AM

Registered: 13 years ago
Posts: 37
Rating: 0

Hi, @ 46470107
To answer your first question, NO I'm not using the __autoload function. Shouldn't all our code be on one page?

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TiyaniN

Re: Classes
April 21, 2013 05:33PM

Registered: 12 years ago
Posts: 13
Rating: 0

I am failing to display data on the list boxes, what might be the problem?

Here is my sample code and error messages:

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\php4\oop5_select.php on line 109

and the code is:

Language: PHP
public function Fetch($model, $colour){ // line 106
$query=mysql_query("SELECT * FROM ".$set_table_name." ORDER BY ".$order); // line 107
$result = array(); // line 108
while ($record = mysql_fetch_array($query)) { // line 109
$result[] = $record; // line 110
} // line 111
return $result; // line 112
} // line 113

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Mac

Re: Classes
April 22, 2013 08:28AM

Admin
Registered: 18 years ago
Posts: 10,001
Rating: 353

Your SQL query is failing for some reason.

Add an error check

Language: PHP
if (!$result) { // add this check.
    die(';Invalid query: '; . mysql_error());

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46470107

Re: Classes
April 22, 2013 10:27AM

Registered: 11 years ago
Posts: 44
Rating: 0

Hi @45352380,

I think you can choose to have your classes on the page it's being used or on a seperate page.

I have my classes on a seperate page classes.php, then on all other pages just have the "include" statement.

But the book have an function __autoload as i show above, that in the book it says it will look for all classes in any .php pages and auto include them.
This function is not working for me...

if you have some spare time try it out, I don't have the book with me but it was in chap 7 or 8...

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46326251phuti

Re: Classes
April 24, 2013 08:51PM

Registered: 12 years ago
Posts: 6
Rating: 0

Hi TiyaniN

it seems that your $order and $set_table_name variables are not defined

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44538456 Candice

Re: Classes
May 05, 2013 10:41PM

Registered: 11 years ago
Posts: 6
Rating: 0

Hi Mac

Im having the same problems as TiyaniN, where the list box does not populate the data.
Where do I insert the error check?

Thanks

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Mac

Re: Classes
May 06, 2013 08:03AM

Admin
Registered: 18 years ago
Posts: 10,001
Rating: 353

After the sql query

Language: PHP
$query=......
$result=mysql_num_rows($query);
if (!$result) {     die(';Invalid query: '; . mysql_error()); }

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44538456 Candice

Re: Classes
May 06, 2013 09:12PM

Registered: 11 years ago
Posts: 6
Rating: 0

Hi Mac

When i run the error check this is the error msg I get:

Invalid query: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY' at line 1

Language: PHP
$query=mysql_query("SELECT * FROM ".$set_table_name." ORDER BY ".$order);

Please help.

Thanks

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Mac

Re: Classes
May 07, 2013 08:17AM

Admin
Registered: 18 years ago
Posts: 10,001
Rating: 353

As it says, you have an error in that query near ORDER BY.... and it is there about (it is never precise, but it points to the end of the line

I am not going to say where - see if you can find it. Make sure you have everything required in terms of quotes, full-tops etc.

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46470107

Re: Classes
May 07, 2013 08:46AM

Registered: 11 years ago
Posts: 44
Rating: 0

Hi Candice,

Also check this line of code jus above the code you posted:

Language: PHP
public function Fetch(……, ……){