[tssg-tech] Re: PHP help needed
- From: Jim Cant <cant_jim@xxxxxxxxxxx>
- To: <tssg-tech@xxxxxxxxxxxxx>
- Date: Mon, 2 Jul 2012 10:10:18 -0400
Yeah, isn't having to use the 'this' keyword a bother. Took me hours to solve
Brian's problem when I got initiated into PHP.
I like the var_dump().
Here's a style suggestion; when echo-ing in php, always append a newline
(distinct from a <br/> tag). This will make the resulting HTML/JavaScript that
goes to the browser much more readable. You'll appreciate it when you get to
debugging the HTML/JavaScript in Firebug (or your favorite browser debugging
tool).
I've got a helper function I use to do just this:
function echoln( $arg )
{
echo( $arg . "\n" );
}
which I have in a file that I 'include_once' in php source.
Cheers,
Jim
Date: Mon, 2 Jul 2012 06:47:30 -0400
Subject: [tssg-tech] Re: PHP help needed
From: khaduch@xxxxxxxxx
To: tssg-tech@xxxxxxxxxxxxx
Hello -You probably have your solution - adding the "$this->" is the key, which
Mary-Anne Wolf put in her code.
I am a PHP novice, but that is a standard OO construct that I didn't think of
when looking at this initially. There is one line in her code that doesn't
work, it is a diagnostic output line in the "get" function:
echo "value=$values[$key]";
As I was experimenting / learning with this, I came up with this code, and
found the function 'var_dump' that was another interesting diagnostic tool. My
final code was this:
<?php
class myObj{ private $values = array();
function __construct() { $this->values['ONE']=1;
$this->values['TWO']=2; $this->values['THREE']=3;
$this->values['FOUR']=4; foreach ($this->values as $key => $value)
echo $key.'=>'.$value.'<br />';
//var_dump($this->values);echo '<br>';echo 'var_dump of the newly constructed
object within the constructor:<br>';
var_dump($this);echo '<br>'; }
//Return key value if assigned, else return not assigned public function
get($key) {
echo "myObj get fxn: key=$key".'<br>'; // var_dump ($this);
if (isset($this->values[$key]))
echo "<br>value=".$this->values[$key]."<br>"; if (
isset($this->values[$key])){
return $this->values[$key]; } return 'Not assigned!'; }}
echo 'Creating a new myObj at line 32<br>';$var = new myObj;echo "var_dump of
the newly created object:<br>";var_dump($var); echo '<br>';
echo '<br><br>';echo 'The value is: '.$var->get('FOUR');
?>
Although the cut-and-paste wreaked a little havoc with it. The output that I
get in the browser when I run this:
Creating a new myObj at line 32
ONE=>1
TWO=>2
THREE=>3
FOUR=>4
var_dump of the newly constructed object within the constructor:
object(myObj)#1 (1) {
["values":"myObj":private]=>
array(4) {
["ONE"]=>
int(1)
["TWO"]=>
int(2)
["THREE"]=>
int(3)
["FOUR"]=>
int(4)
}
}
var_dump of the newly created object:
object(myObj)#1 (1) {
["values":"myObj":private]=>
array(4) {
["ONE"]=>
int(1)
["TWO"]=>
int(2)
["THREE"]=>
int(3)
["FOUR"]=>
int(4)
}
}
myObj get fxn: key=FOUR
value=4
The value is: 4
-- Ken
On Sun, Jul 1, 2012 at 10:31 AM, Play Cool Games <play@xxxxxxxxxxxxx> wrote:
Or upon further examination !
But not sure how to rewrite as I didn't understand the $key purpose in the
original !
Warning
Reference of a $value and the last array element remain even after the foreach
loop.
It is recommended to destroy it by unset().
Reference:
http://php.net/manual/en/control-structures.foreach.php
unset($value); // break the reference with the last element
On Jun 30, 2012, at 9:17 PM, Brian Marple wrote:
> What is wrong with this code? It is as simple as all get out yet it doesn't
> work!!! Does anyone have any clues?
>
>
> <?php
>
> class myObj
> {
> private $values = array();
>
> public function __construct() {
> $values['ONE']=1;
> $values['TWO']=2;
> $values['THREE']=3;
>
> foreach ($values as $key => $value)
> echo $key.'=>'.$value.'<br />';
> }
>
> //Return key value if assigned, else return not assigned
> public function get($key) {
> if (isset($values[$key])){
> return $values[$key];
> }
> return 'Not assigned!';
> }
>
> }
>
> $var = new myObj;
> echo 'The value is: '.$var->get('ONE');
>
> ?>
>
> --
> Brian Marple
> Systems Analyst
>
>
>
>
Lee T. Davy - Mini
Play Cool Games
play@xxxxxxxxxxxxx
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