Class problems (crazy variable)

[XiaoRulez]

This is a class i wrote and it's giving me crap -_- it should be counting up but the thing is, it's just staying at 0 and not changing, or any changes made goes back to 0 again ($items variable)... (think it's got to do with php thinking that $itams = 0, the 0 is seen to be NULL?)

can anyone spot any mistakes?

[code]class lists {
private $item = array();
private $items;

function lists() {
$items = 0;
}

function push_back($var) {
$item[$items] = $var;
$items++;
echo '[New Item] Current Items: '.$items.'<br>'."\n";
}

function push_front($var) {
$temp = array();
$temp[0] = $null;
$count = 0;
foreach($item as $i_one) {
$count++;
$temp[$count] = $i_one;
}
$item = $temp;
$items++;
}

function pop_back() {
$temp = $item[$items-1];
$item[$items-1] == $null;
$items--;
return $temp;
}

function pop_front() {
$temp = $item[0];
$temp2;
$count = 0;
foreach($item as $i_one) {
$count++;
if ($count != 1) $temp2[$count] = $i_one;
}
$temp2[$count] = $null;
$item = $temp2;
$items--;
return $temp;
}

function size_of() {
return $items;
}

function erase($loc) {
if ($loc > $items || $loc < 0) return $false;
else {
$temp = $item[0];
$temp2;
$count = $loc;
foreach($item as $i_one) {
$count++;
if ($count != 1) $temp2[$count] = $i_one;
}
$temp2[$count] = $null;
$item = $temp2;
$items--;
return $true;
}
}

function at($loc) {
return $item[$loc];
}
}

$a = &new lists();

function new_a($name) {
global $a;
$size = $a->size_of();
$a->push_back($name);
}
$name2 = "who";
new_a($name2);
new_a($name2);
new_a($name2);[/code]

[quote][New Item] Current Items: 1
[New Item] Current Items: 1
[New Item] Current Items: 1[/quote]

[wildteen88]

The problem is you are not using the variables you have defined in your class. In order to refer to the class variables you'll need to use $this->varname in order access the variables within the class. Otherwise the variables you use within a function will not eference variables outside of the function.

So when you use $item or $items you'll want to use $this->item and $this->items with in your methods (the functions).

In order to understand this behaviour you might want to read up on variable-scope

[XiaoRulez]

:S i'm kinda used to C++ any we don't need to use that all the time :P

thanks a heap.