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This class implements collection object (dictionary object) like Java in PHP. It has a built in iterator. You can perform all abstract collection methods in it.
collection.php
| <?php
/*******************************************************************************************
*
* Class Name : phpCollection
* Version : 1.0
* Written By : Hasin Hayder
* Start Date : 10th March, 2005
* Release License : LGPL
*
********************************************************************************************
*
* This class implements Collection object in PHP.
*
*/
class phpCollection
{
var $length;
var $elements = array();
var $__cnt=0;
var $__temp;
function add($key, $item)
{
if (!array_key_exists($key,$this->elements))
{
$this->elements[$key] = $item;
$this->length = count($this->elements);
$this->__temp = array_values($this->elements);
return true;
}
return false;
}
function remove($key)
{
$dummy = array();
foreach($this->elements as $k=>$v)
{
if ($k != $key)
{
$dummy[$k] = $v;
}
}
$result = false;
if (count($this->elements)!=count($dummy)) $result = true;
$this->elements = $dummy;
$this->length = count($dummy);
$this->__temp = array_values($this->elements);
return $result;
}
function key_exists($k)
{
foreach($this->elements as $k=>$v)
{
if ($k == $key)
{
return true;
}
}
return false;
}
function has_next()
{
if(($this->__cnt)<($this->length-1))
{
$this->__cnt++;
return true;
}
else
return false;
}
function rewind()
{
//just set the iterator position to first
$this->__cnt = 0;
}
function current()
{
return $this->__temp[$this->__cnt];
}
function itemat($pos)
{
return $this->__temp[$pos];
}
function removeat($pos)
{
$keys = array_keys($this->elements);
$curkey = $keys[$pos];
return $this->remove($curkey);
}
function item($key)
{
return $this->elements[$key];
}
}
?> | |
Usage:
| <?php
include_once("collection.php");
$col = new phpCollection();
$col2 = new phpCollection();
$col->add("a","123"); //add an object
$col->add("b","13"); //add an object
$col->add("c","134"); //add an object
$col2->add("ba","Ayesha"); //add an object
$col2->add("ca","Hasin"); //add an object
$col->add("d",$col2); //add col2 object to col collection
$col->rewind(); //set iterator position to 0
echo "<br>"."Item : ".$col->current(); //retrieve current element
while ($col->has_next()) //iterates
{
echo "<br>"."Item : ".$col->current(); //retrieve current element
}
echo "<hr>";
$ncol = $col->item("d"); //retrieve object
$ncol->rewind(); //use that object
echo $ncol->itemat(0);
?> | |
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| SPL and ITERATOR : examples
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