Calling a method on array iteration, from an object - PHP - php

Question

What I'm trying to do, is iterate through an array (Which in my case is a MySql result), and output it, but also do something else with the data at the same.
Doing this using procedural methods is easy - just put it in the foreach loop.
But, I'm wondering if there is a way that it could be integrated into the object.
So, say for example, I wanted to put the first field into a session, I could do this:
<?php
class MyClass {
public $myArray=array();
public function __construct() {
//..
//Mysql query as $stmt
//..
$this->myArray=$stmt->fetchAll(PDO::FETCH_ASSOC);
}
}
$obj=new MyClass;
$i=0;
foreach($obj->myArray as $row) {
?>
<!-- Output HTML formatted data -->
<?
$_SESSION[$i]=$row['firstfield'];
$i++;
}
?>
But, then that takes the task away from the class.
I could put a foreach loop in the class, like so:
<?php
class MyClass {
public $myArray=array();
public function __construct() {
//..
//Mysql query as $stmt
//..
$this->myArray=$stmt->fetchAll(PDO::FETCH_ASSOC);
$i=0;
foreach($this->myArray as $row) {
$_SESSION[$i]=$row['firstfield'];
$i++;
}
}
}
$obj=new MyClass;
foreach($obj->myArray as $row) {
?>
<!-- Output HTML formatted data -->
<?
}
?>
But, now we have 2 loops on the same data-set. Doubling the time to do the same task.
Is there a way to create a method to do something when the array is being looped through? Effectively making it so that the data-set would only have to be looped through once ...
Edit
Also, forgot to mention, the reason I can't build the HTML within the object, is because it will be used on different pages with different HTML layouts.

Answer 1

How about this
<?php
class MyClass {
public $myArray=array();
public $htm = NULL;
public function __construct(&$format=NULL) {
//..
//Mysql query as $stmt
//..
$this->myArray=$stmt->fetchAll(PDO::FETCH_ASSOC);
$i=0;
foreach($this->myArray as $row) {
switch ($format) {
case 'Page1' :
$this->htm .= $this->format1($row);
break;
case 'Page2' :
$this->htm .= $this->format2($row);
break;
default:
$this->htm .= $this->format_default($row);
}
$_SESSION[$i]=$row['firstfield'];
$i++;
}
}
private function format1($row) {
return // formatted html
}
private function format2($row) {
return // formatted html
}
private function format_default($row) {
return // formatted html
}
}
$obj=new MyClass('Page1');
echo $obj->htm;
?>
Alternatively you could subclass MyClass with as many subclasses as you need for the formats you require.
class myBaseClass {
public $myArray=array();
public function __construct() {
//..
//Mysql query as $stmt
//..
$this->myArray=$stmt->fetchAll(PDO::FETCH_ASSOC);
}
}
class format1Class extends myBaseClass
{
public $htm;
public function __construct() {
parent::_construct();
$i=0;
foreach($this->myArray as $row) {
$this->htm .= // format specific to this class
$_SESSION[$i]=$row['firstfield'];
$i++;
}
}
}
class format2Class extends myBaseClass
{
public $htm;
public function __construct() {
parent::_construct();
$i=0;
foreach($this->myArray as $row) {
$this->htm .= // format specific to this class
$_SESSION[$i]=$row['firstfield'];
$i++;
}
}
}
Now depending on which format you require in any script you instantiate the required class.
$obj = new format2Class();
echo $obj->htm;