Require Once Issues

[sazzie]

How do you force a piece of php code to be called only once?

My attempts at useing require_once fails as the calling script is used iteratively and the required_once script gets loaded again and again.

Please help.

[HuggieBear]

[quote author=sazzie link=topic=122083.msg503024#msg503024 date=1168604470]
How do you force a piece of php code to be called only once?
[/quote]

Only call it once :)

How do you know it's being requested more than once?

Regards
Huggie

[sazzie]

Because the file being required_once is a php generated tabs setup.

Each time the require script runs, and it does so iteratively( acting differently each time with different input) , a new set of
tabs are drawn up overlapping the former one(s).

[HuggieBear]

In that case you've misunderstood what require_once() actually does...

Imagine this:

[b]index.php[/b]
[code]<?php
require('connect.php');
require('header.php');
// Rest of the page code here...
?>[/code]

[b]header.php[/b]
[code]<?php
require('connect.php');
// Rest of the page code here...
?>[/code]

You can see here that connect.php is going to be called and loaded twice, once by index and once when header.php is called by index.  A 12k page has just become 24k of bandwidth.  But more importantly, you'll avoid variable redefinitions.

By using require_once('connect.php') it will fetch/retrieve this page and if it comes across a require('connect.php') again, it won't attempt to retrieve it, knowing full well that it has it already.

[sazzie]

Are you saying if A.php has a call to require_once B.php but A.php calls it's self repeatedly, there will be multiple
inclusions of B.php?

If the above is right, can you suggest a way out?

[HuggieBear]

[quote author=sazzie link=topic=122083.msg503037#msg503037 date=1168605560]
can you suggest a way out?
[/quote]

If you're able to provide some code then we could look into this for you.  Don't forget to surround your code with [nobbc][code]...[/code][/nobbc] tags :)

Regards
Huggie

[sazzie]

Here is the code.

This is A.php :
[code]
<?php
[color=red] require_once("B.php");

if( isset($_GET['task']) )
{
$task = $_GET['task'];

switch( $task )
{
case 0:
courses_welcome();
break;
case 1:
t1();
break;
case 2:
t2();
break;
case 3:
t3();
break;
default :
break;
}
}

function courses_welcome()
{
echo "<p>Welcome to our courses</p>";
}

function t1()
{
echo "Testing 1!";
}

function t2()
{
echo "Testing 2!";
}

function t3()
{
echo "Testing 3!";
}[/color]
?>
[/code]

This is B.php :
[code]
<?php
{[color=red]
echo "<div>";
echo "<div class=\"tabArea\">";
echo "<a class=\"tab\" href=\"#\" onClick=\"tab_manager('tabContent', 'A.php?task=0');\"> Welcome </a>";
echo "<a class=\"tab\" href=\"#\" onClick=\"tab_manager('tabContent', 'A.php?task=1');\"> View All Courses </a>";
echo "<a class=\"tab\" href=\"#\" onClick=\"tab_manager('tabContent', 'A.php?task=2');\"> View '07 Courses </a>";
echo "<a class=\"tab\" href=\"#\" onClick=\"tab_manager('tabContent', 'A.php?task=3');\"> Add Courses </a>";
echo "</div>";

echo "<div class=\"tabMain\">";
echo "<div id=\"tabIframeWrapper\">";
echo "<div id=\"tabContent\"></div>";
echo "</div>";
echo "</div>";
}
?>[/color]
[/code]

And the styling just incase :
[code]
div.tabArea {
font-size: 80%;
font-weight: bold;
border: solid 1px blue;
}

a.tab {
  background-color: #f0f0f0;
  border: 1px solid #000000;
  border-bottom-width: 0px;
  padding: 2px 1em 2px 1em;
  position: relative;
  text-decoration: none;
  top: -1px;
  z-index: 100;
}

a.tab, a.tab:visited {
  color: #808080;
}

a.tab:hover {
  background-color: #d0d0d0;
  color: #606060;
}

a.tab.activeTab, a.tab.activeTab:hover, a.tab.activeTab:visited {
background-color: #c0c0c0;
color: #000000;
}

a.tab.activeTab {
z-index: 102;
}

div.tabMain {
background-color: #c0c0c0;
border: 1px solid #000000;
padding: 1em;
position: relative;
z-index: 101;
}

#tabIframeWrapper {
width: 100%;
}

#tabContent {
border: 1px solid green;
padding: 0px 15px 15px 15px;
width: 100%;
}
[/code]

[sazzie]

I forgot to mention the code is part of a larger Ajax project.

So because I have had to cut out irrelivant code the code provided probably won't duplicate the error I described but it will show the concept of how me code interacts with regards to the required_once call.

[HuggieBear]

You're right, I'm unable to recreate the problem.  Looking at what you have, I can see what you mean, but I can't see how it's likely to cause a problem.  Maybe your javascript 'tab_manager' function is at fault.

Regards
Huggie

[sazzie]

Thanks Huggie'. Sorry for the time away - weekend, you see!.

The only other tricks I have up my sleeves right now are :

1. To remove the former rendering of the divs tab and then over write with a new one
    which should sit in the right place - fingers and toes crossed.
2. To render the tabs in a script which calls only once. So the script before the iterative one( A.php ).

Do you know code for 'erasing' and entire div from DOM to help with the first approach? I'm sorry for asking here. I am
sure it's not the right place.
:D

[HuggieBear]

I'm afraid I don't but try posting in the [url=http://www.phpfreaks.com/forums/index.php/board,6.0.html]Javascript forum[/url] that we have here at PHPFreaks

Huggie