PHP Notice: Undefined Offset Erro

Here is my error:

PHP Notice: Undefined offset: 4 in /var/www/vhosts/httpdocs/layout/sort-menu.php on line 6

sort-menu.php is a included file in another php page.  The Parent page includes it this way:

<?php $current = 1; include("../../layout/sort-menu-following.php"); ?>

In the file i have this code:

<?php $active[$current] = "class=menu-sort-active";?>
            <ul>
            	<li <?php echo $active[1] ?> id="menu-sort-1"><a href="">menu 1</a></li>
            	<li <?php echo $active[3] ?> id="menu-sort-2"><a href="">menu 2</a></li>
                <li <?php echo $active[4] ?> id="menu-sort-1"><a href="">Menu 3</a></li>
                <li <?php echo $active[5] ?> id="menu-sort-4"><a href="">menu 4</a></li>
                <li <?php echo $active[6] ?> id="menu-sort-5"><a href="">menu 5</a></li>
            </ul>

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any reason why i im getting an error?

jporter80Asked:
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Dave BaldwinFixer of ProblemsCommented:
The error means that $active[4] doesn't exist.  The '4' is the offset it's referring to.  Check the code to see what it's supposed to be and make sure 5 and 6 are there also so they don't cause errors.
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tkmluvCommented:
If they may be un-defined, you can use an if statement to only run it if set.

<?php if (isset($active[4])){ echo $active[4];} ?>

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Ray PaseurCommented:
This is not an error, it is a Notice - these are very different.  In the default installation of PHP, the Notice messages are suppressed.  This message suppression allows you to use undefined variables and undefined array indexes as if the value was NULL.  

You can use error reporting(E_ALL ^ E_NOTICE) to suppress the messages.

You can also test the variables to see if they are defined, or you can pre-populate the array with empty strings, etc.  

If you expected the array to contain data in $active[5] (which is what is shown on line 6 of the code snippet) then you might want to use var_dump() to print out the array and see what is there and what is missing.
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Ray PaseurCommented:
An example that illustrates what you've found in the code above.  Install this and run it.  Pay particular attention to what happens on line 18 and 34.
<?php // RAY_temp_jporter80.php
echo "<pre>";



// SET DEFAULT ERROR REPORTING LEVELS
error_reporting(E_ALL ^ E_NOTICE);

// CREATE AND VISUALIZE AN ARRAY
$thing = array('A', 'B', 'C', 'D', 'E');
var_dump($thing);

// REMOVE AN ELEMENT
unset($thing[3]);
var_dump($thing);

// TRY TO USE THE REMOVED ELEMENT
$x = $thing[3];



// SET FULL ERROR REPORTING LEVEL
error_reporting(E_ALL);

// CREATE AND VISUALIZE AN ARRAY
$thing = array('A', 'B', 'C', 'D', 'E');
var_dump($thing);

// REMOVE AN ELEMENT
unset($thing[3]);
var_dump($thing);

// TRY TO USE THE REMOVED ELEMENT
$x = $thing[3];

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onemadeyeCommented:
Or perhaps use this to replace <ul>...</ul>
<ul>
<li <?php echo ( isset($active[1]) ? $active[1] : '' ); ?> id="menu-sort-1"><a href="">menu 1</a></li>
<li <?php echo ( isset($active[3]) ? $active[3] : '' ); ?> id="menu-sort-2"><a href="">menu 2</a></li>
<li <?php echo ( isset($active[4]) ? $active[4] : '' ); ?> id="menu-sort-1"><a href="">menu 3</a></li>
<li <?php echo ( isset($active[5]) ? $active[5] : '' ); ?> id="menu-sort-4"><a href="">menu 4</a></li>
<li <?php echo ( isset($active[6]) ? $active[6] : '' ); ?> id="menu-sort-5"><a href="">menu 5</a></li>
</ul>

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Ray PaseurCommented:
You might also want to check the numbers that are used to index the $active array, that are used in the id fields and that are displayed in the list items.  You might have what you want in those fields, but the collection looks kind of counterintuitive.
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