[sushi4664]

I have a structural question.

I come from a Java background. In Java, there was a premade class called LinkedList. Essentially I want something like that.

The idea is, I have an array, example:

Code:

$exampleArr=array(1,2,3,4);

When I call the following snippet of code:

Code:

for($i=0;$i<7;$i++)
    echo $exampleArr[$i];

I want the following output:

1
2
3
4
1
2
3

So essentially I want an array type structure that goes back to its first element after its last one.

Is there a simple way with php?

[job0107]

Like this:

PHP Code:

<?php
$exampleArr=array(1,2,3,4);
for($count=0;$count<2;$count++)
{
 for($i=0;$i<count($exampleArr);$i++)
 {
  echo $exampleArr[$i]."<br />";
  }
 }
?>

[sushi4664]

But for the code I am writing, I don't know how many elements the array has, nor do I know how many iterations it is going to be used for,

[job0107]

I guess this would be a representation of a
Singly-linked list


This one shifts from top to bottom:

PHP Code:

<?php
$exampleArr = array(1,2,3,4);
 for($i=0;$i<7;$i++)
 {
  $value = array_shift($exampleArr);
  echo $value."<br />";
  array_push($exampleArr,$value);
  }
?>

This one shifts from top to bottom and has a pointer to start anywhere in the array:

PHP Code:

<?php
$exampleArr = array(1,2,3,4);
$pointer = 1; // Use values 1 thru count($exampleArr)
for($i=0;$i<7;$i++)
{
 $value = array_shift($exampleArr);
 array_push($exampleArr,$value);
 echo $exampleArr[count($exampleArr)-$pointer]."<br />";
 }
?>

This one shifts from bottom to top:

PHP Code:

<?php
$exampleArr = array(1,2,3,4);
 for($i=0;$i<7;$i++)
 {
  $value = array_pop($exampleArr);
  echo $value."<br />";
  array_unshift($exampleArr,$value);
  }
?>

This one shifts from bottom to top and has a pointer to start anywhere in the array:

PHP Code:

<?php
$exampleArr = array(1,2,3,4);
$pointer = 1; // Use values 1 thru count($exampleArr)
for($i=0;$i<7;$i++)
{
 $value = array_pop($exampleArr);
 array_unshift($exampleArr,$value);
 echo $exampleArr[count($exampleArr)-$pointer]."<br />";
 }
?>

[Nico]

Here is where the modulus operator comes handy:

PHP Code:

<?php



$array = array(1, 2, 3, 4);

$count = sizeof($array);



for ($i = 0; $i < 7; $i++)

{

    $key = ($i % $count);

    

    echo $array[$key], "<br />\n";

}



?>