How to create a smart navigation with array in PHP or Javascript for previous and next?

Question

I have a list of filenames

aeyrt.php
nviorf.php
vyutkd.php
oiuybd.php
poiuuy.php

Suppose that the current opened page is vyutkd.php

I have two arrows < and >

My question is how using PHP or Javascript the < will link to nviorf.php and the > to oiuybd.php ?

The same scenario goes if the current page is the first one. The < button should go to the last of the list.

Thank you

Generally you assign each one a number, and then next and previous can be determined just by simple +1/-1 maths. If you store these items in a database, the assigned number is a primary key. — halfer
– halfer, Commented Nov 29, 2014 at 13:35
@halfer thank you for this but I must avoid database for this — EnexoOnoma
– EnexoOnoma, Commented Nov 29, 2014 at 13:36

Giacomo Negretti · Accepted Answer · 2014-11-29 14:22:50Z

1

You could put the files name into an array:

$pages= Array( 'aeyrt.php','nviorf.php','vyutkd.php','oiuybd.php','poiuuy.php');

And create a function that check the current file name position and return a link to the previous or next page.

function getLink($pages,$previous = true){
 $position = array_search(basename(__FILE__),$pages);
 if($position==0 && $previous){
  return "<a href='".$pages[count($pages)-1]."'>Previous</a>";
 }
 if($position==count($pages)-1 && !$previous){
  return "<a href='".$pages[0]."'>Next</a>";
 }
 if($previous && $position!==null && $position>0){
  return "<a href='".$pages[$position-1]."'>Previous</a>";
 }
 if($position!==null && $position<count($pages)-1){
  return "<a href='".$pages[$position+1]."'>Next</a>";
 }
}

I did not check if it work, but I think so ;)

I modified the funtion to be circular

edited Nov 29, 2014 at 14:22

answered Nov 29, 2014 at 13:43

Giacomo Negretti

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6 Comments

EnexoOnoma Over a year ago

How to call the function ?

Giacomo Negretti Over a year ago

echo getLink($pages); for previous link echo getLink($pages,false); for next link

EnexoOnoma Over a year ago

I also get this Parse error: syntax error, unexpected '-', expecting ']'

EnexoOnoma Over a year ago

When I am on the first page, it is shown as next and next both with the same link. It is supposed to have again the previous that goes to the last link and the next to the next.

EnexoOnoma Over a year ago

Sorry my friend but it does not working as it is supposed.... When I am in one page, the links are so messing I can not find a pattern

|

Flash Thunder · Accepted Answer · 2014-11-29 13:50:14Z

0

Would be something like this:

corrected code:

<?php
  $pages = array('aeyrt.php','nviorf.php','vyutkd.php','oiuybd.php','poiuuy.php');
  $current_file = basename(__FILE__);
  if(($current_id = array_search($current_file,$pages))){
     if($current_id == count($pages) - 1){
        echo "<a href=\"".$pages[$current_id -1]."\">previous</a>";
     }else{
        echo "<a href=\"".$pages[$current_id -1]."\">previous</a> <a href=\"".$pages[$current_id +1]."\">next</a>";
     }
  }else{
     echo "<a href=\"$pages[2]\">next</a>";
  }  
?>

But... I would personally put those links into database and use rewrite rules.

edited Nov 29, 2014 at 13:50

answered Nov 29, 2014 at 13:37

Flash Thunder

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2 Comments

EnexoOnoma Over a year ago

Thank you, however I have corrected the parenthesis on line 4 but there are other bugs in this..

EnexoOnoma Over a year ago

When I am at the first link I get only a next link that goes me to the last of the list. The ideal is to still have previous and next...

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