php - Echo the next article or previous article with urls -

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the nest.php page below contains multidimensional array $laws, , contains groups of laws chapters comprise of several articles in them.

i have made previous article , next article dynamic url links echo 1 article after sequentially.

but php code should add these (2) urls skip next chapter when last article of particular chapter has been echoed?

<?php session_start();  $laws=array(        "group1"=>array(                       "1"=>array(                                 "1"=>"this article (1) in chapter (1) of (group1)",                                 "2"=>"this article (2) in chapter (1) of (group1)",                                 "3"=>"this article (3) in chapter (1) of (group1)",                                 ),                       "2"=>array(                                 "1"=>"this article (1) in chapter (2) of (group1)",                                 "2"=>"this article (2) in chapter (2) of (group1)",                                 "3"=>"this article (3) in chapter (2) of (group1)",                                 ),                        ),        "group2"=>array(                       "1"=>array(                                 "1"=>"this article (1) in chapter (1) of (group2)",                                 "2"=>"this article (2) in chapter (1) of (group2)",                                 "3"=>"this article (3) in chapter (1) of (group2)",                                 ),                       "2"=>array(                                 "1"=>"this article (1) in chapter (2) of (group2)",                                 "2"=>"this article (2) in chapter (2) of (group2)",                                 "3"=>"this article (3) in chapter (2) of (group2)",                                 ),         )        );   if(isset($_get['group']) && isset($_get['chapter']) && isset($_get['article'])){ $grp = $_get['group']; $chap = $_get['chapter']; $art = $_get['article'];     }else{ $grp = 'group1'; $chap = '1'; $art = '1';   }  if(isset($laws[$grp][$chap][$art])){ $_session['group'] = $grp; $_session['chapter'] = $chap; $_session['article'] = $art;     }  $group = $_session['group']; $chapter = $_session['chapter']; $article = $_session['article'];  $previousarticle = $_session['article'];   echo $laws[$group][$chapter][$article]; // articles echoed here!!!!!  echo '<br/>';  ?>   <!-------------- previous article , next article urls -------------------> <a href="nest.php?group=<?php echo $group; ?>&chapter=<?php echo $chapter; ?>&article=<?php echo --$previousarticle ; ?>" style="text-decoration: none;">previous article</a> <br/> <a href="nest.php?group=<?php echo $group; ?>&chapter=<?php echo $chapter;  ?>&article=<?php echo ++$article ; ?>" style="text-decoration: none;">next article</a>

you can add 1 more condition before link below

<!-------------- previous article , next article urls ------------------->   <?php    $prvartcle = $previousarticle -1 ;    if(!empty($laws[$group][$chapter][$prvartcle])) {?> <a href="test1.php?group=<?php echo $group; ?>&chapter=<?php echo $chapter; ?>&article=<?php echo --$previousarticle ; ?>" style="text-decoration: none;">previous article</a> <?php } ?> <br/>  <?php  $nextart = $article+1; if(!empty($laws[$group][$chapter][$nextart])) {?> <a href="test1.php?group=<?php echo $group; ?>&chapter=<?php echo $chapter;  ?>&article=<?php echo ++$article ; ?>" style="text-decoration: none;">next article</a> <?php } ?>

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