Petit probleme php

<?php  
 if($thispage == 'construction')  
{ 
 echo '<ul class="const_pagin">'; 
} 
 else 
{ 
 echo ' <ul class="hidden_class">'; 
}?> 

<?php echo "La variable PagesOK contient la valeur ".$pagesOK ;

const_pagin a {
color:orange;
}

<?php 

$pagesOK['page01'] = 'includes/page01.php'; 
$pagesOK['page02'] = 'includes/page02.php'; 


$page = 'accueil'; 
if(!empty($_GET['page'])  
&& array_key_exists($_GET['page'], $pagesOK)) 
{ 
  
 $page = $_GET['page']; 
} 

?> 

<?php include($pagesOK[$page]); ?> 

<ul > 

<li><a <?php if($pagesOK == 'page01') {echo ' class="pagin_active"';} ?> href="monsite.php?page=page01">1</a></li> 
<li><a <?php if($pagesOK == 'page02') {echo ' class="pagin_active"';} ?> href="monsite.php?page=page02">2</a></li> 

</ul> 

<?php
/*ATTRIBUTION DES VARIABLES DANS LE TABLEAU ASSOCIATIF PAGESOK*/
$pagesOK['accueil'] = 'includes/accueil.php'; 
$pagesOK['page01'] = 'includes/page01.php'; 
$pagesOK['page02'] = 'includes/page02.php'; 

/*VERIFIE SI GET SE TROUVE DANS LE TABLEAU*/

$page_du_get = $_GET['page'];
if(!empty($page_du_get) && !empty($pagesOK[$page_du_get]))  $page = $page_du_get;
else $page = 'accueil'; /*SI GET VIDE OU NON DANS LE TABLEAU

/*INCLURE LE CONTENU DE LA PAGE CONCERNE*/
include($pagesOK[$page]);

/*PAGINATION*/
echo '<ul>';
foreach($pagesOK as $nom_page => $valeur)
{
echo '<li><a href="monsite.php?page='.$nom_page.'" class="pagin_active" >'.$nom_page.'</a></li>';
}
echo '</ul>';
?>

/*PAGINATION*/ 
echo '<ul>'; 
foreach($pagesOK as $nom_page => $valeur) 
{ 
if ($page == $nom_page) echo '<li><a href="monsite.php?page='.$nom_page.'" class="pagin_active" >'.$nom_page.'</a></li>'; 
else echo '<li><a href="monsite.php?page='.$nom_page.'">'.$nom_page.'</a></li>'; 
} 
echo '</ul>';