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<?php
if(isset($_GET['page']))
{
$page = $_GET['page']; // On récupère le numéro de la page indiqué dans l'adresse (livreor.php?page=4)
}
else
{
$page = 1; // On se met sur la page 1 (par défaut)// La variable n'existe pas, c'est la première fois qu'on charge la page
}


$dir = getcwd(); //current directory
$tab = scandir($dir);

// allowed files extensions :BMP is not included because BMP is not recommended for the web
$extensions_valides = array('jpg', 'jpeg', 'gif', 'png' , 'JPG', 'JPEG', 'GIF', 'PNG');

$nbrelem = 0;
$img = array();

//vérify if element is a file AND has allowed extension
foreach($tab as $element)
{
$a = $dir . "/" . $element;
$extension = substr(strrchr($element, '.'), 1);

if(is_file($a) AND in_array($extension, $extensions_valides))
{
$nbrelem++; //in the same time we count nbr of accepted elements to avoid to use the function count() later
array_push($img, $a); //if file is accepted we add it to the list
}
}
if(count($img) < 1)
{
echo '<br />';
echo '<b>No result found</b>';
exit;
}

//calculate nbr of pages : here we decided to put 4 per 8 = 32 for each page
$nbrpages = ceil($nbrelem / 32);
$x = ($page * 32) - 31;


for($i = 1; $i < 9; $i++)
{
echo '<table border = "1">';
$j = 0;
echo '<tr>';
for($j = 1; $j < 5; $j++)
{
echo '<td width = "155" height = "155"><img src = "' . $img[$x] . '" width = "150" height = "150" /></td>';
$x++;
}
echo '</tr>';
echo '</table>';
}

echo '<br />';

echo '<table width = "620" align = "center">';
echo '<tr>';
echo '<td>';
for ($a = 1 ; $a <= $nbrpages ; $a++)
{
echo '<a href="index.php?page=' . $a . '">' . $a . '</a> ' . " | ";
}
echo '</td>';
echo '</tr>';
echo '</table>';
?>

j'ai pensé à la solution suivante
transformer cette ligne 52 en ce qui suit

echo '<td width = "155" height = "155"><a href = "image.php?' . $img[$x] . '"><img src = "' . $img[$x] . '" width = "150" height = "150" /></a>' . '</td>';

et ceci afin d'envoyer une variable "nom image.ext" vers la page "image.php"
qui contient le code pour affciher une image

<?php
$image = $_GET['$img'];
$ext = substr(strrchr($image, '.'), 1);

switch ($ext) {
case "jpg": header("Content-type: image/jpg"); imagecreatefromjpeg($image); imagejpeg($image); break;
case "jpeg": header("Content-type: image/jpeg"); imagecreatefromjpeg($image); imagejpeg($image); break;
case "png": header("Content-type: image/png"); imagecreatefrompng($image); imagepng($image); break;
case "gif": header("Content-type: image/gif"); imagecreatefromgif($image); imagegif($image); break;
case "JPG": header("Content-type: image/jpg"); imagecreatefromjpeg($image); imagejpeg($image); break;
case "JPEG": header("Content-type: image/jpeg"); imagecreatefromjpeg($image); imagejpeg($image); break;
case "PNG": header("Content-type: image/png"); imagecreatefrompng($image); imagepng($image); break;
case "GIF": header("Content-type: image/gif"); imagecreatefromgif($image); imagegif($image); break;
default: break;
}
imagedestroy($image);

?>