php分页

<?php # Script 10.4 - #4
// This script retrieves all the records from the users table.
// This new version paginates the query results.


$page_title = 'View the Current Users';


echo '<h1>Registered Users</h1>';


require_once ('connect.php');


// Number of records to show per page:
$display = 3;


// Determine how many pages there are...
if (isset($_GET['p']) && is_numeric($_GET['p'])) { // Already been determined.


$pages = $_GET['p'];


} else { // Need to determine.


// Count the number of records:
$q = "SELECT COUNT(user_id) FROM users";
$r = mysqli_query ($dbc, $q);
$row = @mysqli_fetch_array ($r, MYSQLI_NUM);
$records = $row[0];


// Calculate the number of pages...
if ($records > $display) { // More than 1 page.
$pages = ceil ($records/$display);
} else {
$pages = 1;
}

} // End of p IF.


// Determine where in the database to start returning results...
if (isset($_GET['s']) && is_numeric($_GET['s'])) {
$start = $_GET['s'];
} else {
$start = 0;
}

// Define the query:
$q = "SELECT last_name, first_name, DATE_FORMAT(registration_date, '%M %d, %Y') AS dr, user_id FROM users ORDER BY registration_date ASC LIMIT $start, $display";
$r = mysqli_query ($dbc, $q);


// Table header:
echo '<table align="center" cellspacing="0" cellpadding="5" width="75%">
<tr>
<td align="left"><b>Edit</b></td>
<td align="left"><b>Delete</b></td>
<td align="left"><b>Last Name</b></td>
<td align="left"><b>First Name</b></td>
<td align="left"><b>Date Registered</b></td>
</tr>
';


// Fetch and print all the records....


$bg = '#eeeeee'; // Set the initial background color.


while ($row = mysqli_fetch_array($r, MYSQLI_ASSOC)) {


$bg = ($bg=='#eeeeee' ? '#ffffff' : '#eeeeee'); // Switch the background color.

echo '<tr bgcolor="' . $bg . '">
<td align="left"><a href="edit_user.php?id=' . $row['user_id'] . '">Edit</a></td>
<td align="left"><a href="delete_user.php?id=' . $row['user_id'] . '">Delete</a></td>
<td align="left">' . $row['last_name'] . '</td>
<td align="left">' . $row['first_name'] . '</td>
<td align="left">' . $row['dr'] . '</td>
</tr>
';

} // End of WHILE loop.


echo '</table>';
mysqli_free_result ($r);
mysqli_close($dbc);


// Make the links to other pages, if necessary.
if ($pages > 1) {

// Add some spacing and start a paragraph:
echo '<br /><p>';

// Determine what page the script is on:
$current_page = ($start/$display) + 1;

// If it's not the first page, make a Previous link:
if ($current_page != 1) {
echo '<a href="view_users.php?s=' . ($start - $display) . '&p=' . $pages . '">Previous</a> ';
}

// Make all the numbered pages:
for ($i = 1; $i <= $pages; $i++) {
if ($i != $current_page) {
echo '<a href="view_users.php?s=' . (($display * ($i - 1))) . '&p=' . $pages . '">' . $i . '</a> ';
} else {
echo $i . ' ';
}
} // End of FOR loop.

// If it's not the last page, make a Next button:
if ($current_page != $pages) {
echo '<a href="view_users.php?s=' . ($start + $display) . '&p=' . $pages . '">Next</a>';
}

echo '</p>'; // Close the paragraph.

} // End of links section.


?>