pagination on php limit 50 - php

Question

Can anyone help me with the pagination? I am trying this code on pagination and the pages are showing but when clicked on the pages like Next or the number with links it gives a syntax error.
"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?page=2' at line 1"
My tables data is around 250 and I wanted to limit it to 50 data per page.
Here is my code: (pagination section - is the problem)
<link rel="stylesheet" type="text/css" href="css/navbar.css">
<?php include 'navbar.php';?>
<br>
<?php
if(!isset($_GET['table'])){
echo 'You must assign a table to view.';
exit;
}
session_start();
//Connect here
$conn = mysqli_connect("localhost", "root", "", "dkusers");
$table = mysqli_real_escape_string($conn, $_GET['table']);
$fields = array();
$q = mysqli_query($conn, "SHOW COLUMNS FROM " . $table) or die(mysqli_error($conn));
while($r = mysqli_fetch_assoc($q)) $fields[count($fields)] = $r['Field'];
echo '<b><font size="4">Table: </b>', $table, '</font><br>';
// -----------------INSERT-----------------
if(isset($_POST['action']) && $_POST['action'] == "Insert"){
if(!isset($_POST['insert'])){
echo '<h3>Insert Row</h3>';
echo '<form method="post"><input type="hidden" name="action" value="' . $_POST['action'] . '" />';
echo '<table border="1" cellpadding="7"><tr><th>Field</th><th>Value</th><th>MD5</th></tr>';
foreach($fields as $key => $value){
echo '<tr><td>' . $value . ':</td><td><input type="text" name="field_' . $value . '" /></td><td><input type="checkbox" name="md5_' . $value . '" /></td></tr>';
}
echo '<tr><td><input type="submit" name="insert" value="Submit" /></td><td colspan="2">Back</td></tr></table></form>';
exit;
}else{
$first = true;
$query = "INSERT INTO " . $table;
foreach($_POST as $key => $value){
if(strrpos($key, "field_", -strlen($key)) !== false){
$key = substr($key, 6);
$query .= sprintf("%s%s", ($first) ? " (" : ",", $key);
$first = false;
}
}
$query .= ") VALUES";
$first = true;
foreach($_POST as $key => $value){
if(strrpos($key, "field_", -strlen($key)) !== false){
$key = substr($key, 6);
$query .= sprintf("%s'%s'", ($first) ? " (" : ",", (isset($_POST['md5_' . $key])) ? md5($value) : $value);
$first = false;
}
}
$q = mysqli_query($conn, $query . ")");
if($q) echo 'Successfully inserted row into table!<br/><br/>'; else echo mysqli_error($conn) . '<br/><br/>';
}
}
// -----------------DELETE-----------------
if(isset($_POST['action']) && $_POST['action'] == "Delete"){
if(!isset($_POST['rows'])){
echo 'You didn\'t send any rows to delete.<br/><br/>';
}else{
$count = 0;
for($i = 0;$i < count($_POST['rows']);$i++){
if($_POST['rows'][$i] >= count($_SESSION['store'])) continue;
$query = "DELETE FROM " . $table . "";
$row = $_SESSION['store'][$_POST['rows'][$i]];
$first = true;
foreach($row as $key => $value){
$query .= sprintf(" %s %s = '%s'", ($first) ? "WHERE" : "AND", $key, $value);
$first = false;
}
$q = mysqli_query($conn, $query . " LIMIT 1");
if(!$q) echo mysqli_error($conn) . '<br/>';
$count += mysqli_affected_rows($conn);
}
echo 'Successfully deleted ' . $count . ' row(s)!<br/><br/>';
}
}
// -----------------MODIFY-----------------
if(isset($_POST['action']) && $_POST['action'] == "Modify"){
if(!isset($_POST['rows'])){
echo 'You didn\'t send any rows to modify.<br/><br/>';
}else if(isset($_POST['modify'])){
$count = 0;
for($i = 0;$i < count($_POST['rows']);$i++){
if($_POST['rows'][$i] >= count($_SESSION['store'])) continue;
$first = true;
$query = "UPDATE " . $table . " SET";
foreach($_POST as $key => $value){
if(strrpos($key, "field_", -strlen($key)) !== false){
$key = explode("_", $key, 3);
if($key[1] == $i){
$query .= sprintf(((!$first) ? "," : "") . " %s = '%s'", $key[2], (isset($_POST['md5_' . $key[1] . '_' . $key[2]])) ? md5($value) : $value);
$first = false;
}
}
}
$row = $_SESSION['store'][$_POST['rows'][$i]];
$first = true;
foreach($row as $key => $value){
$query .= sprintf(" %s %s = '%s'", ($first) ? "WHERE" : "AND", $key, $value);
$first = false;
}
$q = mysqli_query($conn, $query . " LIMIT 1");
if(!$q) echo mysqli_error($conn) . '<br/>';
$count += mysqli_affected_rows($conn);
}
echo 'Successfully updated ' . $count . ' row(s)!<br/><br/>';
}else{
echo '<h3>Modify Row</h3>';
echo '<form method="post"><input type="hidden" name="action" value="' . $_POST['action'] . '" />';
for($i = 0;$i < count($_POST['rows']);$i++) if($_POST['rows'][$i] < count($_SESSION['store'])) echo '<input type="hidden" name="rows[]" value="' . $_POST['rows'][$i] . '" />';
echo '<table border="1" cellpadding="7"><tr><th>Field</th><th>Value</th><th>MD5</th></tr>';
for($i = 0;$i < count($_POST['rows']);$i++){
if($_POST['rows'][$i] >= count($_SESSION['store'])) continue;
if($i != 0) echo '<tr><td colspan="3"><hr/></td></tr>';
$row = $_SESSION['store'][$_POST['rows'][$i]];
foreach($row as $key => $value){
echo '<tr><td>' . $key . ':</td><td><input type="text" name="field_' . $i . '_' . $key . '" value="' . $value . '" /></td><td><input type="checkbox" name="md5_' . $i . '_' . $key . '" /></td></tr>';
}
}
echo '<tr><td><input type="submit" name="modify" value="Submit" /></td><td colspan="2">Back</td></tr></table></form>';
exit;
}
}
// -----------------SEARCH-----------------
echo '<br><form method="post">Search: <input type="text" name="filter" value="' . ((isset($_POST['filter'])) ? $_POST['filter'] : '') . '"/><br/>Filter by: <br/>';
for($i = 0;$i < count($fields);$i++) echo '<input type="checkbox" name="' . $fields[$i] . '"' . ((isset($_POST['filter']) && isset($_POST[$fields[$i]])) ? ' checked' : '') . '/>' . $fields[$i] . ' ';
echo '</form><form method="post"><table border="1" cellpadding="7"><tr>';
for($i = 0;$i < count($fields);$i++) echo '<th>' . $fields[$i] . '</th>';
echo '<th>-</th></tr>';
$sql = "SELECT * FROM " . $table;
if(isset($_POST['filter'])){
$filter = mysqli_real_escape_string($conn, $_POST['filter']);
foreach($fields as $key => $value) if(!isset($_POST[$fields[$key]])) unset($fields[$key]);
if(count($fields) > 0){
$first = true;
foreach($fields as $key => $value){
$sql .= " " . (($first) ? "WHERE" : "OR") . " " . $value . " LIKE '%" . $filter . "%'";
$first = false;
}
}
}
// -----------------Bottoms (Above table)-----------------
echo '<input type="submit" name="action" value="Modify" /> <input onclick="return confirm(\'Are you sure you want to delete these rows?\')" type="submit" name="action" value="Delete" /> <input type="submit" name="action" value="Insert" /><br><br></form>';
$_SESSION['store'] = array();
$q = mysqli_query($conn, $sql) or die(mysqli_error($conn));
while($r = mysqli_fetch_assoc($q)){
echo '<tr>';
foreach($r as $key => $value) echo '<td>' . $value. '</td>';
echo '<td><input type="checkbox" name="rows[]" value="' . count($_SESSION['store']) . '" /></td></tr>';
$_SESSION['store'][count($_SESSION['store'])] = $r;
}
// -----------------Bottoms (Below table)-----------------
echo '</table>';
//echo '<br><input type="submit" name="action" value="Modify" /> <input onclick="return confirm(\'Are you sure you want to delete these rows?\')" type="submit" name="action" value="Delete" /> <input type="submit" name="action" value="Insert" /></form>';
?>
<br>
// -----------------Pagination-----------------
<br>
<?php
$start=0;
$limit=50;
if(isset($_GET['page']))
{
$page=$_GET['page'];
$start=($page-1)*$limit;
}
else{
$page=1;
}
//Fetch from database first 10 items which is its limit. For that when page open you can see first 10 items.
$query=mysqli_query($conn,"select * from $table LIMIT $start, $limit");
?>
<?php
//print 10 items
while($result=mysqli_fetch_array($query))
{
//echo "<li>".$result['username']."</li>";
}
?>
<?php
//fetch all the data from database.
$rows=mysqli_num_rows(mysqli_query($conn,"select * from $table"));
//calculate total page number for the given table in the database
$total=ceil($rows/$limit);
if($page>1)
{
//Go to previous page to show previous 10 items. If its in page 1 then it is inactive
echo 'PREVIOUS';
}
if($page!=$total)
{
////Go to previous page to show next 10 items.
echo 'NEXT';
}
?>
<?php
//show all the page link with page number. When click on these numbers go to particular page.
for($i=1;$i<=$total;$i++)
{
if($i==$page) { echo "<li class='current'>".$i."</li>"; }
else { echo '<li>'.$i.'</li>'; }
}
?>

Answer 1

You have error on html URL syntax
echo 'NEXT';
The correct would be
echo 'NEXT';
You have to use ? only for the first URL parameter, & for the following, if any.