Este es el error que me sale:
Notice: A session had already been started - ignoring session_start() in D:\xampp\htdocs\plaincart\admin\library\functions. php on line 2
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Warning: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\plaincart\admin\library\functions. php:2) in D:\xampp\htdocs\plaincart\admin\library\functions. php on line 18
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y este es mi código:
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<?php
session_start(); // incio de uso de sesiones.
?>
<?php
function checkUser()
{
$var=isset($_SESSION['plaincart_user_name']);
echo"$var";
if (!isset($_SESSION['plaincart_user_id'])) {
header('Location: ' . WEB_ROOT . 'admin/login.php');
exit;
}
if (isset($_GET['logout'])) {
doLogout();
}
}
function checkPriv($privNeces)
{
$priv=isset($_SESSION['variable']);
if (isset($_SESSION['variable']) != $privNeces) {
header('Location: ' . $_SESSION['login_return_url']);
exit;
}
}
function doLogin()
{
$errorMessage = '';
$userName = $_POST['txtUserName'];
$password = $_POST['txtPassword'];
if ($userName == '') {
$errorMessage = 'Introduce tu nombre de usuario';
} else if ($password == '') {
$errorMessage = 'Introduce tu password';
} else {
$sql = "SELECT user_id
FROM tbl_user
WHERE user_name = '$userName' AND user_password = PASSWORD('$password')";
$result = dbQuery($sql);
$sql = "SELECT privilegios
FROM tbl_user
WHERE user_name = '$userName' AND user_password = PASSWORD('$password')";
$result2 = dbQuery($sql);
if ((dbNumRows($result) == 1)&&(dbNumRows($result2) == 1)) {
$row = dbFetchAssoc($result);
$row2 = dbFetchAssoc($result2);
$_SESSION['plaincart_user_id'] = $row['user_id'];
//session_start();
$_SESSION['variable'] = $row2['privilegios'];
$_SESSION['Uname'] = $userName;
$sql = "UPDATE tbl_user
SET user_last_login = NOW()
WHERE user_id = '{$row['user_id']}'";
dbQuery($sql);
if (isset($_SESSION['login_return_url'])) {
header('Location: ' . $_SESSION['login_return_url']);
exit;
} else {
header('Location: index.php');
exit;
}
} else {
$errorMessage = 'Nombre de usuario o password incorrectos';
}
}
return $errorMessage;
}
function doLogout()
{
if (isset($_SESSION['plaincart_user_id'])) {
unset($_SESSION['plaincart_user_id']);
session_unregister('plaincart_user_id');
}
if (isset($_SESSION['variable'])) {
unset($_SESSION['variable']);
session_unregister('variable');
}
header('Location: login.php');
exit;
}
function buildCategoryOptions($catId = 0)
{
$sql = "SELECT cat_id, cat_parent_id, cat_name
FROM tbl_category
ORDER BY cat_id";
$result = dbQuery($sql) or die('Cannot get Product. ' . mysql_error());
$categories = array();
while($row = dbFetchArray($result)) {
list($id, $parentId, $name) = $row;
if ($parentId == 0) {
$categories[$id] = array('name' => $name, 'children' => array());
} else {
$categories[$parentId]['children'][] = array('id' => $id, 'name' => $name);
}
}
$list = '';
foreach ($categories as $key => $value) {
$name = $value['name'];
$children = $value['children'];
$list .= "<optgroup label=\"$name\">";
foreach ($children as $child) {
$list .= "<option value=\"{$child['id']}\"";
if ($child['id'] == $catId) {
$list.= " selected";
}
$list .= ">{$child['name']}</option>\r\n";
}
$list .= "</optgroup>";
}
return $list;
}
function buildCategoryOptions($catId = 0)
{
$sql = "SELECT cat_id, cat_parent_id, cat_name
FROM tbl_category
ORDER BY cat_id";
$result = dbQuery($sql) or die('Cannot get Product. ' . mysql_error());
$categories = array();
while($row = dbFetchArray($result)) {
list($id, $parentId, $name) = $row;
if ($parentId == 0) {
$categories[$id] = array('name' => $name, 'children' => array());
} else {
$categories[$parentId]['children'][] = array('id' => $id, 'name' => $name);
}
}
$list = '';
foreach ($categories as $key => $value) {
$name = $value['name'];
$children = $value['children'];
$list .= "<option value=\"$key\"";
if ($key == $catId) {
$list.= " selected";
}
$list .= ">$name</option>\r\n";
foreach ($children as $child) {
$list .= "<option value=\"{$child['id']}\"";
if ($child['id'] == $catId) {
$list.= " selected";
}
$list .= "> {$child['name']}</option>\r\n";
}
}
return $list;
}
function createThumbnail($srcFile, $destFile, $width, $quality = 75)
{
$thumbnail = '';
if (file_exists($srcFile) && isset($destFile))
{
$size = getimagesize($srcFile);
$w = number_format($width, 0, ',', '');
$h = number_format(($size[1] / $size[0]) * $width, 0, ',', '');
$thumbnail = copyImage($srcFile, $destFile, $w, $h, $quality);
}
return basename($thumbnail);
}
function copyImage($srcFile, $destFile, $w, $h, $quality = 75)
{
$tmpSrc = pathinfo(strtolower($srcFile));
$tmpDest = pathinfo(strtolower($destFile));
$size = getimagesize($srcFile);
if ($tmpDest['extension'] == "gif" || $tmpDest['extension'] == "jpg")
{
$destFile = substr_replace($destFile, 'jpg', -3);
$dest = imagecreatetruecolor($w, $h);
imageantialias($dest, TRUE);
} elseif ($tmpDest['extension'] == "png") {
$dest = imagecreatetruecolor($w, $h);
imageantialias($dest, TRUE);
} else {
return false;
}
switch($size[2])
{
case 1: //GIF
$src = imagecreatefromgif($srcFile);
break;
case 2: //JPEG
$src = imagecreatefromjpeg($srcFile);
break;
case 3: //PNG
$src = imagecreatefrompng($srcFile);
break;
default:
return false;
break;
}
imagecopyresampled($dest, $src, 0, 0, 0, 0, $w, $h, $size[0], $size[1]);
switch($size[2])
{
case 1:
case 2:
imagejpeg($dest,$destFile, $quality);
break;
case 3:
imagepng($dest,$destFile);
}
return $destFile;
}
function getPagingNav($sql, $pageNum, $rowsPerPage, $queryString = '')
{
$result = mysql_query($sql) or die('Error, query failed. ' . mysql_error());
$row = mysql_fetch_array($result, MYSQL_ASSOC);
$numrows = $row['numrows'];
$maxPage = ceil($numrows/$rowsPerPage);
$self = $_SERVER['PHP_SELF'];
if ($pageNum > 1)
{
$page = $pageNum - 1;
$prev = " <a href=\"$self?page=$page{$queryString}\">[Prev]</a> ";
$first = " <a href=\"$self?page=1{$queryString}\">[First Page]</a> ";
}
else
{
$prev = ' [Prev] ';
$first = ' [First Page] ';
}
if ($pageNum < $maxPage)
{
$page = $pageNum + 1;
$next = " <a href=\"$self?page=$page{$queryString}\">[Next]</a> ";
$last = " <a href=\"$self?page=$maxPage{$queryString}{$queryStr ing}\">[Last Page]</a> ";
}
else
{
$next = ' [Next] ';
$last = ' [Last Page] ';
}
return $first . $prev . " Showing page <strong>$pageNum</strong> of <strong>$maxPage</strong> pages " . $next . $last;
}
?>