我正在尝试进行 php 分页，但出现以下错误:
Notice: Undefined variable: Table in C:\wamp64\www\pagination\pagination\function.php on line 10
Fatal error: Call to a member function makeStatement() on null in C:\wamp64\www\pagination\pagination\function.php on line 10
我的代码分为 2 页 - paging.php 和 function.php
分页.PHP
<?php
$dbInfo = "mysql:host=localhost;dbname=paging";
$dbUser = "root";
$dbPassword = "password";
$db = new PDO( $dbInfo, $dbUser, $dbPassword );
$db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
?>
<!DOCTYPE html>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="pagination/css/pagination.css" rel="stylesheet" type="text/css" />
<link href="pagination/css/A_green.css" rel="stylesheet" type="text/css" />
</head>
<body>
<?php
include("pagination/function.php");
$Table = new Table($db);
$page = (int) (!isset($_GET["page"]) ? 1 : $_GET["page"]);
$limit = 5; //if you want to dispaly 10 records per page then you have to change here
$startpoint = ($page * $limit) - $limit;
$statement = "table1 order by name asc"; //you have to pass your query over here
$entrySQL= "select * from {$statement} LIMIT {$startpoint} , {$limit}";
$res = $Table->makeStatement( $entrySQL );
while($row = $res->fetch(PDO::FETCH_ASSOC))
{
echo $row["name"];
echo "<br>";
}
class Table {
//notice protected, not private
public $db;
public function __construct ( $db ) {
$this->db = $db;
}
//notice protected, not private
//$sql argument must be an SQL string
//$data must be an array of dynamic data to use in the SQL
public function makeStatement ( $sql, $data = null ){
$statement = $this->db->prepare( $sql );
try {
$statement->execute( $data );
} catch (Exception $e) {
$exceptionMessage = "<p>You tried to run this sql: $sql <p>
<p>Exception: $e</p>";
trigger_error($exceptionMessage);
}
return $statement;
}
}
?>
<?php
echo "<div id='pagingg' >";
echo pagination($statement,$limit,$page);
echo "</div>";
?>
</body>
</html>
函数.PHP
<?php
function pagination($query, $per_page = 10,$page = 1, $url = '?'){
$query = "SELECT COUNT(*) as `num` FROM $query";
$res = $Table->makeStatement( $query );
$row = $res->fetch(PDO::FETCH_ASSOC);
$total = $row['num'];
$adjacents = "2";
$page = ($page == 0 ? 1 : $page);
$start = ($page - 1) * $per_page;
$prev = $page - 1;
$next = $page + 1;
$lastpage = ceil($total/$per_page);
$lpm1 = $lastpage - 1;
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<ul class='pagination'>";
$pagination .= "<li class='details' style='margin-top:2px'>Page $page of $lastpage</li>";
if ($lastpage < 7 + ($adjacents * 2))
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<li><a class='current'>$counter</a></li>";
else
$pagination.= "<li><a href='{$url}page=$counter'>$counter</a></li>";
}
}
elseif($lastpage > 5 + ($adjacents * 2))
{
if($page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $page)
$pagination.= "<li><a class='current'>$counter</a></li>";
else
$pagination.= "<li><a href='{$url}page=$counter'>$counter</a></li>";
}
$pagination.= "<li class='dot'>...</li>";
$pagination.= "<li><a href='{$url}page=$lpm1'>$lpm1</a></li>";
$pagination.= "<li><a href='{$url}page=$lastpage'>$lastpage</a></li>";
}
elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
{
$pagination.= "<li><a href='{$url}page=1'>1</a></li>";
$pagination.= "<li><a href='{$url}page=2'>2</a></li>";
$pagination.= "<li class='dot'>...</li>";
for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
{
if ($counter == $page)
$pagination.= "<li><a class='current'>$counter</a></li>";
else
$pagination.= "<li><a href='{$url}page=$counter'>$counter</a></li>";
}
$pagination.= "<li class='dot'>..</li>";
$pagination.= "<li><a href='{$url}page=$lpm1'>$lpm1</a></li>";
$pagination.= "<li><a href='{$url}page=$lastpage'>$lastpage</a></li>";
}
else
{
$pagination.= "<li><a href='{$url}page=1'>1</a></li>";
$pagination.= "<li><a href='{$url}page=2'>2</a></li>";
$pagination.= "<li class='dot'>..</li>";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<li><a class='current'>$counter</a></li>";
else
$pagination.= "<li><a href='{$url}page=$counter'>$counter</a></li>";
}
}
}
if ($page < $counter - 1){
$pagination.= "<li><a href='{$url}page=$next'>Next</a></li>";
$pagination.= "<li><a href='{$url}page=$lastpage'>Last</a></li>";
}else{
$pagination.= "<li><a class='current'>Next</a></li>";
$pagination.= "<li><a class='current'>Last</a></li>";
}
$pagination.= "</ul>\n";
}
return $pagination;
}
?>
78
最佳答案
PHP functions have a local variable scope 。因此，pagination 函数内部的 $Table 变量不会引用实例化对象的全局变量 $Table。
相反，您应该在像这样调用函数时将全局变量传递到函数中......
echo pagination($Table, $statement, $limit, $page);
并确保更新您的函数签名，以便它将 Table 对象作为依赖项。
function pagination(Table $Table, $query, $per_page = 10, $page = 1, $url = '?')
关于PHP 分页与 PDO 不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38943227/