PHP分页不起作用

Question

我有以下代码在一个页面上只显示10条记录。当我第一次加载页面时，前10条记录显示良好（见截图） 。但是，当我点击＆＃34;接下来的10条记录＆＃34;时，使用$ _SERVER [＆＃39; PHP_SELF＆＃39;]不会使用额外的GET参数加载相同的URL。 我的地址栏显示了这一点：

http://localhost/PHP/$_SERVER['PHP_SELF']?page=$page

这是我的完整代码;

<?php
$con = @mysqli_connect( "localhost:3306", "root", "P@ssw0rd", "world" ) or die ("Couldn't connect to server");
//get total number of records
$query = "SELECT count(ID) FROM city";
$result = mysqli_query ( $con, $query) or die ("Couldn't execute SELECT query: ". mysqli_error($con));
$rec_count = mysqli_num_rows($result);

$rec_limit = 10; //number of records to display

if( isset($_GET['page']) ){ //when user clicks link
    $page = $_POST['page'] + 1; //page count increment by 1
    $offset = $rec_limit * $page;
}
else{ //user has not yet clicked any link
    $page = 0;
    $offset = 0;
}

//xxxxxxxx  $rec_count is taken from result set
$left_rec = $rec_count - ($page * $rec_limit); //number of records remaining to display

$display_query = "SELECT * FROM city LIMIT $offset, $rec_limit";
$display_result = mysqli_query ( $con, $display_query) or die ("Couldn't execute SELECT query: ". mysqli_error($con));

echo "<table>";
echo "<th>ID</th> <th>Name</th> <th>Country Code</th> <th>District</th> <th>Population</th>";
while( $row = mysqli_fetch_assoc($display_result) ){
    extract($row);
        echo "<tr>
              <td>$ID</td>
              <td>$Name</td>
              <td>$CountryCode</td>
              <td>$District</td>
              <td>$Population</td>
        </tr>";
}
echo "</table>";


if( $page == 0 ){ //user has not yet clicked any link
    echo '<a href="$_SERVER[\'PHP_SELF\']?page=$page"> Next 10 records </a>';
}
else if( $page>0 ){ //user has clicked at least once on link
    $last = $page - 2; //here -2 because, in isset block again increment by 1
    echo '<a href='. $_SERVER['PHP_SELF']. '?page=$last> Last 10 records </a>';
    echo '<a href='. $_SERVER['PHP_SELF']. '?page=$page> Next 10 records </a>';
}
else if( $left_rec < $rec_limit ){ //when only records less than 10 remains
    $last = $page - 2;
    echo '<a href='. $_SERVER['PHP_SELF']. '?page=$last> Last 10 records </a>';
}   

＆GT;

Answer 1

 echo '<a href="'. $_SERVER['PHP_SELF']. '?page='.$page.'"> Next 10 records </a>';

和$ last相似。

Answer 2

if( $page == 0 ){ //user has not yet clicked any link
    echo '<a href="'.$_SERVER['PHP_SELF'].'?page='.$page.'"> Next 10 records </a>';
}

这将修复您的单引号和双引号，并将回显值而不是变量。您必须对所有输入应用相同的逻辑。 你也可以这样做：

if( $page == 0 ){ //user has not yet clicked any link
    echo "<a href=\"{$_SERVER['PHP_SELF']}?page=$page\"> Next 10 records </a>';
}