学习要点:
1.LIMIT 用法
2.各种参数
3.超链接调用
第一:先在文件中设置数字分页模块;我的文件是(blog.php)
$_page = $_GET['page'];
$_pagesize = 10;
$_pagenum = ($_page - 1) * $_pagesize;
//首页要得到所有的数据总和
$_num=mysql_num_rows(_query("SELECT tg_id FROM tg_user"));
$_pageabsolute=$_num / $_pagesize;
要注意的是在数据库中取集的时候
$_result = _query("SELECT tg_username,tg_sex,tg_face FROM tg_user ORDER BY tg_reg_time DESC LIMIT $_pagenum,$_pagesize");
设置分页循环的效果
<div id="page_num"> <ul> <?php for($i=0;$i<$_pageabsolute;$i++){ if ($_page == ($i+1)) { echo '<li><a href="blog.php?page='.($i+1).'" class="selected">'.($i+1).'</a></li>'; }else{ echo '<li><a href="blog.php?page='.($i+1).'">'.($i+1).'</li>'; } } ?> </ul> </div>
相对应的CSS
#page_num { height:20px; clear:both; padding:10px 0; position:relative; } #page_num ul { position:absolute; right:30px; height:20px; } #page_num ul li { float:left; width:26px; height:20px; } #page_num ul li a { display:block; width:20px; height:20px; line-height:20px; border:1px solid #333; text-align:center; text-decoration:none; } #page_num ul li a:hover,#page_num ul li a.selected { background:#666; font-weight:bold; color:#fff; }
在其中可能会由于编码出现容错误,解决的方法是
// 分页模块 if (isset ( $_GET ['page'] )) { // 在数据不再数据范围内出错的解决方法 $_page = $_GET['page']; // 是否为空,是否小于0,是否不是数字。//如果其中有一个是,那么就=1 if (empty ( $_page )||$_page < 0 || !is_numeric( $_page )) { $_page = 1; } else { $_page = intval ( $_page ); // 如果是数字,但是小数,那么就$_page = intval($_page);转换成整数 } } else { $_page = 1; } $_pagesize = 10; $_num = _num_rows( _query ( "SELECT tg_id FROM tg_user" ) ); if ($_num==0) { $_pageabsolute=1; }else{ $_pageabsolute=ceil($_num/$_pagesize); } //当页码大于总页码的时候,就会返回到总页码的最后一页 if ($_page>$_pageabsolute) { $_page=$_pageabsolute; } $_pagenum = ($_page - 1) * $_pagesize;

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The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.

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PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.

In JavaScript, you can use NullCoalescingOperator(??) and NullCoalescingAssignmentOperator(??=). 1.??Returns the first non-null or non-undefined operand. 2.??= Assign the variable to the value of the right operand, but only if the variable is null or undefined. These operators simplify code logic, improve readability and performance.


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