PHP implements digital paging function

This article mainly introduces the implementation of digital paging function in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

Learning points:
1.LIMIT usage
2.Various parameters
3.Hyperlink call

First: first set the digital paging module in the file; My file is (blog.php)

The code is as follows:

//分页模块
$_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;

It should be noted that when fetching a set from the database

The code is as follows:

//我们必须每次重新读取结果集，而不是从新去执行SQL语句。
$_result = _query("SELECT tg_username,tg_sex,tg_face FROM tg_user ORDER BY tg_reg_time DESC LIMIT $_pagenum,$_pagesize");

The effect of setting the paging loop

  

  '.($i+1).'';
    }else{
      echo '
'.($i+1).'
';
    }
  } ?>
  

  

The corresponding 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;
}

There may be errors due to encoding. The solution is

// 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;

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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