Digital paging effect of PHP self-study project

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

First: Set up the digital paging module in the file; my file is (blog.php)

<span>//</span><span>分页模块</span><span>$_page</span> = <span>$_GET</span>['page'<span>];
</span><span>$_pagesize</span> = 10<span>;
</span><span>$_pagenum</span> = (<span>$_page</span> - 1) * <span>$_pagesize</span><span>;
</span><span>//</span><span>首页要得到所有的数据总和</span><span>$_num</span>=<span>mysql_num_rows</span>(_query("SELECT tg_id FROM tg_user"<span>));
</span><span>$_pageabsolute</span>=<span>$_num</span> / <span>$_pagesize</span>;

To Note that when fetching a set from the database

// we must re-read the result set every time instead of re-executing the SQL statement.
$_result = _query("SELECT tg_username,tg_sex,tg_face FROM tg_user ORDER BY tg_reg_time DESC LIMIT $_pagenum,$_pagesize");
Set the effect of paging loop

<span><div>
    <ul>
    <?php <span>for</span>(<span>$i</span>=0;<span>$i</span><<span>$_pageabsolute</span>;<span>$i</span>++<span>){
        </span><span>if</span> (<span>$_page</span> == (<span>$i</span>+1<span>)) {
            </span><span>echo</span> '<li><a href="blog.php?page='.(<span>$i</span>+1).'">'.(<span>$i</span>+1).'</a></li>'<span>;
        }</span><span>else</span><span>{
            </span><span>echo</span> '<li><a href="blog.php?page='.(<span>$i</span>+1).'">'.(<span>$i</span>+1).'</li>'<span>;
        }
    } </span>?>
    </ul>
    </div></span>

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

<span><span>//</span><span> 分页模块</span><span>if</span> (<span>isset</span> ( <span>$_GET</span> ['page'<span>] )) {
    </span><span>//</span><span> 在数据不再数据范围内出错的解决方法</span><span>$_page</span> = <span>$_GET</span>['page'<span>];
    </span><span>//</span><span> 是否为空，是否小于0，是否不是数字。//如果其中有一个是，那么就=1</span><span>if</span> (<span>empty</span> ( <span>$_page</span> )||<span>$_page</span> < 0 || !<span>is_numeric</span>( <span>$_page</span><span> )) {
        </span><span>$_page</span> = 1<span>;
    } </span><span>else</span><span> {
        </span><span>$_page</span> = <span>intval</span> ( <span>$_page</span> ); <span>//</span><span> 如果是数字，但是小数，那么就$_page = intval($_page);转换成整数</span><span>    }
} </span><span>else</span><span> {
    </span><span>$_page</span> = 1<span>;
}
</span><span>$_pagesize</span> = 10<span>;
</span><span>$_num</span> = _num_rows( _query ( "SELECT tg_id FROM tg_user"<span> ) );
</span><span>if</span> (<span>$_num</span>==0<span>) {
    </span><span>$_pageabsolute</span>=1<span>;
}</span><span>else</span><span>{
    </span><span>$_pageabsolute</span>=<span>ceil</span>(<span>$_num</span>/<span>$_pagesize</span><span>);
}
</span><span>//</span><span>当页码大于总页码的时候，就会返回到总页码的最后一页</span><span>if</span> (<span>$_page</span>><span>$_pageabsolute</span><span>) {
    </span><span>$_page</span>=<span>$_pageabsolute</span><span>;
}
</span><span>$_pagenum</span> = (<span>$_page</span> - 1) * <span>$_pagesize</span>;</span>

The above introduces the digital paging effect of the PHP self-study project, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.