PHP自练项目之数字分页效果-tutoriel php-php.cn

PHP自练项目之数字分页效果

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Libérer： 2016-08-08 09:20:02

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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）

<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>;

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要注意的是在数据库中取集的时候

//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");
设置分页循环的效果

<span><div>
    <ul>
    <?php <span>for(<span>$i</span>=0;<span>$i</span>$_pageabsolute;<span>$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>%24i</span>+1).'">'.(<span>$i</span>+1).'</a></li>'<span>;
        }</span><span>else</span><span>{
            </span><span>echo</span> '<li><a href="blog.php?page='.(<span>%24i</span>+1).'">'.(<span>$i</span>+1).'</a></li>'<span>;
        }
    } </span>?>
    </ul>
    </div></span>

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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;
}

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在其中可能会由于编码出现容错误，解决的方法是

<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>$_page</span> is_numeric</span>( <span>$_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>;

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以上就介绍了PHP自练项目之数字分页效果，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。