Heim >Backend-Entwicklung >PHP-Tutorial >Digitaler Paging-Effekt des PHP-Selbststudienprojekts
Lernpunkte:
1. LIMIT-Nutzung
3. Hyperlink-Aufruf
<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>;Es ist zu beachten, dass beim Abrufen eines Satzes aus der Datenbank //wir den Ergebnissatz jedes Mal erneut lesen müssen, Anstatt die SQL-Anweisung von Grund auf auszuführen.
$_result = _query("SELECT tg_username,tg_sex,tg_face FROM tg_user ORDER BY tg_reg_time DESC LIMIT $_pagenum,$_pagesize");Legen Sie den Effekt der Paging-Schleife fest
<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>Das entsprechende 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; }
kann aufgrund der Kodierung Fehler enthalten. Die Lösung ist
<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>Das Obige stellt den digitalen Paging-Effekt des PHP-Selbstlernprojekts vor, einschließlich der relevanten Inhalte. Ich hoffe, dass es für Freunde hilfreich ist, die sich für PHP-Tutorials interessieren.