PHP paging function sample code_PHP tutorial

Code, php paging function.

<?<span php
</span><span /*</span><span 
* Created on 2011-07-28
* Author : LKK , http://lianq.net
* 使用方法：
require_once('mypage.php');
$result=mysql_query("select * from mytable", $myconn);
$total=mysql_num_rows($result);    //取得信息总数
pageDivide($total,10);     //调用分页函数

//数据库操作
$result=mysql_query("select * from mytable limit $sqlfirst,$shownu", $myconn);
while($row=mysql_fetch_array($result)){
...您的操作
}
echo $pagecon;    //输出分页导航内容
</span><span */</span>

<span if</span>(!<span function_exists</span>("pageDivide"<span )){
</span><span #</span><span $total     信息总数</span><span 
#</span><span $shownu    显示数量,默认20</span><span 
#</span><span $url     本页链接</span>
<span function</span> pageDivide(<span $total</span>,<span $shownu</span>=20,<span $url</span>=''<span ){

</span><span #</span><span $page 当前页码</span><span 
#</span><span $sqlfirst mysql数据库起始项</span><span 
#</span><span $pagecon    分页导航内容</span>
<span global</span> <span $page</span>,<span $sqlfirst</span>,<span $pagecon</span>,<span $_SERVER</span><span ;
</span><span $GLOBALS</span>["shownu"]=<span $shownu</span><span ;

</span><span if</span>(<span isset</span>(<span $_GET</span>['page'<span ])){
</span><span $page</span>=<span $_GET</span>['page'<span ];
}</span><span else</span> <span $page</span>=1<span ;

</span><span #</span><span 如果$url使用默认,即空值,则赋值为本页URL</span>
<span if</span>(!<span $url</span>){ <span $url</span>=<span $_SERVER</span>["REQUEST_URI"<span ];}

</span><span #</span><span URL分析</span>
<span $parse_url</span>=<span parse_url</span>(<span $url</span><span );
@</span><span $url_query</span>=<span $parse_url</span>["query"];    <span //</span><span 取出在问号?之后内容</span>
<span if</span>(<span $url_query</span><span ){
</span><span $url_query</span>=<span preg_replace</span>("/(&?)(page=<span $page</span>)/","",<span $url_query</span><span );
</span><span $url</span> = <span str_replace</span>(<span $parse_url</span>["query"],<span $url_query</span>,<span $url</span><span );
</span><span if</span>(<span $url_query</span><span ){
</span><span $url</span> .= "&page"<span ;
}</span><span else</span> <span $url</span> .= "page"<span ;
}</span><span else</span> <span $url</span> .= "?page"<span ;

</span><span #</span><span 页码计算</span>
<span $lastpg</span>=<span ceil</span>(<span $total</span>/<span $shownu</span>);    <span //</span><span 最后页,总页数</span>
<span $page</span>=<span min</span>(<span $lastpg</span>,<span $page</span><span );
</span><span $prepg</span>=<span $page</span>-1; <span //</span><span 上一页</span>
<span $nextpg</span>=(<span $page</span>==<span $lastpg</span> ? 0 : <span $page</span>+1); <span //</span><span 下一页</span>
<span $sqlfirst</span>=(<span $page</span>-1)*<span $shownu</span><span ;

</span><span #</span><span 开始分页导航内容</span>
<span $pagecon</span> = "显示第 ".(<span $total</span>?(<span $sqlfirst</span>+1):0)."-".<span min</span>(<span $sqlfirst</span>+<span $shownu</span>,<span $total</span>)." 条记录，共 <B><span $total</span></B> 条记录"<span ;
</span><span if</span>(<span $lastpg</span><=1) <span return</span> <span false</span>;    <span //</span><span 如果只有一页则跳出</span>

<span if</span>(<span $page</span>!=1) <span $pagecon</span> .=" <a href='<span $url</span>=1'>首页</a> "; <span else</span> <span $pagecon</span> .=" 首页 "<span ;
</span><span if</span>(<span $prepg</span>) <span $pagecon</span> .=" <a href='<span $url</span>=<span $prepg</span>'>前页</a> "; <span else</span> <span $pagecon</span> .=" 前页 "<span ;
</span><span if</span>(<span $nextpg</span>) <span $pagecon</span> .=" <a href='<span $url</span>=<span $nextpg</span>'>后页</a> "; <span else</span> <span $pagecon</span> .=" 后页 "<span ;
</span><span if</span>(<span $page</span>!=<span $lastpg</span>) <span $pagecon</span>.=" <a href='<span $url</span>=<span $lastpg</span>'>尾页</a> "; <span else</span> <span $pagecon</span> .=" 尾页 "<span ;

</span><span #</span><span 下拉跳转列表,循环列出所有页码</span>
<span $pagecon</span> .="　到第 <select name='topage' size='1' onchange='window.location=\"<span $url</span>=\"+this.value'>\n"<span ;
</span><span for</span>(<span $i</span>=1;<span $i</span><=<span $lastpg</span>;<span $i</span>++<span ){
</span><span if</span>(<span $i</span>==<span $page</span>) <span $pagecon</span> .="<option value='<span $i</span>' selected><span $i</span></option>\n"<span ;
</span><span else</span> <span $pagecon</span> .="<option value='<span $i</span>'><span $i</span></option>\n"<span ;
}
</span><span $pagecon</span> .="</select> 页，共 <span $lastpg</span> 页"<span ;

}
}</span><span else</span> <span die</span>('pageDivide()同名函数已经存在!'<span );
</span>?>

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