一个分页读取TXT 文件的阅读程序
主要内容来自网上 ，我做了一些修改 加上了读取数据库的功能。
运行下来这段代码读取大文件的时候速度太慢，现在改进了一下 回头重发一个贴。
<?php
session_start();
header("Content-Type:text/html;charset=utf-8");
include_once("conMySQL.php");
if (empty($page)) {$page=1;}
if (isset($_GET['page'])==TRUE) {$page=$_GET['page']; }
?>
<?php
if($page){
$SQL="select idd,id,lx,mc,dx,rq from book where idd=".$_GET["idd"];
//echo $SQL,"<br>";
$r=mysqli_query($cn,$SQL);
if ($r->num_rows > 0) {
$s=mysqli_fetch_array($r);
$SQL=$s["id"];
//echo $SQL. "<br>";
$filename=substr($SQL,3);
for($i=strlen($filename);$i<10;$i++){
$filename="0".$filename;
}
$filename="txt/". substr($filename,4,3 ). "/". $filename.".txt";
//echo $filename;
$SQL="";
$SQL= $SQL. "<th>书名：".$s["mc"]. " </th>";
$SQL= $SQL. "<td>类型：".$s["lx"]. " 文件大小：".$s["dx"]. "kb ";
$SQL= $SQL. " <a href='download.php?idd=". $_GET["idd"]. "'>下载全本</a>";
$SQL= $SQL. "</td>";
}
$counter=file_get_contents($filename); //读取txt文件内容到$counter
$length=strlen($counter);
$page_count=ceil($length/5000);
function msubstr($str,$start,$len){
$strlength=$start+$len;
$tmpstr="";
for($i=0;$i<$strlength;$i++) {
if(ord(substr($str,$i,1))==0x0a) {
$tmpstr.='<br />';
}
if(ord(substr($str,$i,1))>0xa0) {
$tmpstr.=substr($str,$i,2);
$i++;
}
else{
$tmpstr.=substr($str,$i,1); }
}
$tmpstr=strToUtf8($tmpstr);
return $tmpstr;
}
function strToUtf8($str){
$encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
if($encode == 'UTF-8'){
return $str;
}else{
return mb_convert_encoding($str, 'UTF-8', $encode);
}
}
//------------截取中文字符串---------
$c=msubstr($counter,0,($page-1)*5000);
$c1=msubstr($counter,0,$page*5000);
}?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php echo $s["mc"]; ?></title>
<style type="text/css">
<!--
.STYLE1 {font-size: 12px}
.STYLE2 {font-size: 18px}
-->
</style>
</head>
<body>
<table width="100%" bgcolor="#cccccc">
<tr>
<?php echo $SQL; ?>
</tr>
<tr>
<td width="42%" align="center" valign="middle"><span class="STYLE1"> <?php echo $page;?> / <?php echo $page_count;?> 页 </span></td>
<td width="58%" height="28" align="left" valign="middle">
<span class="STYLE1">
<?php
echo "<a href=disp.php?page=1&idd=".$_GET["idd"].">首页</a> ";
if($page!=1){
echo "<a href=disp.php?page=".($page-1)."&idd=".$_GET["idd"].">上一页</a> ";
}
if($page<$page_count){
echo "<a href=disp.php?page=".($page+1)."&idd=".$_GET["idd"].">下一页</a> ";
}
echo "<a href=disp.php?page=".$page_count."&idd=".$_GET["idd"].">尾页</a> ";
?>
</span> </td>
</tr>
</table>
<table width="100%" bgcolor="#CCCCCC">
<tr>
<td >
<?php
echo substr($c1,strlen($c),strlen($c1)-strlen($c));
?>
</td>
</tr>
</table>
<table width="100%" bgcolor="#cccccc">
<tr>
<td width="42%" align="center" valign="middle"><span class="STYLE1"> <?php echo $page;?> / <?php echo $page_count;?> 页 </span></td>
<td width="58%" height="28" align="left" valign="middle">
<span class="STYLE1">
<?php
echo "<a href=disp.php?page=1&idd=".$_GET["idd"].">首页</a> ";
if($page!=1){
echo "<a href=disp.php?page=".($page-1)."&idd=".$_GET["idd"].">上一页</a> ";
}
if($page<$page_count){
echo "<a href=disp.php?page=".($page+1)."&idd=".$_GET["idd"].">下一页</a> ";
}
echo "<a href=disp.php?page=".$page_count."&idd=".$_GET["idd"].">尾页</a> ";
?>
</span> </td>
</tr>
</table>
</body>
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