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Homephp教程php手册PHP爱好者来看:几个有用的函数

文件读取函式

   //文件读取函式
   function PHP_Read($file_name) {
   $fd=fopen($file_name,r);
   while($bufline=fgets($fd, 4096)){
   $buf.=$bufline;
    }
   fclose($fd);
   return $buf;
    }
   ?>

文件写入函式

    //文件写入函式
   function PHP_Write($file_name,$data,$method="w") {
   $filenum=@fopen($file_name,$method);
   flock($filenum,LOCK_EX);
   $file_data=fwrite($filenum,$data);
   fclose($filenum);
   return $file_data;
    }
   ?>

静态页面生成函式

   //静态页面生成函式
   function phptohtm($filefrom,$fileto,$u2u=1){
   if($u2u==1){
   $data=PHP_Read($filefrom);
    }else{
   $data=$filefrom;
    }
   PHP_Write($fileto,$data);
   return true;
    }
   ?>

指定条件信息数量检索函式

    //指定条件信息数量检索函式
   function rec_exist($table,$where){
   $query="select count(*) as num from $table ".$where;
   $result=mysql_query($query) or die(nerror(1));
   $rowcount=mysql_fetch_array($result);
   $num=$rowcount["num"];
   if ($num==0){
   return false;
    }
   return $num;
    }
   ?>

目录删除函式

   //目录删除函式
   function del_DIR($directory){
   $mydir=dir($directory);
   while($file=$mydir->read()){
   if((is_dir("$directory/$file")) AND ($file!=".") AND ($file!="..")){
   del_DIR("$directory/$file");
    }else{
   if(($file!=".") AND ($file!="..")){
   unlink("$directory/$file");
   //echo "unlink $directory/$file ok ";
    }
    }
    }
   $mydir->close();
   rmdir($directory);
   //echo "rmdir $directory ok ";
    }
   ?>

目录名称合法性检测函式

   //目录名称合法性检测
   function isen($str){
   $ret="";
   for($i=0;$i   $p=ord(substr($str,$i,1));
   if(($p57 & $p90 & $p122){
   nerror("不符合规范!");
    }
   $ret.=chr($p);
    }
   return $ret;
    }
   ?>

分页函式

   //分页函式
   function splitlist($HALT,$LRLIST,$ECHOCNT,$paper,$table,$where,$page_id,$userid){
   global $splitstr,$sumcnt;
   if($paper=="" || $sumcnt==""){
   $query = "select count(*) as num from $table $where";
   $result = mysql_query($query);
   $row = mysql_fetch_array($result);
   $sumcnt=$row["num"];
   if($sumcnt==0){
   nerror("该版内还没有选择发布新闻 !");
    }
   $paper=1;
    }
   $sumpaper=($sumcnt-$sumcnt%$ECHOCNT)/$ECHOCNT;
   if(($sumcnt%$ECHOCNT)!=0) $sumpaper+=1;
   if($sumpaper==1 && $HALT==0) return($where);
   $enwhere=base64_encode(base64_encode($where));
   if(($LRLIST*2+1)    if(($paper-$LRLIST)    $tract=1;
   $sub=$LRLIST*2+1;
    }else if(($paper+$LRLIST) >= $sumpaper){
   $tract=$sumpaper-($LRLIST*2);
   $sub=$sumpaper;
    }else{
   $tract=$paper-$LRLIST;
   $sub=$paper+$LRLIST;
    }
    }else{
   $tract=1;
   $sub=$sumpaper;
    }
   $uppaper=$paper-1;
   $downpaper=$paper+1;
   $startcnt=($paper-1)*$ECHOCNT;
   $where.=" limit ${ startcnt },${ ECHOCNT }";
   if($tract > 1) { $splitstr="【    else $splitstr="【    for($i=$tract;$i   if ($i!=$paper) $splitstr.="".$i." ";
   else $splitstr.="".$i." ";
    }
   if ($sub!=$sumpaper) $splitstr.=">> 】";
   else $splitstr.=">> 】";
   return($where);
    }
   ?>

关于分页函式的使用说明 

/*#### 检索分页函式 ####
   Int $HALT - 检索结果仅分1页时是否(1/0)显示页码条
   Int $LRLIST - (页码条显示页码数-1)/2
   Int $ECHOCNT - 检索时每页显示记录的数量
   Int $paper - 页数,预提取:$paper=$HTTP_GET_VARS[paper];
   Varchar $table - 数据表名,预附值:$table="db.table";
   Varchar $where - 检索条件,预附值:$where="where field=@#value@#";
   Varchar $enwhere - 将原$where进行两次base64_encode()编码后以GET的方式提交
   Varchar $splitstr - 页码条输出字串,执行函式后在相应的位置执行 echo $splitstr;
   函式调用前需获取变量 -
   $paper=$HTTP_GET_VARS[paper];
   $sumcnt=$HTTP_GET_VARS[sumcnt];
   $enwhere=$HTTP_GET_VARS[enwhere];
   Return (Varchar $where) - 分页后检索语句的检索条件
   注意:本函式需调用出错处理函式 nerror($error);
   */
   ?>

图片文件上传函式

   //图片文件上传函式
   function upload_img($UploadFile,$UploadFile_name,$UploadFile_size,$UploadPath,$max_size=64){
   //$TimeLimit=60; //设置超时限制时间 缺省时间为 30秒 设置为0时为不限时
   //set_time_limit($TimeLimit);
   if(($UploadFile!= "none" )&&($UploadFile != "" )){
   $FileName=$UploadPath.$UploadFile_name;
   if($UploadFile_size    $FileSize="(string)$UploadFile_size" . "字节";
    }elseif($UploadFile_size    $FileSize=number_format((double)($UploadFile_size / 1024), 1) . " KB";
    }else{
   nerror("文件超过限制大小!");
    }
   //{
   //$FileSize="number_format((double)($UploadFile_size" / (1024 * 1024)), 1) . " MB";
   // }
   if(!file_exists($FileName)){
   if(copy($UploadFile,$FileName)){
   return "$UploadFile_name ($FileSize)";
    }else{
   nerror("文件 $UploadFile_name 上载失败!");
    }
   unlink($UploadFile);
    }else{
   nerror("文件 $UploadFile_name 已经存在!");
    }
   //set_time_limit(30); //恢复缺省超时设置
    }
    }
   ?>



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