PHP网页编程之Text_data 一个PHP文本数据表类

我的这套线路可能跟许多学习PHP的爱好者不谋而合，这也算是一个循序渐进的学习过程，不过新手不要看到上面的概括就以为学习蛮简单的，默默在此不得不对您稍微泼一下冷水，任何东西其实都不简单。数据   <?php
/*
This TextData Class txtTbl writen by ridge.jiang mostone@hotmail.com and finished in 2003.01.01
Your can copy and use it without agreedment,It's free. But you can't use it for busness using.
You are also wellcome to modify this code in your mind. Thank for your work and tell me.
This class is for small information database so like classmater databse,they are less than 300 recorders.
If your want store and opreat more than 300 recorders,It's recommandly to use SQL server.
Your may acess the Instance of this Class with bellow function,there recommandly Do NOT use
inner var and function,because that's unsafe.
create()
drop()
open()
close()
eof()
bof()
prev()
next()
first()
end()
fieldsCount()
getValue()
setValue()
display()
location()
recNO()
recCount()
del()
append()
*/
define ("tblPath",".\\");
define ("exten",".php");
define ("fileHead","<? echo \"You are wellcome!\"?".">This file only for class txtTbl");
class txtTbl {
  var $innerName="";  //数据库称号
  var $innerCount;  //数据库纪录数量
  var $innerFields;  //数据库字段列表数组
  var $inner_F_Count; //数据库字段数量
  var $fullName;  //完全的文件名
  var $isModify = false;  //以后纪录是不是被修正
  var $fileModify = false;  //数据库是不是被修正
  var $innerRecorders;  //数据库纪录数组
  var $curLine;  //以后纪录号
  var $curArray;  //以后行数组
  var $stringDel;  //保留被删除纪录
  var $sprt1;  //数据库纪录间的分隔符
  var $sprt2;  //数据库字段间的分隔符
  var $innerBof = true;
  var $innerEof = false;

  function create($tblName,$fields,$sprt1="<---txtTbl--->\n",$sprt2="<---txtTbl--->"){
if (empty($tblName)){
  echo "The textDateBase file name not appoint.";
  return false;
}
$fullName = tblPath.$tblName.exten;
    if (file_exists($fullName)){
  echo "The textDateBase file is already exist.";
  return false;
}
    if(empty($fields)){
  echo "The fields list Array is invalid.";
  return false;
}
$cont = implode($sprt2,$fields);
$cont = fileHead."\n".$cont;
$fp = fopen($fullName,"w");
    fwrite($fp,$cont);
fclose($fp);
return true;
  }
  function drop($tblName,$sprt1="<---txtTbl--->\n",$sprt2="<---txtTbl--->"){
if (empty($tblName)){
  echo "The textDateBase file name not proveid.";
  return false;
}
if (!empty($this->innerName)){
  echo "Current file not closed,Please close it and try again.";
  return false;
}
$fullName = tblPath.$tblName.exten;
    if (!file_exists($fullName)){
  echo "The textDateBase file not exist.";
  return false;
}
$fp = fopen($fullName,"r");
if (!feof($fp)){
  $readFromFile = fgets($fp);
}
if ($readFromFile!=fileHead."\n"){
  fclose($fp);
  echo "not a valid textDataBase file.(the head is invalid.)"."\n";
  return false;
}
$readFromFile = "";
if (!feof($fp)) $readFromFile.= fgets($fp);
fclose($fp);
$readFromFile = trim($readFromFile);
if (empty($readFromFile)){
  echo "not a valid textDataBase file.(can't find fields define.)";
  return false;
}
$cont = fileHead."\n".$readFromFile;
$fp = fopen($fullName,"w");
fwrite($fp,$cont);
fclose($fp);
return true;
  }
  
  
  function open($tblName,$sprt1="<---txtTbl--->\n",$sprt2="<---txtTbl--->"){
if (empty($tblName)){
  echo "The textDateBase file name not proveid.";
  return false;
}
if (!empty($this->innerName)){
  echo "Current file not closed,Please close it and try again.";
  return false;
}
$this->fullName = tblPath.$tblName.exten;
    if (!file_exists($this->fullName)){
  echo "The textDateBase file not exist.";
  return false;
}
$fp = fopen($this->fullName,"r");
if (!feof($fp)){
  $readFromFile = fgets($fp);
}
if ($readFromFile!=fileHead."\n"){
  fclose($fp);
  echo "not a valid textDataBase file.(the head is invalid.)"."\n";
  return false;
}
$readFromFile = "";
while (!feof($fp)) $readFromFile.= fgets($fp);
fclose($fp);
$readFromFile = trim($readFromFile);
if (empty($readFromFile)){
  echo "not a valid textDataBase file.(can't find fields define.)";
  return false;
}
    $this->innerRecorders = explode($sprt1,$readFromFile);
$this->innerCount = count($this->innerRecorders) - 1;
    $this->innerFields = explode($sprt2,$this->innerRecorders[0]);
    $this->innerFieldsCount = count($this->innerFields);
$this->innerName = $tblName;
$this->sprt1 = $sprt1;
$this->sprt2 = $sprt2;
if ($this->innerCount==0){
  $this->curLine = 0;
  $this->innerEof = true;
}else{
  $this->curLine = 1;
//  if ($this->innerCount==1) $this->innerEof = true;
        if (!$this->initRec()) return false;
}
return true;
  }
  function close(){
if (empty($this->innerName)) return true;
//save modify
$isModify= false;
    if ($this->isModify){
  $this->saveModify();
  $isModify= true;
}
if(isset($this->stringDel)){
  $isModify= true;
  $delNo= explode(",",$this->stringDel);
  foreach($delNo as $no){
   $no= (integer) $no;
   unset($this->innerRecorders[$no]);
  }
}
if ($isModify||$this->fileModify){
  $recorders= implode($this->sprt1,$this->innerRecorders);
  $recorders= fileHead."\n".$recorders;
  $fp = fopen($this->fullName,"w");
  fwrite($fp,$recorders);
  fclose($fp);
}
$this->innerName="";
unset($this->innerRecorders);
unset($this->curArray);
  }
  function next(){
   if ((!$this->innerEof)&&(!empty($this->innerName))){
    if($this->curLine==$this->innerCount){
     $this->innerEof = true;
     return true;
    }
    $this->saveModify();
    $this->curLine++;
    if ($this->innerBof) $this->innerBof = false;
    $this->initRec();
   }
   return false;
  }
  
  function prev(){
   if ((!$this->innerBof)&&(!empty($this->innerName))){
    $this->saveModify();
    $this->curLine--;
    if ($this->curLine == 1)
     $this->innerBof = true;
    if ($this->innerEof) $this->innerEof = false;
    $this->initRec();
   }
  }
  function first(){
    if ($this->innerBof||empty($this->innerName))
  return false;
    $this->saveModify();
$this->curLine = 1;
$this->innerBof= true;
$this->innerEof = false;
$this->initRec();

  }
  
  function end(){
    if ($this->innerEof||empty($this->innerName))
  return false;
    $this->saveModify();
$this->curLine = $this->innerCount;
$this->innerEof= true;
$this->innerBof = false;
$this->initRec();

  }

  function eof(){
   if (empty($this->innerName)){
    return false;
   }else return $this->innerEof;
  }
  function bof(){
   if (empty($this->innerName)){
    return true;
   }else return $this->innerBof;
  }
  function recNo(){
   return $this->curLine;
  }
  function recCount(){
   return $this->innerCount;
  }
  function fieldsCount(){
   if (empty($this->innerName)){
    return false;
   }else return $this->inner_F_Count;
  }
  function getValue($field){
if ($this->curLine==0||empty($this->innerName)){
  echo "Can't read current record,maybe not in use or no record.";
  return false;
}
$field= $this->chkField($field);
    if ($field==-1){
  return false;
}
return $this->curArray[$field];
  }

  function setValue($field,$value){
    if ($this->curLine==0||empty($this->innerName)){
  echo "Can't read current record,maybe not in use or no record.";
  return false;
}
$field= $this->chkField($field);
if ($field==-1){
  return false;
}
$this->curArray[$field]= $value;
$this->modify= true;
  }
  
  function display($shownon=0,$sprt1="<td>",$sprt2="</td>",$sprt3="<tr>",$sprt4="</tr>"){
echo $sprt3;
foreach($this->curArray as $v){
  if($shownon==1&&empty($v)) $v= "noValue";
  echo $sprt1.$v.$sprt2;
}
echo $sprt4;
  }
  function location($field,$keyValue){
    $field=$this->chkField($field);
if ($field==-1) return false;
for($i=$this->curLine;$i<=$this->innerCount;$i++){
  if($this->curArray[$field]==$keyValue){
   return true;
  }
  $this->next();
}
return false;
  }
  
  function del($recNo=-1){
if($this->curLine==0) return false;
$vartype= gettype($recNo);
if($vartype!="integer"){
  echo "del error:check ur para type.";
  return false;
}
    if ($recNo==-1){
  $recNo=$this->curLine;}
elseif ($recNo>$this->innerCount||$recNo<1){
  echo "del error:out over the rang.";
  return false;
}
if (!$this->chkDel($recNo)){
  if(isset($this->stringDel)){
   $this->stringDel.=(','.$recNo);
  }else $this->stringDel = (string) $recNo;
}else return false;
  }
   
  function append($fields=""){
$this->saveModify();
for($i=1;$i<=$this->innerFieldsCount;$i++)
  $newRec[] = "";
    if(!empty($fields)){
  foreach($fields as $k=>$v){
   $k= $this->chkField($k);
   if ($k==-1){
    return false;
   }
            $newRec[$k]= $v;
  }
}
$this->innerCount++;
$this->curLine = $this->innerCount;
$this->innerBof = false;
$this->innerEof = true;
unset($this->curArray);
$this->curArray = &$newRec;
$this->isModify = true;
  }


//保留修正
function saveModify(){
  if($this->isModify){
   $this->innerRecorders[$this->curLine]= implode($this->sprt2,$this->curArray);
   $this->isModify = false;
   $this->fileModify= true;
  }
}
//当指针产生变更时，初始化以后纪录数组
function initRec(){
  $this->curArray = explode($this->sprt2,$this->innerRecorders[$this->curLine]);
  if (count($this->curArray)!=$this->innerFieldsCount){
   echo "The Current Recorder fields count unequal to Table's.\n File will close.";
   $this->close();
   return false;
  }
  return true;
}

//输入以后纪录信息，设计为调试用
function ddisplay(){
  if ($this->innerCount==0) return false;
  foreach($this->innerFields as $v) echo $v."----";
  echo "<br>";
  foreach($this->curArray as $v) echo $v."---";
}
//反省纪录是不是已被删除
function chkDel($key){
  if (empty($key)&&$key!=0){
   echo "the key not appoint.";
   return false;
  }
  if (!isset($this->stringDel)){
   return false;
  }
  if (ereg("(^|,)".$key."(,|$)",$this->stringDel)){
   return true;
  }
  return false;
}
//反省提交的字段名是不是正当.
function chkField($field){
  if (empty($field)&&($field!=0)){
   echo "the field not appoint.";
   return -1;
  }
  $vartype = gettype($field);
  switch ($vartype) {
   case "integer":
    if ($field>=$this->innerFieldsCount){
        echo "the field is large than fieldscount";
        return -1;
    }elseif($field<0){
     echo "the field is less than 0";
     return -1;
    }
    return $field;
  case "string":
   foreach ($this->innerFields as $k=>$v) if ($field==$v) return $k;
   echo "the field name not found.";
   return -1;
  default:
   echo "the field is invalid.";
   return -1;
  }
}
}
?>


PHP于1994年由Rasmus Lerdorf创建，刚刚开始是Rasmus Lerdorf为了要维护个人网页而制作的一个简单的用Perl语言编写的程序。