学习php所遇到的问题?

你引用的到才怪呢？
init()是class 里的，怎么引用外面的变量
发个我现在在用的数据库类你吧，
不管理怎么说，这个类也经历了八年多的历史了，应该很稳定吧<?
/**
* 数据库类．
*
* 封装常见的数据库操作，包括分页处理．
*
* @author  徐兴
* @package lib
* @version v1.0
* @copyright juwangTech.
*
*/class db {

/**
* 可以选择mysql oracle sql
* @access  public
* @var   数据库类型
*/
public $dbtype='mysql';

/**
* 默认的数据库连接所用的用户名．
* @access  public
* @var   数据库用户名
*/
public $user='';

/**
* 默认的数据库连接所用的用户密码
* @access  public
* @var   数据库密码
*/
public $pass='';
/**
* 数据库主机地址,本机默认写localhost
* @access  public
* @var   数据库主机地址
*/
public $host='';    /**
* 指定的不当前操作的数据库
* @access  public
* @var   数据库，指定的库
*/
public $database='';   /**
* 数据库的连接句柄
* @access  public
* @var   句柄
*/
public $handle;

/**
* 记录集
* @access  public
* @var   记录集
*/
public $rs = array();

/**
* 最后一次记录集
* @access  public
* @var   最后一次记录集
*/
public $last_rs = '';

/**
* 分页记录中一页数据的行数
* @access  public
* @var   分页记录中一页数据的行数
*/

public $rows_num=0;        //记录行数
public $page=0;            //页
public $pages_num=0;       //页数
public $rows_per_page=0;   //每页记录行数
public $rows_offset=0;     //行偏移,使用较少
public $params='';          //参数
public $show_page_num=0;   //页式2时示页(为)
public $func_ary = array(
'farray'       => 'mysql_fetch_array',
'fnum'         => 'mysql_fetch_row',
'ffield'       => 'mysql_fetch_assoc',
'fobject'      => 'mysql_fetch_object',
);
/**
* 指定数据库类型，是mysql 还是sql,还是orecle.
* @param 数据库的类型 $type
* @return bool
*/
function __construct( $type='mysql' ) {
if( $type!='' ) $this->dbtype = $type;
if( !$this->func_ary[$this->dbtype] ) {
return false;
}else {
return true;
}
}
/**
* *创建一个数据库的连接.
*
* @param string $host -主机名称
* @param string $user -数据库用户名
* @param 数据库用户密码 $pass
* @return 数据库句柄.handle
*/

function conn( $host = 'localhost' , $user = 'longsmartcn' , $pass = '57202240' ) {
if( gettype( $host ) == 'resource' ) {
$this->handle = $host;
}else {
if( $host != '' ) $this->host = $host;
if( $user != '')  $this->user = $user;
if( $pass != '')  $this->pass = $pass;
$this->handle = mysql_connect( $this->host , $this->user , $this->pass , false , MYSQL_CLIENT_COMPRESS ) or die( "系统忙，请稍厚" );
// $this->query( "SET NAMES utf8") or die( "set names utf-8 失败" );
return $this->handle;
}
} /**
* *关闭数据库连接.
*
*/
function close() {
@mysql_close($this->handle);
} /**
* *指定所选的数据库.
*
* @param 指定的当前操作的数据库名. $database
*/
function setdb( $database = 'pm' ) {
if( $database != '' ) $this->database = $database;
@mysql_select_db( $this->database , $this->handle );
} /**
* 执行一个sql语句．
* @param 查询语句，支持单个sql和数组模式.。 $sql
* @return
    */
function query( $sql ) {
if( is_array( $sql ) ) {

for($i=0; $i<sizeof($sql); $i++) {
$tmp = @mysql_query($sql[$i],$this->handle);
}
return $tmp;
}else {
return @mysql_query($sql,$this->handle);
}
} /**
* 取出最新插入数据库的id号.
* @return  int
*/
function insid() {
return @mysql_insert_id($this->handle);
} /**
* 获取影响的行数.
*/
function affrow() {
return @mysql_affected_rows($this->handle);
} /*  */
function err() {
return array(@mysql_errno(), @mysql_error($this->handle));
} /* 已记录集方式得到记录本 */
function rs( $sql = '' , $rs_name = '' ) {
if( $rs_name == '' && $this->last_rs == '') {
$rs_name='rs';
}elseif( $rs_name == '' ) {
$rs_name = $this->last_rs;
}
$sql_tmp = is_array( $sql )? $sql [ sizeof( $sql ) ] : $sql;
if( $sql_tmp != '' && $this->result[ $rs_name ][ 0 ] != $sql ){
$tmp = $this->query( $sql );
$this->result[ $rs_name ] = array( $sql_tmp,$tmp );
$this->last_rs = $rs_name;
}
return $this->result[ $rs_name ][1];
} /* 以数组方式取得 */
function rn( $sql='' , $type = 'num' , $rs_name = '',$num = 1) {
if( !$type ) $type = 'num';
if( !in_array( $type , array( 'num' , 'field' , 'array' , 'object' ))) return false;
      if( $num == 1 ) {
return @$this->func_ary[ 'f'. $type ]( $this->rs( $sql , $rs_name));
}elseif( $num == 'all' ) {
while( $tmp[] = @$this->func_ary[ 'f'.$type ]( $this->rs( $sql , $rs_name ))) {
}
}elseif( is_int( $num )) {
for( $i = 0 ;  $i < $num ; $i++ ) {
$tmp1 = @$this->func_ary[ 'f'.$type ]( $this->rs( $sql , $rs_name ) );
if( $tmp1 === false ) {
break;
}else {
$tmp[] = $tmp1;
}
}
}else {
return false;
}
return $tmp;
} /**
*  得到单值
*/
function val( $sql ) {
if( DEBUG == "1" ){echo $sql."<hr/>";}

$tmp = mysql_fetch_row($this->query($sql));
if( is_null($tmp)) {
echo "没有你要取得值";
}
return $tmp[0];
}

/**
*  得到单值 ,多个的
* @param  查询语句 $sql
*/
function vals( $sql ) {
if( DEBUG == "1" ){echo $sql."<hr/>";}

$tmp = mysql_fetch_row($this->query($sql));
if( is_null($tmp)) {
echo "没有你要取得值";
}
return $tmp;
}

/**
* 通过表中的一个字段的值来取得另个字段，或者是一组数据的方法．
* @param  值的编号．　$id
* @param  需要取得的数据的字段名．　$attrName
* */
function getValue($id,$attrName,$table,$condKey)
{
$table = $table;
$cond = "where $condKey = '$id'";
$sql = "select $attrName from $table $cond";

    if(DEBUG == "1")
{
echo "getValue".$sql."<hr/>";
}

if (strpos($attrName, ',')) {
$value = $this->vals( $sql );
} else {
$value = $this->val( $sql );
}

if(DEBUG == "1")
{
echo "你所求的值为 " . var_dump( $value ) . "    |";
}
return $value;
}

/**
*  得到行数
*/
function num($sql='',$rs_name='rs') {
return @mysql_num_rows($this->rs($sql,$rs_name));
}
/**
*  清空记录集
*/
function clean($rs_name) {
if(is_array($rs_name)) {
foreach($rs_name as $val) {
@mysql_free_result($this->result[$rs_name][1]);
unset($this->result[$val]);
}
}else {
@mysql_free_result($this->result[$rs_name][1]);
unset($this->result[$rs_name]);
}
}
/**
*  重设记录集
*/
function reset ($rs_name) {
if(is_array($rs_name)) {
foreach($rs_name as $val) {
@mysql_data_seek($this->result[$val][1],0);
}
}else {
@mysql_data_seek($this->result[$rs_name][1],0);
}
}
接上
/**
*  指定分页
*/
function pnum($page,$rows_num,$rows_per_page=20,$offset=0) {
if($rows_num)      $this->rows_num      = $rows_num;
if($rows_per_page) $this->rows_per_page = $rows_per_page;
if($offset)        $this->offset        = $offset;
if(!$page)         $page =1;
$this->page = $page;
$this->pages_num = ceil(($this->rows_num-$this->offset)/$this->rows_per_page);
Return $this->pages_num;
} /* 进行分页处理 */
function page($sql,$rs_name='') {
switch($this->dbtype) {
case 'mysql':
$sql = $sql." limit ".(($this->page-1)*$this->rows_per_page+$this->offset).", ".$this->rows_per_page;

return $this->rs($sql,$rs_name);
break;
}
} /**
* * 输出分页条.
*
* @param 分页的格式类型 $style
* @param 显示多少个分页标签. $show_page_num
*/
function nav(  $style='nav1',  $show_page_num=15 ) {
switch( $style ) {

case 'nav2':
for( $i=1 ; $i <= $this->pages_num; $i++ ) {
if( $i == $this->page ) {
$nav .= " <font style='font-size:12pt' face='Verdana'><b> $i </b></font> ";
}else {
$nav .= " <a href=?page=$i&". $this->params ."><font style='font-size:9pt;' face='Verdana'>$i</font></a> ";
}
}
$nav = " $nav 页";
break;
case 'nav3':
echo "
<style>
.page, .page_select
{
width:25px;
text-decoration: none;
text-align: center;
border: 1px solid #092FB3;
font-size:9pt;
float:left;
line-height:25px;
margin-right:2px;
}
.page{
color:#092FB3;
background-color: #EEF8FF;
display:block;
}
.page_select
{
color:#EEF8FF;
background-color: #092FB3;
font-weight: bolder;
}
.a_nav
{
color:#092FB3;
text-decoration: none;
text-align: center;
font-size:9pt;
line-height:25px;
float:left;
}
</style>
";
if($show_page_num) $this->show_page_num = $show_page_num;
$page          = $this->page;
$show_page_num = $this->show_page_num;
$pages_num     = $this->pages_num;
$param         = $this->params;
$mid = ceil(($show_page_num+1)/2);
$nav = '';
if($page<=$mid ) {
$begin = 1;
}else if($page > $pages_num-$mid) {
$begin = $pages_num-$show_page_num+1;
}else {
$begin = $page-$mid+1;
}

/**
* patch for param;　保留原有的查询条件．
* */
$param = $_SERVER["QUERY_STRING"];
$pattern = "/&page=(\d)/i";
$replacement = "";
$param =  preg_replace($pattern, $replacement, $param);

if($begin<0) $begin = 1;
if($begin!=1) $nav .= " <a href='?$param&page=1' title='1页' class ='a_nav'><< 首页</a>  ";
if($page>1)   $nav .= " <a href='?$param&page=".($page-1)."' title='".($page-1)."页' class ='a_nav'><<上一页</a> ";
$end = ($begin+$show_page_num>$pages_num)?$pages_num+1:$begin+$show_page_num;
for($i=$begin; $i<$end; $i++) {
$nav .=($page!=$i)?" <a href='?$param&page=$i' class = 'page'  title='{$i}页'>$i</a> ":" <span  class = 'page_select'>$i</span> ";
}
if($page<$pages_num)   $nav .= " <a href='?$param&page=".($page+1)."' title='".($page+1)."页' class ='a_nav'>下一页 >></a> ";
if($end!=$pages_num+1) $nav .= "  <a href='?$param&page=$pages_num' title='{$pages_num}页' class ='a_nav'>尾页 >></a> ";
break;

//91061 2008版分页.
case 'nav5' :
if($show_page_num) $this->show_page_num = $show_page_num;
$page          = $this->page;
$show_page_num = $this->show_page_num;
$pages_num     = $this->pages_num;
$param         = $this->params;
$mid = ceil(($show_page_num+1)/2);
$nav = '';
if($page<=$mid ) {
$begin = 1;
}else if($page > $pages_num-$mid) {
$begin = $pages_num-$show_page_num+1;
}else {
$begin = $page-$mid+1;
}

/**
* patch for param;　保留原有的查询条件．
* */
$param = $_SERVER["QUERY_STRING"];
$pattern = "/&page=(\d)/i";
$replacement = "";
$param =  preg_replace($pattern, $replacement, $param);

if($begin<0) $begin = 1;
if($begin!=1) $nav .= "<li><a class='page_flip1' title='到首页' href='?$param&page=1'>首页</a></li>";

//<li><a class="page_flip2" title="上一页" href="#">上一页</a></li>

if($page>1)   $nav .= "<li> <a href='?$param&page=".($page-1)."' title='".($page-1)."页' class='page_pre'></a> </li>";
$end = ($begin+$show_page_num>$pages_num)?$pages_num+1:$begin+$show_page_num;
for($i=$begin; $i<$end; $i++) {
$nav .=($page!=$i)?"<li><a href='?$param&page=$i' class = 'page_num'  title='{$i}页'>$i</a></li>":"<li><a href='?$param&page=$i' class = 'page_sele'  title='{$i}页'>$i</a></li>";
}
if($page<$pages_num)   $nav .= "<li> <a href='?$param&page=".($page+1)."' title='".($page+1)."页' class ='page_next'></a> </li> ";
if($end!=$pages_num+1) $nav .= "<li>  <a href='?$param&page=$pages_num' title='{$pages_num}页' class ='page_flip1'>尾页 >></a> </li>  ";

break;

/*直转 */
case 'listjump':
$nav = '
<select onchange="location.href=\'?'.$this->params.'&page=\'+this.value;">
<script language="JavaScript">

</script>
</select> 页';
break;
case 'inputjump':
return "<script language='javascript'>function pagejump(){if (document.all.pagejmp.value == ''|| document.all.pagejmp.value < 0 ) {document.all.pagejmp.focus();alert('转页搿?;return false;}else{this.location.href = '?page='+document.all.pagejmp.value+'&".$this->params."'; target = '_self';}}</script> 转 <input name=pagejmp size=2 onkeydown='if(window.event.keyCode==13) pagejump();'> 页 <img src=".gd('user')."images/go1.gif align=absmiddle onclick='pagejump();' style='cursor:hand;'>";
break;
case 'imagejump':
return "<script language='javascript'>function pagejump(){if (document.all.pagejmp.value == ''|| document.all.pagejmp.value < 0 ) {document.all.pagejmp.focus();alert('转页搿?;return false;}else{this.location.href = '?page='+document.all.pagejmp.value+'&".$this->params."'; target = '_self';}}</script> 转 <input name=pagejmp size=4 onkeydown='if(window.event.keyCode==13) pagejump();' style='border:1px solid #424242; height:16px;'> 页 <img src=".gd('magzine')."images/go.gif align=absmiddle onclick='pagejump();' style='cursor:hand;' width=25 height=17>";
break;
default:
$nav = '';
}
return $nav;
}
}
/**
*   数据库初始化问题。
*/
function db_init() {
global $db;
$db = new db();
$db->conn();
$db->setdb("longsmartcn");
}?>

调试易

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