PHP 进度条类

<?php
/*
调用示例：
$obj = new scroll_bar_class(200,true); //200为进度条的宽度，true为是否显示百分比
$num = 3000;
for($i = 0; $i <= $num; $i++){
      $obj->scroll_bar($i,$num);
}
*/
class scroll_bar_class{
      function scroll_bar_class( $width = 100,$list_percent = TRUE){
            $this->percent = 1;
            $this->width = $width;
            $this->list_percent = $list_percent;
            $create = true;
            if( $create ){
                  $this->create();
                  $create = false;
            }
      }
      function create(){
            if ( $this->list_percent ) $scroll_percent_html = '<td id="scroll_percent" nowrap></td>';
            echo '
            <table border="0" cellpadding="0" cellspacing="2" style="font-size:12px; margin:0; padding:0px;">
                  <tr>
                   <td nowrap>进度条：</td>
                   <td width="'.$this->width.'" style="background-repeat: repeat-x;background-color:#ECFFEC; border:1px #060 solid;" >
                   <div id="scroll_img" style="background-color:#060; width:1px; height:12px; line-height:12px; margin:0; padding:0px;"></div>
                   </td>
                   '.$scroll_percent_html.'
                  </tr>
            </table>
            ';
      }
      function scroll_bar($cur_amount,$max_amount){
            $this->percent = round(($cur_amount / $max_amount) * 100);
            echo('<script>document.getElementById("scroll_img").style.width = ' . ($this->percent / 100) * $this->width . ';</script>');
            if ( $this->list_percent ) echo('<script>document.getElementById("scroll_percent").innerHTML=" '.$this->percent.'%";</script>');
      }
}
?>