php怎么写注释？PHP代码添加注释的几种格式

<?php

  //向xls文件写入内容

  error_reporting(E_ALL);

  ini_set('display_errors', TRUE); 

  include'Classes/PHPExcel.php'     

  include'Classes/PHPExcel/IOFactory.php'

  //$data:xls文件内容正文

  //$title:xls文件内容标题

  //$filename:导出的文件名

  //$data和$title必须为utf-8码，否则会写入FALSE值

  functionwrite_xls($data=array(),$title=array(),$filename='report'){

    $objPHPExcel=newPHPExcel();

    //设置文档属性，设置中文会产生乱码，需要转换成utf-8格式！！

    // $objPHPExcel->getProperties()->setCreator("云舒")

               // ->setLastModifiedBy("云舒")

               // ->setTitle("产品URL导出")

               // ->setSubject("产品URL导出")

               // ->setDescription("产品URL导出")

               // ->setKeywords("产品URL导出");

    $objPHPExcel->setActiveSheetIndex(0);

    $cols='ABCDEFGHIJKLMNOPQRSTUVWXYZ'

    //设置www.jb51.net标题

    for($i=0,$length=count($title);$i<$length;$i++) {

      //echo $cols{$i}.Ƈ'

      $objPHPExcel->getActiveSheet()->setCellValue($cols{$i}.Ƈ',$title[$i]);

    }

    //设置标题样式

    $titleCount=count($title);

    $r=$cols{0}.Ƈ'

    $c=$cols{$titleCount}.Ƈ'

    $objPHPExcel->getActiveSheet()->getStyle("$r:$c")->applyFromArray(

      array(

        'font' =>array(

          'bold'  => true

        ),

        'alignment'=>array(

          'horizontal'=> PHPExcel_Style_Alignment::HORIZONTAL_RIGHT,

        ),

        'borders'=>array(

          'top'  =>array(

            'style'=> PHPExcel_Style_Border::BORDER_THIN

          )

        ),

        'fill'=>array(

          'type'   => PHPExcel_Style_Fill::FILL_GRADIENT_LINEAR,

          'rotation' => 90,

          'startcolor'=>array(

            'argb'=>'FFA0A0A0'

          ),

          'endcolor' =>array(

            'argb'=>'FFFFFFFF'

          )

        )

      )

    );

    $i= 0;

    foreach($dataas$d) {//这里用foreach,支持关联数组和数字索引数组

      $j= 0;

      foreach($das$v) { //这里用foreach,支持关联数组和数字索引数组

        $objPHPExcel->getActiveSheet()->setCellValue($cols{$j}.($i+2),$v);

        $j++;

      }

       $i++;

    }

    // 生成2003excel格式的xls文件

    header('Content-Type: application/vnd.ms-excel');

    header('Content-Disposition: attachment;filename="'.$filename.'.xls"');

    header('Cache-Control: max-age=0');

    $objWriter= PHPExcel_IOFactory::createWriter($objPHPExcel,'Excel5');

    $objWriter->save('php://output');

  }

  $array=array(

    array(1111,'名称','品牌','商品名','http://www.jb51.net'),

    array(1111,'名称','品牌','商品名','http://www.jb51.net'),

    array(1111,'名称','品牌','商品名','http://www.jb51.net'),

    array(1111,'名称','品牌','商品名','http://www.jb51.net'),

    array(1111,'名称','品牌','商品名','http://www.jb51.net'),

  );

  write_xls($array,array('商品id','供应商名称','品牌','商品名','URL'),'report');

?>

<?php

  //获取数据库数据(mysqli预处理学习)

  $config=array(

    'DB_TYPE'=>'mysql',

    'DB_HOST'=>'localhost',

    'DB_NAME'=>'test',

    'DB_USER'=>'root',

    'DB_PWD'=>'root',

    'DB_PORT'=>񠁚',

  );

  functiongetProductIdByName($name) {

    global$config;

    $id= false;

    $mysqli=newmysqli($config['DB_HOST'],$config['DB_USER'],$config['DB_PWD'],$config['DB_NAME']);

    if(mysqli_connect_error()) { //兼容 < php5.2.9 OO way:$mysqli->connect_error

      die("连接失败，错误码：".mysqli_connect_errno()."错误信息：".mysqli_connect_error());

    }

    //设置连接数据库的编码，不要忘了设置

    $mysqli->set_charset("gbk");

    //中文字符的编码要与数据库一致，若没设置，结果为null

    $name= iconv("utf-8","gbk//IGNORE",$name);

    if($mysqli_stmt=$mysqli->prepare("select id from 137_product where name like ?")) {

      $mysqli_stmt->bind_param("s",$name);

      $mysqli_stmt->execute();

      $mysqli_stmt->bind_result($id);

      $mysqli_stmt->fetch();

      $mysqli_stmt->close();

    }

    $mysqli->close();

    return$id; //得到的是gbk码（同数据库编码）

  } 

  $id= getProductIdByName('%伊奈卫浴伊奈分体座便器%');

  var_dump($id);

?>