PHP保留两位小数 四舍五入方法

$num = 123213.666666; 
echo sprintf("%.2f", $num); 

<?php
$number = 123;
$txt = sprintf("%f",$number);
echo $txt;
?>

输出：

123.000000

$num = 123213.666666; 
echo sprintf("%.2f",substr(sprintf("%.3f", $num), 0, -2)); 

$number = 1234.5678;
$nombre_format_francais = number_format($number, 2, ',', ' '); // 1234,57
$english_format_number = number_format($number, 2, '.', '');   // 1234.57（我一般用这个）

<?php
echo(round(0.60));
echo(round(0.50));
echo(round(0.49));
echo(round(-4.40));
echo(round(-4.60));
?>

输出：

1
1
0
-4
-5

$number = 1234.5678;
echo round($number ,2); //1234.57

$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

if (ftp_put($conn_id, $remote_file, $file, FTP_BINARY)) {
  echo "文件移动成功";
} else {
  echo "移动失败";
}
ftp_close($conn_id);

if (is_uploaded_file($_FILES['uploadfile']['tmp_name'])) {
  $ftp_server = "192.168.1.105";
  $ftp_user_name = "lesley";
  $ftp_user_pass = "123456";
  $conn_id = ftp_connect($ftp_server) or die("Couldn't connect to $ftp_server");
  $file = $_FILES['uploadfile']['tmp_name'];
  $remote_file = '/test/'.$_FILES['uploadfile']['name'];
  $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

  if (ftp_put($conn_id, $remote_file, $file, FTP_BINARY)) {
    echo "文件:".$_FILES['uploadfile']['name']."上传成功";
  } else {
    echo "上传失败";
  }
  ftp_close($conn_id);
}

<form action="uploadfile.php" method="post" enctype="multipart/form-data">
  <input type="file" name="uploadfile" id="uploadfile" />
  <input type="submit" name="submit" value="submit" />
</form>

<?php 
/**
* desc：FTP类
* link：www.111cn.net
* date：2013/02/24
*/ 
class ftp 
{ 
public $off;  // 返回操作状态(成功/失败) 
public $conn_id;  // FTP连接 
 
/**
* 方法：FTP连接
* @FTP_HOST -- FTP主机
* @FTP_PORT -- 端口
* @FTP_USER -- 用户名
* @FTP_PASS -- 密码
*/ 
function __construct($FTP_HOST,$FTP_PORT,$FTP_USER,$FTP_PASS) 
{ 
$this->conn_id = @ftp_connect($FTP_HOST,$FTP_PORT) or die("FTP服务器连接失败"); 
@ftp_login($this->conn_id,$FTP_USER,$FTP_PASS) or die("FTP服务器登陆失败"); 
@ftp_pasv($this->conn_id,1); // 打开被动模拟 
} 
 
/**
* 方法：上传文件
* @path-- 本地路径
* @newpath -- 上传路径
* @type-- 若目标目录不存在则新建
*/ 
function up_file($path,$newpath,$type=true) 
{ 
if($type) $this->dir_mkdirs($newpath); 
$this->off = @ftp_put($this->conn_id,$newpath,$path,FTP_BINARY); 
if(!$this->off) echo "文件上传失败,请检查权限及路径是否正确！"; 
} 
 
/**
* 方法：移动文件
* @path-- 原路径
* @newpath -- 新路径
* @type-- 若目标目录不存在则新建
*/ 
function move_file($path,$newpath,$type=true) 
{ 
if($type) $this->dir_mkdirs($newpath); 
$this->off = @ftp_rename($this->conn_id,$path,$newpath); 
if(!$this->off) echo "文件移动失败,请检查权限及原路径是否正确！"; 
} 
 
/**
* 方法：复制文件
* 说明：由于FTP无复制命令,本方法变通操作为：下载后再上传到新的路径
* @path-- 原路径
* @newpath -- 新路径
* @type-- 若目标目录不存在则新建
*/ 
function copy_file($path,$newpath,$type=true) 
{ 
$downpath = "c:/tmp.dat"; 
$this->off = @ftp_get($this->conn_id,$downpath,$path,FTP_BINARY);// 下载 
if(!$this->off) echo "文件复制失败,请检查权限及原路径是否正确！"; 
$this->up_file($downpath,$newpath,$type); 
} 
 
/**
* 方法：删除文件
* @path -- 路径
*/ 
function del_file($path) 
{ 
$this->off = @ftp_delete($this->conn_id,$path); 
if(!$this->off) echo "文件删除失败,请检查权限及路径是否正确！"; 
} 
 
/**
* 方法：生成目录
* @path -- 路径
*/ 
function dir_mkdirs($path) 
{ 
$path_arr  = explode('/',$path);  // 取目录数组 
$file_name = array_pop($path_arr);// 弹出文件名 
$path_div  = count($path_arr);// 取层数 
 
foreach($path_arr as $val)// 创建目录 
{ 
if(@ftp_chdir($this->conn_id,$val) == FALSE) 
{ 
$tmp = @ftp_mkdir($this->conn_id,$val); 
if($tmp == FALSE) 
{ 
echo "目录创建失败,请检查权限及路径是否正确！"; 
exit; 
} 
@ftp_chdir($this->conn_id,$val); 
} 
} 
 
for($i=1;$i<=$path_div;$i++)  // 回退到根 
{ 
@ftp_cdup($this->conn_id); 
} 
} 
 
/**
* 方法：关闭FTP连接
*/ 
function close() 
{ 
@ftp_close($this->conn_id); 
} 
} 
// class class_ftp end
?>

<?
/***
* desc：调用示例
* link：www.111cn.net
* date：2013/2/24
*/
$ftp = new ftp('192.168.0.249',21,'hlj','123456');  // 打开FTP连接
$ftp->up_file('aa.wav','test/13548957217/bb.wav'); // 上传文件
//$ftp->move_file('aaa/aaa.php','aaa.php');// 移动文件
//$ftp->copy_file('aaa.php','aaa/aaa.php');// 复制文件
//$ftp->del_file('aaa.php');   // 删除文件
$ftp->close(); // 关闭FTP连接
?>

<?php
$str=‘中文a字1符‘;
echo strlen($str);
echo ‘<br />‘;
echo mb_strlen($str,‘UTF8‘);
//输出结果
//14
//6
?>

<?php
$str=‘中文a字1符‘;
//计算如下
echo (strlen($str) + mb_strlen($str,‘UTF8‘)) / 2;
echo
//输出结果
//10
?>

<?php

//测试时文件的编码方式要是UTF8

$str='中文a字1符';

echo strlen($str).'<br>';//14

echo mb_strlen($str,'utf8').'<br>';//6

echo mb_strlen($str,'gbk').'<br>';//8

echo mb_strlen($str,'gb2312').'<br>';//10

?> 

/**
* PHP获取字符串中英文混合长度
* @param $str string 字符串
* @param $$charset string 编码
* @return 返回长度，1中文=1位，2英文=1位
*/
function strLength($str,$charset='utf-8'){
if($charset=='utf-8') $str = iconv('utf-8','gb2312',$str);
$num = strlen($str);
$cnNum = 0;
for($i=0;$i<$num;$i++){
if(ord(substr($str,$i+1,1))>127){
$cnNum++;
$i++;
}
}
$enNum = $num-($cnNum*2);
$number = ($enNum/2)+$cnNum;
return ceil($number);
}

//测试输出长度都为15
$str1 = '测试测试测试测试测试测试测试测';
$str2 = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
$str3 = 'aa测试aa测试aa测试aa测试aaaaaa';
echo strLength($str1,'gb2312');
echo strLength($str2,'gb2312');
echo strLength($str3,'gb2312');

function msubstr($str, $start, $len) {
 $tmpstr = "";
 $strlen = $start + $len;
 for($i = 0; $i < $strlen; $i++){
  if(ord(substr($str, $i, 1)) > 127){
   $tmpstr.=substr($str, $i, 3);
   $i+=2;
  }else
   $tmpstr.= substr($str, $i, 1);
 }
 return $tmpstr;
}
echo msubstr("一二三天下致公english",0,10);

<?php
function msubstr($str, $start, $len) {   //ȡ
   $tmpstr = "";
   $strlen = $start + $len;
   if(preg_match('/[/d/s]{2,}/',$str)){$strlen=$strlen-2;}
   for($i = 0; $i < $strlen; $i++) {
       if(ord(substr($str, $i, 1)) > 0xa0) {
           $tmpstr .= substr($str, $i, 2);
           $i++;
       } else
           $tmpstr .= substr($str, $i, 1);
     }
   return $tmpstr;
 }
 
?>

function cc_msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
{
 if(function_exists("mb_substr"))
  return mb_substr($str, $start, $length, $charset);
 elseif(function_exists('iconv_substr')) {
  return iconv_substr($str,$start,$length,$charset);
 }
 $re['utf-8']   = "/[/x01-/x7f]|[/xc2-/xdf][/x80-/xbf]|[/xe0-/xef][/x80-/xbf]{2}|[/xf0-/xff]

[/x80-/xbf]{3}/";
 $re['gb2312'] = "/[/x01-/x7f]|[/xb0-/xf7][/xa0-/xfe]/";
 $re['gbk']   = "/[/x01-/x7f]|[/x81-/xfe][/x40-/xfe]/";
 $re['big5']   = "/[/x01-/x7f]|[/x81-/xfe]([/x40-/x7e]|/xa1-/xfe])/";
 preg_match_all($re[$charset], $str, $match);
 $slice = join("",array_slice($match[0], $start, $length));
 if($suffix) return $slice."…";
 return $slice;
}

strstr(string,string) = strchr(,) //从前面第一次出现某个字符串的地方截取到最后
strrchr(string,string) //从某个字符串从最后出现的位置截取到结尾
strpos(string,string[,int]) //某个字符串第一次出现的位置
strrpos(string,string) //某个字符串最后一次出现的位置
substr(string,int[,int]) //从指定位置开始截取字符串，可以指定截取的长度。
strlen(string) //获取字符串的长度

<?PHP
  header('Content-type: text/html; charset=utf-8');
  $str = "在士大夫了sdfsdfcxvzv一截";

  $pa = '/[x{4e00}-x{9fa5}]/siu';
  preg_match_all($pa, $str, $r);
 
  $count = count($r[0]);
  echo "当前的字符串中，共有 $count 个汉字";
 
  if($count>10)
  {
    //如果汉字数量大于10，你的代码
  }

?>

支持gb2312,gbk,utf-8,big5 中文截取方法

/*  
 
* 中文截取，支持gb2312,gbk,utf-8,big5  
 
*  
 
* @param string $str 要截取的字串  
 
* @param int $start 截取起始位置  
 
* @param int $length 截取长度  
 
* @param string $charset utf-8|gb2312|gbk|big5 编码  
 
* @param $suffix 是否加尾缀  
 
*/
 
public function csubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)  
 
{  
 
   if(function_exists("mb_substr"))  
 
   {  
 
       if(mb_strlen($str, $charset) <= $length) return $str;  
 
       $slice = mb_substr($str, $start, $length, $charset);  
 
   }  
 
   else
 
   {  
 
       $re['utf-8']   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff]

[x80-xbf]{3}/";  
 
       $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";  
 
       $re['gbk']          = "/[x01-x7f]|[x81-xfe][x40-xfe]/";  
 
       $re['big5']          = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";  
 
       preg_match_all($re[$charset], $str, $match);  
 
       if(count($match[0]) <= $length) return $str;  
 
       $slice = join("",array_slice($match[0], $start, $length));  
 
   }  
 
   if($suffix) return $slice."…";  
 
   return $slice;  
 
}

<?php
 
  class Table_export extends CI_Controller {
  
      function __construct()
      {
          parent::__construct();
  
          // Here you should add some sort of user validation
          // to prevent strangers from pulling your table data
      }
  
      function index($table_name)
      {
          $query = $this->db->get($table_name);
  
          if(!$query)
              return false;
  
          // Starting the PHPExcel library
          $this->load->library('PHPExcel');
          $this->load->library('PHPExcel/IOFactory');
  
          $objPHPExcel = new PHPExcel();
          $objPHPExcel->getProperties()->setTitle("export")->setDescription("none");
  
          $objPHPExcel->setActiveSheetIndex(0);
  
          // Field names in the first row
          $fields = $query->list_fields();
          $col = 0;
          foreach ($fields as $field)
          {
              $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $field);
              $col++;
          }
  
          // Fetching the table data
          $row = 2;
          foreach($query->result() as $data)
          {
              $col = 0;
              foreach ($fields as $field)
              {
                  $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $data->$field);
                  $col++;
              }
  
              $row++;
          }
  
          $objPHPExcel->setActiveSheetIndex(0);
  
          $objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');
  
          // Sending headers to force the user to download the file
          header('Content-Type: application/vnd.ms-excel');
          header('Content-Disposition: attachment;filename="Products_'.date('dMy').'.xls"');
          header('Cache-Control: max-age=0');
  
          $objWriter->save('php://output');
      }
  
  }

Excel Plugin
The following plugin will generate a tab-delimited file, and feed it to the client as an Excel file.

$this->load->plugin('to_excel');
$this->db->use_table('tablename');
$this->db->select('field1', 'field2');
// run joins, order by, where, or anything else here
$query = $this->db->get();
to_excel($query, ['filename']); // filename is optional, without it, the plugin will default to 'exceloutput'

So you could run:

to_excel($query, 'myfile'); // outputs myfile.xls
to_excel($query); // outputs exceloutput.xls
// you could also use a model here
to_excel($this->model_name->functioncall());

/system/plugins/to_excel_pi.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

/*
* Excel library for Code Igniter applications
* Author: Derek Allard, Dark Horse Consulting, www.darkhorse.to, April 2006
*/

function to_excel($query, $filename='exceloutput')
{
     $headers = ''; // just creating the var for field headers to append to below
     $data = ''; // just creating the var for field data to append to below
    
     $obj =& get_instance();
    
     $fields = $query->field_data();
     if ($query->num_rows() == 0) {
          echo '<p>The table appears to have no data.</p>';
     } else {
          foreach ($fields as $field) {
             $headers .= $field->name . "t";
          }
    
          foreach ($query->result() as $row) {
               $line = '';
               foreach($row as $value) {                                           
                    if ((!isset($value)) OR ($value == "")) {
                         $value = "t";
                    } else {
                         $value = str_replace('"', '""', $value);
                         $value = '"' . $value . '"' . "t";
                    }
                    $line .= $value;
               }
               $data .= trim($line)."n";
          }
         
          $data = str_replace("r","",$data);
                        
          header("Content-type: application/x-msdownload");
          header("Content-Disposition: attachment; filename=$filename.xls");
          echo "$headersn$data"; 
     }
}
?>