PHP字符截取函数，兼容各类gbk,utf-8编码

function CsubStrPro($str, $start, $length, $charset = "utf-8", $suffix = false)
{
    if (function_exists ( "mb_substr" ))
        return mb_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;
}

 function subString_UTF8($str, $start, $lenth)
    {
        $len = strlen($str);
        $r = array();
        $n = 0;
        $m = 0;
        for($i = 0; $i < $len; $i++) {
            $x = substr($str, $i, 1);
            $a  = base_convert(ord($x), 10, 2);
            $a = substr('00000000'.$a, -8);
            if ($n < $start){
                if (substr($a, 0, 1) == 0) {
                }elseif (substr($a, 0, 3) == 110) {
                    $i += 1;
                }elseif (substr($a, 0, 4) == 1110) {
                    $i += 2;
                }
                $n++;
            }else{
                if (substr($a, 0, 1) == 0) {
                    $r[ ] = substr($str, $i, 1);
                }elseif (substr($a, 0, 3) == 110) {
                    $r[ ] = substr($str, $i, 2);
                    $i += 1;
                }elseif (substr($a, 0, 4) == 1110) {
                    $r[ ] = substr($str, $i, 3);
                    $i += 2;
                }else{
                    $r[ ] = '';
                }
                if (++$m >= $lenth){
                    break;
                }
            }
        }
        return $r;
    } // End subString_UTF8;
}// End String

<?php
class files{
/**
* upload
*
* 文件上传
*
* @param String $path e.g. Zend_Registry::get('upload')
* @param Array $files e.g. $_FILES['Filedata']
* @param String $dir e.g. $_POST['dir']
*
* return Array $msg e.g. if($msg['error'])
*/
static function upload($path,$files,$dir)
{
$msg=array();

//文件保存目录路径
$save_path = $path;
//文件保存目录URL
$save_url = $path;
//定义允许上传的文件扩展名
$ext_arr = array(
'image' => array('gif', 'jpg', 'jpeg', 'png', 'bmp'),
'flash' => array('swf', 'flv'),
'media' => array('swf', 'flv', 'mp3', 'wav', 'wm
a', 'wmv', 'mid', 'avi', 'mpg', 'asf', 'rm', 'rmvb'),
'file' => array('doc', 'docx', 'xls', 'xlsx', 'pp
t', 'htm', 'html', 'txt', 'zip', 'rar', 'gz', 'bz2'),
);
//最大文件大小
$max_size = 1000000;

$save_path = realpath($save_path) . '/';

//有上传文件时
if (empty($_FILES) === false) {
//原文件名
$file_name = $files['name'];
//服务器上临时文件名
$tmp_name = $files['tmp_name'];
//文件大小
$file_size = $files['size'];
//目录名
$dir_name = empty($dir) ? 'image' : trim($dir);
//检查文件名
if (!$file_name) {
$msg['error'] = "请选择文件。";
}
//检查目录
else if (@is_dir($save_path) === false) {
$msg['error'] = "上传目录不存在。请联系管理员";
}
//检查目录写权限
else if (@is_writable($save_path) === false) {
$msg['error'] = "上传目录没有写权限。请联系管理员";
}
//检查是否已上传
else if (@is_uploaded_file($tmp_name) === false) {
$msg['error'] = "临时文件可能不是上传文件。请重新上传";
}
//检查文件大小
else if ($file_size > $max_size) {
$msg['error'] = "上传文件大小超过限制。";
}
//检查目录名
else if (empty($ext_arr[$dir_name])) {
$msg['error'] = "目录名不正确。";
}
else
{
//获得文件扩展名
$temp_arr = explode(".", $file_name);
$file_ext = array_pop($temp_arr);
$file_ext = trim($file_ext);
$file_ext = strtolower($file_ext);
//检查扩展名
if (in_array($file_ext, $ext_arr[$dir_name]) === false) {
$msg['error'] = "上传文件扩展名是不允许的扩展名。
n只允许" . implode(",", $ext_arr[$dir_name]) . "格式。";
}
else
{
//创建文件夹

$dbsave = ""; //数据库中存放的路径

if ($dir_name !== '') {
$save_path .= $dir_name . "/";
$save_url .= $dir_name . "/";
$dbsave = $dir_name.'/';
if (!file_exists($save_path)) {
mkdir($save_path);
}
}

$y = date("Y");
$m = date("m");
$d = date("d");

$save_path .= $y . "/";
$save_url .= $y . "/";
$dbsave .= $y.'/';
if (!file_exists($save_path)) {
mkdir($save_path);
}

$save_path .= $m . "/";
$save_url .= $m . "/";
$dbsave .= $m.'/';
if (!file_exists($save_path)) {
mkdir($save_path);
}

$save_path .= $d . "/";
$save_url .= $d . "/";
$dbsave .= $d.'/';
if (!file_exists($save_path)) {
mkdir($save_path);
}

//新文件名
$new_file_name = date("YmdHis") . '_' . rand(1000
0, 99999) . '.' . $file_ext;
//移动文件
$file_path = $save_path . $new_file_name;

if (move_uploaded_file($tmp_name, $file_path) === false) {
$msg['error'] = "上传文件失败。";
}
//数据库最终存储的文件
$dbsave .= $new_file_name;
@chmod($file_path, 0644);
$file_url = $save_url . $new_file_name;
$msg['file_url'] = $file_url;
$msg['file_size'] = $file_size;
$msg['db_path'] = $dbsave;
}//检查扩展名
}//目录正确性
return $msg;
}
}
//文件上传
}
?>

<?php
//range 是将1到100 列成一个数组
$numbers = range (1,100);
//shuffle 将数组顺序随即打乱
shuffle ($numbers);
//array_slice 取该数组中的某一段
$no=6;
$result = array_slice($numbers,0,$no);
for ($i=0;$i<$no;$i++){
echo $result[$i]."<br>";
}
print_r($result);
?>

//range 是将1到42 列成一个数组
$numbers = range (1,42);
//shuffle 将数组顺序随即打乱
shuffle ($numbers);
//array_slice 取该数组中的某一段
$result = array_slice($numbers,0,3);
print_r($result);

<?php
$numbers = range (1,20);
srand ((float)microtime()*1000000);
shuffle ($numbers);
while (list (, $number) = each ($numbers)) {
echo "$number ";
}
?>

<?php
function NoRand($begin=0,$end=20,$limit=5){
$rand_array=range($begin,$end);
shuffle($rand_array);//调用现成的数组随机排列函数
return array_slice($rand_array,0,$limit);//截取前$limit个
}
print_r(NoRand());
?>

<?php
$tmp=array();
while(count($tmp)<5){
$tmp[]=mt_rand(1,20);
$tmp=array_unique($tmp);
}
print join(',',$tmp);
?>

<?php
/*
* array unique_rand( int $min, int $max, int $num )
* 生成一定数量的不重复随机数
* $min 和 $max: 指定随机数的范围
* $num: 指定生成数量
*/
function unique_rand($min, $max, $num) {
    $count = 0;
    $return = array();
    while ($count < $num) {
        $return[] = mt_rand($min, $max);
        $return = array_flip(array_flip($return));
        $count = count($return);
    }
    shuffle($return);
    return $return;
}

$arr = unique_rand(1, 25, 16);
sort($arr);

$result = '';
for($i=0; $i < count($arr);$i++)
{
 $result .= $arr[$i].',';
}
$result = substr($result, 0, -1);
echo $result;
?>

程序运行如下：

1 2,3,4,6,7,8,9,10,11,12,13,16,20,21,22,24

Array (
 [0] => 0
 [1] => 1
 [2] => 2
 [3] => 3
 [4] => 4
 [5] => 5
 [6] => 6
 [7] => 7
 [8] => 8
 [9] => 9
 [10] => a
 [11] => b
 [12] => c
 [13] => d
 [14] => e
 [15] => f
 [16] => g
 [17] => h
 [18] => i
 [19] => j
 [20] => k
 [21] => l
 [22] => m
 [23] => n
 [24] => o
 [25] => p
 [26] => q
 [27] => r
 [28] => s
 [29] => t
 [30] => u
 [31] => v
 [32] => w
 [33] => x
 [34] => y
 [35] => z
)

<?php
// 生成0123456789abcdefghijklmnopqrstuvwxyz中的一个字符
function getOptions()
{
  $options = array();
  $result = array();
  for($i=48; $i<=57; $i++)
  {
      array_push($options,chr($i)); 
  }
  for($i=65; $i<=90; $i++)
   {
       $j = 32;
       $small = $i + $j;
       array_push($options,chr($small));
 }
  return $options;
}
/*
$e = getOptions();
for($j=0; $j<150; $j++)
{
 echo $e[$j];
}
*/
$len = 10;
// 随机生成数组索引，从而实现随机数
for($j=0; $j<100; $j++)
{
  $result = "";
  $options = getOptions();
  $lastIndex = 35;
  while (strlen($result)<$len)
  {
    // 从0到35中随机取一个作为索引
  $index = rand(0,$lastIndex);
  // 将随机数赋给变量 $chr
    $chr = $options[$index];
  // 随机数作为 $result 的一部分
    $result .= $chr;
    $lastIndex = $lastIndex-1;
  // 最后一个索引将不会参与下一次随机抽奖
    $options[$index] = $options[$lastIndex];
  }
  echo $result."n";
}
?>

<form id=”content” action=”hello.php” method=”post” target=”yframe” enctype=”multipart/form-data”>
<input type=”file” name=”tValue”>
<input type=”submit” value=”submit”>
<iframe name=”yframe” src=”hello.php” style=”border:none;”></iframe>
</form>
<input type=”text”>

<?php
//echo $_FILES["tValue"]["tmp_name"];
if(move_uploaded_file($_FILES["tValue"]["tmp_name"], “img/a.jpg”))
{
echo “<img src=’img/a.jpg’ width=’250px’height=’130px’>”;
}
?>

MyClass::model()->deleteAllByAttributes(array(
    'phone_number'=>$phoneNumber,
));

MyClass::model()->deleteAllByAttributes(array(),'`phone_number` = :phone_number',array(
    ':phone_number'=>$phoneNumber,
));

MyClass::model()->deleteAll('`phone_number` = :phone_number',array(
    ':phone_number'=>$phoneNumber,
));

$condition = new CDbCriteria();
$condition->addCondition('status=:status');
$condition->params = array(':status'=>1);
$condition->addInCondition('user_id',array(100111,100221,100221));
User::model()->deleteAll($condition);Dao带in条件的示例

Yii::app()->db->createCommand()
->delete('mw_user', array('and', 'user_id=:user_id', array('in', 'position_id', array(1,2,3))),array(':user_id'=>121111));