PHP的自定义函数（非源生自带）

这是一些自定义封装的函数类，调用起来很方便，以后会有更多的封装函数更新！

// 弹框跳转function alert($msg,$url=‘‘){   echo "<script>";   echo "alert(‘$msg‘);";   if($url){      echo "window.location.href=‘$url‘;";   }else{      echo "window.history.go(-1);";   }   echo "</script>";}

//获取单条数据function getONE($sql){   $sql = mysql_query($sql);   $list = array();   if($sql && mysql_affected_rows()>0){      $list = mysql_fetch_assoc($sql);   }return $list;}

//获取多条数据function getALL($sql){   $sql = mysql_query($sql);   $list = array();   if($sql && mysql_affected_rows()>0){      while($row = mysql_fetch_assoc($sql)){      $list[] = $row;      }   }return $list;}

/** * [delete 删除数据] * @param  [string] $table [表名] * @param  [string] $where [条件] * @return [boolean]       [返回结果] *///删除数据SQL语句封装function delete($table,$where){   //构造删除的SQL语句   $sql = "DELETE FROM `$table` WHERE $where;";      // dump($sql);exit;   //把SQL语句执行   $res = mysql_query($sql);   //判断是否执行成功   if($res && mysql_affected_rows()>0){      return true;   }else{      return false;   }}

/** * [update 更新数据] * @param  [string] $table [表名] * @param  [array]  $array [要更新的数据] * @param  [string] $where [条件] * @return [type]        [返回结果] *///更新数据SQL语句封装function update($table,$array,$where){   $str = ‘‘;   foreach($array as $key => $value){      $str .= "`".$key."`=‘".$value."‘,";   }   //去除最右边的逗号   $str = rtrim($str,‘,‘);   //构造更新的SQL语句   $sql = "UPDATE `$table` SET $str WHERE $where";   // dump($sql);exit;   $res = mysql_query($sql);   //判断是否执行成功   if($res){      return true;   }else{      return false;   }}

/** * [insert 插入数据] * @param  [string] $table [表名] * @param  [array] $data  [数据] * @return [bool]        [是否成功] */function insert($table,$data){   $tmp = array_keys($data);   $field = ‘`‘.implode(‘`,`‘, $tmp).‘`‘;

   $value =  "‘".implode("‘,‘",$data)."‘";

   $sql = "INSERT INTO $table ($field) VALUES ($value)";   // dump($sql);exit;   $res = mysql_query($sql);   if($res && mysql_affected_rows()>0){      return mysql_insert_id();   }else{      return false;   }}

//pre预排版打印function dump($content){   echo "<pre>";   print_r($content);   echo "</pre>";}

/** *  * 字符截取 * @param string $string * @param int $start * @param int $length * @param string $charset * @param string $dot *  * @return string */function str_cut(&$string, $start, $length, $charset = "utf-8", $dot = ‘...‘) {   if(function_exists(‘mb_substr‘)) {      if(mb_strlen($string, $charset) > $length) {         return mb_substr ($string, $start, $length, $charset) . $dot;      }      return mb_substr ($string, $start, $length, $charset);

   }else if(function_exists(‘iconv_substr‘)) {      if(iconv_strlen($string, $charset) > $length) {         return iconv_substr($string, $start, $length, $charset) . $dot;      }      return iconv_substr($string, $start, $length, $charset);   }

   $charset = strtolower($charset);   switch ($charset) {      case "utf-8" :         preg_match_all("/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $string, $ar);         if(func_num_args() >= 3) {            if (count($ar[0]) > $length) {               return join("", array_slice($ar[0], $start, $length)) . $dot;            }            return join("", array_slice($ar[0], $start, $length));         } else {            return join("", array_slice($ar[0], $start));         }         break;      default:         $start = $start * 2;         $length   = $length * 2;         $strlen = strlen($string);         for ( $i = 0; $i < $strlen; $i++ ) {            if ( $i >= $start && $i < ( $start + $length ) ) {               if ( ord(substr($string, $i, 1)) > 129 ) $tmpstr .= substr($string, $i, 2);               else $tmpstr .= substr($string, $i, 1);            }            if ( ord(substr($string, $i, 1)) > 129 ) $i++;         }         if ( strlen($tmpstr) < $strlen ) $tmpstr .= $dot;                  return $tmpstr;   }}

/** * [uploads 文件上传函数] * @param  [string]  $name    [表单域的name名] * @param  [string]  $catalog [文件保存的路径] * @param  array   $type    [允许上传的文件类型] * @param  integer $size    [允许上传的文件大小] * @return [array]           [error 1 上传失败 2 上传成功] */function uploads($name,$catalog,$type=array(‘jpg‘,‘jpeg‘,‘gif‘,‘png‘),$size=1048576){   $status = $_FILES[$name][‘error‘];   if($status>0){      switch($status){         case 1:             $res[‘msg‘] = "文件上传超过最大值2M";            $res[‘err‘] = 1;            return $res;            break;         case 2:            $res[‘msg‘] = "文件上传超过MAX_FILE_SIZE大小";            $res[‘err‘] = 1;            return $res;            break;         case 3:            $res[‘msg‘] =  "文件上传失败";            $res[‘err‘] = 1;            return $res;            break;         case 4:            $res[‘msg‘] =  ‘请选择文件‘;            $res[‘err‘] = 1;            return $res;            break;         default:            break;      }   }

   if($_FILES[$name][‘size‘]>$size){      $res[‘msg‘] = ‘上传文件超出指定大小‘;      $res[‘err‘] = 1;      return $res;         }   $ext = pathinfo($_FILES[$name][‘name‘],PATHINFO_EXTENSION);   if(!in_array($ext,$type)){      $res[‘msg‘] = ‘请上传指定的文件类型‘;      $res[‘err‘] = 1;      return $res;   }   //第一种做法   $catalog = rtrim($catalog,‘/‘);   $file_dir = date(‘Y/m/d‘);   $dir = $catalog.‘/‘.$file_dir;   if(!is_dir($dir)){      mkdir($dir,0777,true);   }   do{      $file = time().mt_rand(1000,9999);      $filename = $file.‘.‘.$ext;      $newname = $dir.‘/‘.$filename;   }while(is_file($dir.‘/‘.$filename));      move_uploaded_file($_FILES[$name][‘tmp_name‘], $dir.‘/‘.$filename);   $res[‘msg‘] = ‘文件上传成功‘;   $res[‘err‘] = 2;   $res[‘filename‘] = $file_dir.‘/‘.$filename;   $res[‘name‘] = $filename;   return $res;}

//封装缩略图的函数function small($file,$widths,$heights,$address){   $filename="$file";   $info = getimagesize($filename);

   //获取图片的宽   $width = $info[0];   //获取图片的高   $height = $info[1];

   //打开图片   if($info[2]==1){      $parent = imagecreatefromgif($filename);   }else if($info[2]==2){      $parent = imagecreatefromjpeg($filename);   }else if($info[2]==3){      $parent = imagecreatefrompng($filename);   }

   $son_width = $widths;   $son_height = $heights;   // 等比例缩放   // $son_height = ceil(($height*$son_width)/$width);

   //w/h = s_w/s_h   //新建图像   $son = imagecreatetruecolor($son_width,$son_height);

   imagecopyresized($son,$parent,0,0,0,0,$son_width,$son_height,$width,$height);   $path = pathinfo($filename,PATHINFO_EXTENSION);   $time = time();   $pathname = $time.mt_rand(1000,9999).‘.‘.$path;

   $save = $address.$pathname;   if($info[2]==1){      imagegif($son,$save);   }else if($info[2]==2){      imagejpeg($son,$save);   }else if($info[2]==3){      imagepng($son,$save);   }   imagedestroy($son);   imagedestroy($parent);   return $pathname;   }

/** * 获得用户的真实IP地址 * * @access  public * @return  string */function real_ip(){    static $realip = NULL;

    if ($realip !== NULL)    {        return $realip;    }

    if (isset($_SERVER))    {        if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘]))        {            $arr = explode(‘,‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘]);

            /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */            foreach ($arr AS $ip)            {                $ip = trim($ip);

                if ($ip != ‘unknown‘)                {                    $realip = $ip;

                    break;                }            }        }        elseif (isset($_SERVER[‘HTTP_CLIENT_IP‘]))        {            $realip = $_SERVER[‘HTTP_CLIENT_IP‘];        }        else        {            if (isset($_SERVER[‘REMOTE_ADDR‘]))            {                $realip = $_SERVER[‘REMOTE_ADDR‘];            }            else            {                $realip = ‘0.0.0.0‘;            }        }    }    else    {        if (getenv(‘HTTP_X_FORWARDED_FOR‘))        {            $realip = getenv(‘HTTP_X_FORWARDED_FOR‘);        }        elseif (getenv(‘HTTP_CLIENT_IP‘))        {            $realip = getenv(‘HTTP_CLIENT_IP‘);        }        else        {            $realip = getenv(‘REMOTE_ADDR‘);        }    }    preg_match("/[\d\.]{7,15}/", $realip, $onlineip);    $realip = !empty($onlineip[0]) ? $onlineip[0] : ‘0.0.0.0‘;    return $realip;}