防SQL注入

function clean($input)

{

  if (is_array($input))

  {

    foreach ($input as $key => $val)

     {

      $output[$key] = clean($val);

    }

  }

  else

  {

    $output = (string) $input;

    if (get_magic_quotes_gpc())

    {

      $output = stripslashes($output);

    }

    $output = htmlentities($output, ENT_QUOTES, 'UTF-8');

  }

  return $output;

}


根据IP确定用户地理位置

function detect_city($ip) {

    $default = 'UNKNOWN';

    $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

    $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);

    $ch = curl_init();

    $curl_opt = array(

      CURLOPT_FOLLOWLOCATION => 1,

      CURLOPT_HEADER   => 0,

      CURLOPT_RETURNTRANSFER => 1,

      CURLOPT_USERAGENT  => $curlopt_useragent,

      CURLOPT_URL    => $url,

      CURLOPT_TIMEOUT     => 1,

      CURLOPT_REFERER     => 'http://' . $_SERVER['HTTP_HOST'],

    );

    curl_setopt_array($ch, $curl_opt);

    $content = curl_exec($ch);

    if (!is_null($curl_info)) {

      $curl_info = curl_getinfo($ch);

    }

    curl_close($ch);

    if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) ) {

      $city = $regs[1];

    }

    if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) ) {

      $state = $regs[1];

    }

    if( $city!='' && $state!='' ){

     $location = $city . ', ' . $state;

     return $location;

    }else{

     return $default;

    }

  }


确定任意图片的主导颜色

function dominant_color($image)

{

　　$i = imagecreatefromjpeg($image);

　　for ($x=0;$x<imagesx($i);$x++) {

  　　　for ($y=0;$y<imagesy($i);$y++) {

    　　　　$rgb = imagecolorat($i,$x,$y);

    　　　　$r  = ($rgb >> 16) & 0xFF;

    　　　　$g  = ($rgb >> & 0xFF;

    　　　　$b  = $rgb & 0xFF;

    　　　　$rTotal += $r;

    　　　　$gTotal += $g;

    　　　　$bTotal += $b;

    　　　　$total++;

  　　 }

　　}

　　$rAverage = round($rTotal/$total);

　　$gAverage = round($gTotal/$total);

　　$bAverage = round($bTotal/$total);

　　return ["r"=>$rAverage,"g"=>$gAverage,"b"=>$bAverage];

}


强制下载文件

function force_download($file)

{

  $dir   = "../log/exports/";

  if ((isset($file))&&(file_exists($dir.$file))) {

    header("Content-type: application/force-download");

    header('Content-Disposition: inline; filename="' . $dir.$file . '"');

    header("Content-Transfer-Encoding: Binary");

    header("Content-length: ".filesize($dir.$file));

    header('Content-Type: application/octet-stream');

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

    readfile("$dir$file");

  } else {

    echo "No file selected";

  }

}


解压图片

function unzip($location,$newLocation)

{

    if(exec("unzip $location",$arr)){

      mkdir($newLocation);

      for($i = 1;$i< count($arr);$i++){

        $file = trim(preg_replace("~inflating: ~","",$arr[$i]));

        copy($location.'/'.$file,$newLocation.'/'.$file);

        unlink($location.'/'.$file);

      }

      return TRUE;

    }else{

      return FALSE;

    }

}


缩放图片

function resize_image($filename, $tmpname, $xmax, $ymax)

{

  $ext = explode(".", $filename);

  $ext = $ext[count($ext)-1]; 

  if($ext == "jpg" || $ext == "jpeg")

    $im = imagecreatefromjpeg($tmpname);

  elseif($ext == "png")

    $im = imagecreatefrompng($tmpname);

  elseif($ext == "gif")

    $im = imagecreatefromgif($tmpname); 

  $x = imagesx($im);

  $y = imagesy($im); 

  if($x <= $xmax && $y <= $ymax)

    return $im; 

  if($x >= $y) {

    $newx = $xmax;

    $newy = $newx * $y / $x;

  }

  else {

    $newy = $ymax;

    $newx = $x / $y * $newy;

  } 

  $im2 = imagecreatetruecolor($newx, $newy);

  imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);

  return $im2;

}


检测用户浏览器语言

function get_client_language($availableLanguages, $default='en'){

  if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {

    $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);

    foreach ($langs as $value){

      $choice=substr($value,0,2);

      if(in_array($choice, $availableLanguages)){

        return $choice;

      }

    }

  }

  return $default;

}