php图片处理类：缩略，裁剪，圆角，倾斜(1/3)

$img = imagecreate(180,50);

　　$ip = $_server['remote_addr'];

　　imagecolortransparent($img,$bgcolor);

　　$bgcolor = imagecolorallocate($img, 0x2c,0x6d,0xaf); // 背景颜色

　　$shadow = imagecolorallocate($img, 250,0,0); // 阴影颜色

　　$textcolor = imagecolorallocate($img, oxff,oxff,oxff); // 字体颜色

　　imagettftext($img,10,0,78,30,$shadow,"c:/windows/fonts/tahoma.ttf",$ip);

　　//显示背景

　　imagettftext($img,10,0,25,28,$textcolor,"c:/windows/fonts/tahoma.ttf","your ip is".$ip);

　　// 显示ip

　　imagepng($img);

　　imagecreatefrompng($img);

　　imagedestroy($img);

/*=====================
产生随机字符串函数
=====================*/
function random($length) {
 $hash = '';
 $chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz';
 $max = strlen($chars) - 1;
 mt_srand((double)microtime() * 1000000);
 for($i = 0; $i < $length; $i++) {
  $hash .= $chars[mt_rand(0, $max)];
 }
 return $hash;
}

//验证码图片生成

 session_start();
    //通知浏览器将要输出png图片
    header("content-type: image/png");
    //准备好随机数发生器种子 
    //srand((double)microtime()*1000000);
    //准备图片的相关参数  
    $im = imagecreate(62,22);
    $black = imagecolorallocate($im, 0,0,0);  //rgb黑色标识符
    $white = imagecolorallocate($im, 255,255,255); //rgb白色标识符
    $gray = imagecolorallocate($im, 179,183,185); //rgb灰色标识符
    //开始作图    
    imagefill($im,0,0,$gray);
    //while(($randval=rand()%100000)<10000);{
        //$_session["check_code"] = $randval;
        //将四位整数验证码绘入图片
  $randval=random(4);
  $_session["check_code"]=$randval;
        imagestring($im, 5, 10, 3, $randval, $white);
    //}
    //加入干扰象素   
    for($i=0;$i<150;$i++){
        $randcolor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagesetpixel($im, rand()%70 , rand()%30 , $white);
    }
    //输出验证图片
    imagepng($im);
    //销毁图像标识符
    imagedestroy($im);

?>

$directory = 'gallery';

$allowed_types=array('jpg','jpeg','gif','png');
$file_parts=array();
$ext='';
$title='';
$i=0;

$dir_handle = @opendir($directory) or die("there is an error with your image directory!");

while ($file = readdir($dir_handle))
{
 if($file=='.' || $file == '..') continue;
 
 $file_parts = explode('.',$file);
 $ext = strtolower(array_pop($file_parts));

 $title = implode('.',$file_parts);
 $title = htmlspecialchars($title);
 
 $nomargin='';
 
 if(in_array($ext,$allowed_types))
 {
  if(($i+1)%4==0) $nomargin='nomargin';
 
  echo '
  <div class="pic '.$nomargin.'" style="background:url('.$directory.'/'.$file.') no-repeat 50% 50%;">
  <a href="'.$directory.'/'.$file.'" title="'.$title.'" target="_blank">'.$title.'</a>
  </div>';
  
  $i++;
 }
}

closedir($dir_handle);