php按指定大小等比缩放生成上传图片缩略图

php教程按指定大小等比缩放生成上传图片缩略图
/**
 * *
 *等比缩放
 * @param unknown_type $srcImage   源图片路径
 * @param unknown_type $toFile     目标图片路径
 * @param unknown_type $maxWidth   最大宽
 * @param unknown_type $maxHeight  最大高
 * @param unknown_type $imgQuality 图片质量
 * @return unknown
 */

function resize($srcImage,$toFile,$maxWidth = 100,$maxHeight = 100,$imgQuality=100)
{
 
    list($width, $height, $type, $attr) = getimagesize($srcImage);
    if($width < $maxWidth  || $height < $maxHeight) return ;
    switch ($type) {
    case 1: $img = imagecreatefromgif($srcImage); break;
    case 2: $img = imagecreatefromjpeg($srcImage); break;
    case 3: $img = imagecreatefrompng($srcImage); break;
    }
    $scale = min($maxWidth/$width, $maxHeight/$height); //求出绽放比例
   
    if($scale < 1) {
    $newWidth = floor($scale*$width);
    $newHeight = floor($scale*$height);
    $newImg = imagecreatetruecolor($newWidth, $newHeight);
    imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
    $newName = "";
    $toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile);

    switch($type) {
        case 1: if(imagegif($newImg, "$toFile$newName.gif", $imgQuality))
        return "$newName.gif"; break;
        case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
        return "$newName.jpg"; break;
        case 3: if(imagepng($newImg, "$toFile$newName.png", $imgQuality))
        return "$newName.png"; break;
        default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
        return "$newName.jpg"; break;
    }
    imagedestroy($newImg);
    }
    imagedestroy($img);
    return false;
}

$array = array(
    array(1,2),
    array(3,4),
    array('www.111cn.net','111cn.net')
    );
    
//看到上面二维数结构了吧，下面我们用foreach来实例

function array_2to1($array)
{
    static $result_array=array();
    foreach($array as $value)
    {
        if(is_array($value))
        {
            arrau_2to1($value);
        }
        else 
            $result_array[]=$value;
    }
    return $result_array;
}

//上面这段代码还可以简写

function _rebuild_array($arr){  //rebuild a array
  static $tmp=array();

  for($i=0; $i<count($arr); $i++){
    if(is_array($arr[$i])) _rebuild_array($arr[$i]);
    else $tmp[]=$arr[$i];
  }

  return $tmp;
}

$arr = array_2to1( $array );
foreach( $arr as $v )
{
 echo $v;
}

//现在再来看一个反一维数据保存到二维数据的实例

$arr_new=array();
$insert_key  =array('uid','hostname','shopname','province','city','county','address','www.111cn.net','qq','Mobile','msn');

$insert_value=array('2','hostname','shopname','province','city','www.111cn.net','address','shopimg','qq','Mobile','msn');
//一在我们把2个数组一一对应写到一个新的二维数组里去

foreach($insert_key as $key => $val){
$arr_new[$val]=$insert_value[$key];

}
print_r($arr_new);

//英文验证码相对简单，不要作hex处理，直接用色彩值就OK了。如果
session_start();
function rand_create()
{
    //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, 200,200,200); //RGB灰色标识符
    //开始作图    
    imagefill($im,0,0,$gray);
    while(($randval=rand()%100000)<10000);{
        $_SESSION["Auth_code"] = $randval;
        //将四位整数验证码绘入图片 
        imagestring($im, 5, 10, 3, $randval, $black);
    }
    //加入干扰象素   
    for($i=0;$i<200;$i++){
        $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
    }
    //输出验证图片
    ImagePNG($im);
    //销毁图像标识符
    ImageDestroy($im);
}
rand_create();

//调用方法<img src=www.111cn.net.php />

//中文验证码程序如下

Header("Content-type: image/PNG");
$str = "这里设置一中文如果中国WEB第一站www.111cn.net";
$imagesW = 140;
$imagesH = 40;
//
$Auimg = imagecreate($imagesW,$imagesH);
$bgc = ImageColorAllocate($Auimg,255,255,255);
$font = "heiti.ttf";//这里设置字体，你可以随便下载一款字体哦。
$white=imagecolorallocate($Auimg,234,185,95);
imagearc($Auimg, 150, 8, 20, 20, 75, 170, $white);
imagearc($Auimg, 180, 7,50, 30, 75, 175, $white);
imageline($Auimg,20,20,180,30,$white);
imageline($Auimg,20,18,170,50,$white);
imageline($Auimg,25,50,80,50,$white);
$noise_num = 800;
$line_num = 20;
imagecolorallocate($Auimg,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($Auimg,0xAA,0xAA,0xAA);
$noise_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
$font_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
$line_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
for($i=0;$i<$noise_num;$i++){
 imagesetpixel($Auimg,mt_rand(0,$imagesW),mt_rand(0,$imagesH),$noise_color);
}
for($i=0;$i<$line_num;$i++){
 imageline($Auimg,mt_rand(0,$imagesW),mt_rand(0,$imagesH),mt_rand(0,$imagesW),mt_rand(0,$imagesH),$line_color);
}
$mtRnd=rand(0,strlen($str)-4);
if($mtRnd%2)$mtRnd+=1;
$str = substr($str,$mtRnd,8);
$str = iconv("GB2312","UTF-8",$str);
ImageTTFText($Auimg, 20, 0, 16, 30, $font_color, $font, $str);
ImagePNG($Auimg);
ImageDestroy($Auimg);
/*
 共同点就是验证码都借助于其它容器来保存如session,cookie等，否则就没有验证的意义了
 本文章由www.111cn.net整，转载请注明来源谢谢合作。

 

//$pattern = "/file-([0-2]d{3})-([1-9]d?)/"; 这个正则表达式，对文件夹的月日进行捕获，再进一步判断处理 

02 for($i =2005;$i<=2009;$i++) 

03 { 

04 for($j = 1;$j<30;$j++) 

05 { 

06 $dest_dir = "text/file-".$i."-$j"; 

07 if(!is_dir($dest_dir)) mkdir($dest_dir,0777); 

08 } 

09 } 

10 //创建一些不满足条件的文件夹 

11   

12 for($t = 0;$t<10;$t++) 

13 { 

14 $dest_dir = "text/file-".$t; 

15 if(!is_dir($dest_dir)) mkdir($dest_dir,0777); 

16 } 

17   

18 //遍历文件夹处理 . 

19 function listFile($dir) 

20 {  

21 $a = array(); 

22 $handle = opendir($dir); 

23 while($file = readdir($handle)) 

24 { 

25 handle_dir($dir,$file,&$a); 

26 } 

27   

28 echo "the rege_array is "; 

29 print("<pre>"); 

30 print_r($a); 

31 print("</pre>"); 

32 } 

33   

34 function handle_dir($dir,$file,$a) 

35 { 

36   

37 if($file == "." || $file == "..") return ; 

38 $minYear = 2008; 

39 $maxDay = 13; 

40   

41 $pattern = "/file-([0-2]d{3})-([1-9]d?)/"; 

42 $destPath = $dir."/".$file; 

43   

44 if(!is_dir($destPath)) 

45 { 

46 //echo "$destPath is not a dir ;"; 

47 return; 

48 } 

49   

50 //删除不满足格式的文件 

51 if(!preg_match($pattern,$file)) 

52 { 

53 //echo "<font color=blue>$file</font><font color=red>is not the right rege. the program will unlink -- $destPath --</font><br/>"; 

54 // unlink($destPath); 

55 return; 

56 } 

57   

58 preg_match_all($pattern,$file,$matchs); 

59   

60 //echo "<font color=blue>$file</font> is the right rege"; 

61 //print_r($matchs); 

62 //echo "the year is ".$matchs[1][0]." and the day is ".$matchs[2][0]."</br>"; 

63 if(intval($matchs[1][0]) >$minYear && intval($matchs[2][0]) < $maxDay) 

64 { 

65 $a[]= $destPath; 

66 }else { //不满足条件的 

67 //unlink($destPath); 

68   

69 } 

70 } 

71   

72 listFile("text");

 

ar=array(0=>array('name'=>'食物','id'=>1,'pid'=>0), 

02               1=>array('name'=>'植物','id'=>2,'pid'=>0), 

03               3=>array('name'=>'白菜','id'=>3,'pid'=>1), 

04               4=>array('name'=>'树','id'=>4,'pid'=>2), 

05               5=>array('name'=>'苹果','id'=>5,'pid'=>3), 

06               6=>array('name'=>'松树','id'=>6,'pid'=>4), 

07               7=>array('name'=>'饮料','id'=>7,'pid'=>1), 

08               8=>array('name'=>'测试1','id'=>8,'pid'=>7), 

09               9=>array('name'=>'测试2','id'=>9,'pid'=>8), 

10               10=>array('name'=>'人民','id'=>10,'pid'=>9), 

11               11=>array('name'=>'小米','id'=>11,'pid'=>0), 

12               ); 

13   

14         echo '<table border="1" width="100%">'; 

15         tre($ar,0); 

16         echo '</table>'; 

17   

18         function tre($tree,$id) 

19         { 

20                 $str = ''; 

21                 $strid = ''; 

22                 foreach ($tree as $key => $item) 

23                 { 

24                         if ($item['pid'] == $id) { 

25                                 $i = 0; 

26                                 $i = sonNum($tree,$item['id']); 

27                                 if ($i == 1 || $i == 0) { 

28                                         echo '<tr><td>'; 

29                                 } else { 

30                                         echo '<tr><td rowspan="'.$i.'">';         

31                                 } 

32                                 //echo '<tr><td>'; 

33                                 echo $item['name']; 

34                                 echo '</td></tr>'; 

35                                 tre($tree,$item['id']); 

36                         } 

37                 } 

38                 //tre($tree,$strid); 

39         } 

40           

41         function sonNum($tre,$sum,$totale=1) 

42         { 

43                 foreach ($tre as $key => $value) 

44                 { 

45                         if ($value['pid'] == $sum){ 

46                                 $totale += sonNum($tre,$value['id'],1); 

47                         } 

48                 } 

49                 return $totale; 

50         }