php 上传图片并按比例生成指定大小图

这是一款图象缩略函数哦，把上传的新图片给$srcfile然后进行文件按$thumbwidth 缩小图宽最大尺寸 与$thumbheitht 缩小图高最大尺寸 生成小图。

图象缩略函数
参数说明：

代码如下

复制代码

$srcfile 原图地址； $dir  新图目录 $thumbwidth 缩小图宽最大尺寸 $thumbheitht 缩小图高最大尺寸 $ratio 默认等比例缩放 为1是缩小到固定尺寸。 */ function makethumb($srcfile,$dir,$thumbwidth,$thumbheight,$ratio=0) {  //判断文件是否存在 if (!file_exists($srcfile))return false;  //生成新的同名文件，但目录不同 $imgname=explode('/',$srcfile); $arrcount=count($imgname); $dstfile = $dir.$imgname[$arrcount-1]; //缩略图大小 $tow = $thumbwidth; $toh = $thumbheight; if($tow < 40) $tow = 40; if($toh < 45) $toh = 45;     //获取图片信息     $im ='';     if($data = getimagesize($srcfile)) {         if($data[2] == 1) {             $make_max = 0;//gif不处理             if(function_exists("imagecreatefromgif")) {                 $im = imagecreatefromgif($srcfile);             }         } elseif($data[2] == 2) {             if(function_exists("imagecreatefromjpeg")) {                 $im = imagecreatefromjpeg($srcfile);             }         } elseif($data[2] == 3) {             if(function_exists("imagecreatefrompng")) {                 $im = imagecreatefrompng($srcfile);             }         }     }     if(!$im) return '';     $srcw = imagesx($im);     $srch = imagesy($im);     $towh = $tow/$toh;     $srcwh = $srcw/$srch;     if($towh <= $srcwh){         $ftow = $tow;         $ftoh = $ftow*($srch/$srcw);     } else {         $ftoh = $toh;         $ftow = $ftoh*($srcw/$srch);     }     if($ratio){         $ftow = $tow;         $ftoh = $toh;     }     //缩小图片     if($srcw > $tow || $srch > $toh || $ratio) {         if(function_exists("imagecreatetruecolor") && function_exists("imagecopyresampled") && @$ni = imagecreatetruecolor($ftow, $ftoh)) {             imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftow, $ftoh, $srcw, $srch);         } elseif(function_exists("imagecreate") && function_exists("imagecopyresized") && @$ni = imagecreate($ftow, $ftoh)) {             imagecopyresized($ni, $im, 0, 0, 0, 0, $ftow, $ftoh, $srcw, $srch);         } else {             return '';         }         if(function_exists('imagejpeg')) {             imagejpeg($ni, $dstfile);         } elseif(function_exists('imagepng')) {             imagepng($ni, $dstfile);         }     }else {         //小于尺寸直接复制     copy($srcfile,$dstfile);     }     imagedestroy($im);     if(!file_exists($dstfile)) {         return '';     } else {         return $dstfile;     } }

?>

本款是一款php 读取目录下图像文件哦，代码，他利用了opendir来打开目录然后获取文件后缀名，判断是否为指定文件。

代码如下

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$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);

这是一款办外开的经典的php生成缩略图类函数，文件灵活实用，可以生成任何风格的图片，并且 可以把文本转换成图形。

copyright   : smart-info limited. all right reserved.
 author      : jacky cheung
 version     : 1.1
 create date : 24 september 2008
 last modify : 15 march 2009
*/

class gd
{
 var $font_face   = "";
 var $text   = "";
 var $size    = 12;
 var $color   = "#000000";
 var $angle   = 0;

 var $width   = 0;
 var $height   = 0;
 var $line_height = 0;
 
 var $type   = "png";
 var $chmod   = 0777;
 var $bg_color  = "#ffffff";
 var $quality  = 95;
 var $antialias  = true;
 
 var $x    = 0;
 var $y    = 0;
 

 /*___| convert text to image |___*/
  public function text2image ( $font_face="", $text="", $attributes=false, $width=0, $all=false )
  {
   $this->font_face  = $font_face;
   $this->text   = $text;
   $this->width  = $width;
   $this->size   = 12;
   $this->color  = "#000000";
   $this->angle  = 0;
   $this->line_height = 0;
   $this->setprop ( $attributes );
   
   if ( $this->width == 0 )
   {
    return $this->convert_text2image ( $this->text, $this->check_text_width( $this->text ) );
   } else {
    // word wrap
    if ( $all === false )
    {
     $text = split(" ", $this->text);
     $text = $this->word_wrap($this->text, $this->width, "<br>");
     $text = split("<br>", $text );
    } else if ( $all === true ) {
     $temp = array();
     for ( $i=0; $i<strlen($this->text); $i++ )
     {
      array_push ( $temp, mb_substr($this->text, $i, 1, "utf-8") );
     }
     $text = array();
     $count_width = 0;
     $i = 0;
     foreach ( $temp as $k => $t )
     {
      $prop = $this->check_text_width($t);
      if ( $count_width + floatval($prop["width"]) < $this->width )
      {
       $text[$i] = $text[$i] . $t;
       $count_width += floatval($prop["width"]);
      } else {
       $count_width = 0;
       $i++;
       $text[$i] = "";
      }
     }
    }
    
    $img = array();
    foreach ( $text as $k => $t )
    {
     $img[$k] = $this->convert_text2image ( $t,  $this->check_text_width( $t ) );
    }
    
    $w = 0;
    $h = 0;
    foreach ( $img as $k => $v )
    {
     $w = (imagesx($img[$k]) > $w) ? imagesx($img[$k]) : $w;

     if ($this->line_height == 0 ) $h += imagesy($img[$k]);
     else $h += ($k < count($img)-1) ? $this->line_height : imagesy($img[$k]);
    }
    
    $base_img = $this->createtransparent($w, $h);
    $locy = 0;
    foreach ( $img as $k => $v )
    {
     if ($k > 0)
     {
      $locy = ($this->line_height == 0) ? $locy + imagesy($img[$k]) : $locy + $this->line_height;
     }
     $base_img = $this->attachgdimage ( $img[$k], $base_img, array ("x"=>0, "y"=>$locy) );
    }
    return $base_img;
   }
  }
  private function word_wrap( $str, $width, $break )
  {
   $formatted = '';
   $position = -1;
   $prev_position = 0;
   $last_line = -1;
   
   /// looping the string stop at each space
   while( $position = mb_stripos( $str, " ", ++$position, 'utf-8' ) ) {
    if( $position > $last_line + $width + 1 ) {
     $formatted.= mb_substr( $str, $last_line + 1, $prev_position - $last_line - 1, 'utf-8' ).$break;
     $last_line = $prev_position;
    }
    $prev_position = $position;
   }
   
   /// adding last line without the break
   $formatted.= mb_substr( $str, $last_line + 1, mb_strlen( $str ), 'utf-8' );
   return $formatted;
  }

  public function convert_text2image ( $text, $prop )
  {
   $im   = imagecreatetruecolor ( $prop["width"], $prop["height"] );
   $rgb   = $this->getrgb ( $this->color );
   $color   = imagecolorallocate ( $im, $rgb["red"], $rgb["green"], $rgb["blue"] );
   $img   = $this->createtransparent ( $prop["width"], $prop["height"] );
   imagettftext ( $img, $this->size, $this->angle, 0, $prop["height"] - abs ( $prop["top"] ), $color, $this->font_face, $text );
   return $img;
  }
  public function check_text_width ( $text )
  {
   $prop = array();
   $bbox    = imagettfbbox ( $this->size, $this->angle, $this->font_face, $text );
   $prop["left"]  = $bbox[0];
   $prop["right"]  = $bbox[2];
   $prop["top"] = $bbox[1];
   $prop["bottom"] = $bbox[7];
   $padding  = 2;
  
   $prop["width"]  = abs($prop["left"]) + abs($prop["right"])  + $padding;
   $prop["height"] = abs($prop["top"])  + abs($prop["bottom"]) + $padding;
   
   return $prop;
  }

 /*___| save to image file |___*/
  public function save($gdimage, $filename, $attributes=false)
  {
   $this->type   = "png";
   $this->chmod   = 0777;
   $this->bg_color  = "#ffffff";
   $this->quality  = 95;
   $this->antialias = true;
   
   $this->setprop ( $attributes );
   
   // process
   switch ( strtolower ( $this->type ) )
   {
    case "jpeg":
    case "jpg":
     $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
     imagejpeg ( $gdimage, $filename, $this->quality );
     break;
    case "gif":
     $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
     imagegif ( $gdimage, $filename );
     break;   
    case "png":
    default :
     imagepng ( $gdimage, $filename );
     break;
   }
   chmod ( $filename, $this->chmod );
  }

 /*___| create gd background image |___*/
  public function createbackground($gdimage, $width, $height)
  {
   $img = imagecreatetruecolor ( $width, $height );
   $rgb = $this->getrgb ( $this->bg_color );
   $color = imagecolorallocate ( $img, $rgb["red"], $rgb["green"], $rgb["blue"] );
   imagefill ( $img, 0, 0, $color );
   imagecopyresampled ( $img, $gdimage, 0, 0, 0, 0, $width, $height, $width, $height );
   return $img;
  }

 /*___| create gd transparent image |___*/
  public function createtransparent($width, $height)
  {
   $img = imagecreatetruecolor($width, $height);
   imagealphablending($img, false);
   imagesavealpha($img, true);
   $transparent = imagecolorallocatealpha($img, 0, 0, 0, 127);
   imagefilledrectangle($img, 0, 0, $width, $height, $transparent);
   imagecopyresampled($img, $img, 0, 0, 0, 0, $width, $height, $width, $height);
   return $img;
  }

 
 /*___| load image |___*/
  public function createimagefrom($filename, $alpha=true)
  {
   if ( function_exists ( "exif_imagetype" ) )
   {
    if ( exif_imagetype ( $filename )   == imagetype_jpeg ) { return $this->createfromjpeg ( $filename ); }
    else if ( exif_imagetype ( $filename )  == imagetype_gif  ) { return $this->createfromgif  ( $filename ); }
    else if ( exif_imagetype ( $filename )  == imagetype_png  ) { return $this->createfrompng  ( $filename, $alpha ); }
   }
   else
   {
    if ( strstr ( strtoupper ( $filename )  , ".jpg" )  || strstr ( strtoupper ( $filename ), ".jpeg" )) { return $this->createfromjpeg ( $filename ); }
    else if ( strstr ( strtoupper ( $filename ) , ".gif" )) { return $this->createfromgif ( $filename ); }
    else if ( strstr ( strtoupper ( $filename ) , ".png" )) { return $this->createfrompng ( $filename, $alpha ); }
   }
   return false;
  }
  private function createfromjpeg ( $filename ) { return imagecreatefromjpeg ( $filename ); }
  private function createfromgif  ( $filename ) { return imagecreatefromgif  ( $filename ); }
  private function createfrompng  ( $filename, $alpha=true )
  {
   if ( $alpha )
   {
    list ( $width, $height ) = getimagesize ( $filename );
    $png_img = imagecreatefrompng ( $filename );
    $img = imagecreatetruecolor ( $width, $height );
    imagealphablending ( $img, false );
    imagesavealpha ( $img, true );
    imagecopyresampled ( $img, $png_img, 0, 0, 0, 0, $width, $height, $width, $height );
   } else {
    $img = imagecreatefrompng ( $filename );
   } 
   return $img;
  }
 
 
 /*___| attach background image |___*/
  public function attachbackgroundimage ( $gdimage, $filename, $attributes=false )
  {
   $this->x = 0;
   $this->y = 0;
   $this->setprop ( $attributes );
  
   $img = $this->createimagefrom ( $filename );
   imagecopyresampled ( $img, $gdimage, $this->x, $this->y, 0, 0, imagesx($gdimage), imagesy($gdimage), imagesx($gdimage), imagesy($gdimage) );
   return $img;
  }

 /*___| attach image |___*/
  public function attachimage ( $source, $target, $filename, $image_attributes=false, $attributes=false )
  {
   $source_img = $this->createimagefrom ( $source );
   $target_img = $this->attachbackgroundimage ( $source_img, $target, $attributes );
   $this->save ( $target_img, $filename, $image_attributes );
  }
  
 
 /*___| attach gd image resource |___*/
  public function attachgdimage ( $gd_source, $gd_target, $attributes=false )
  {
   $this->x  = 0;
   $this->y  = 0;
   $this->width = 0;
   $this->height = 0;
   $this->setprop ( $attributes );
   
   imagealphablending($gd_target, true );
   imagealphablending($gd_source, true );
   imagecopy ( $gd_target, $gd_source, $this->x, $this->y, 0, 0, imagesx($gd_source), imagesy($gd_source) );
   return $gd_target;
  }
 
 
 /*___| get rgb color |___*/
  public function getrgb($hex)
  {
   $rgb["red"]   = hexdec ( substr ( $hex, 1, 2 ) ) ;
   $rgb["green"] = hexdec ( substr ( $hex, 3, 2 ) ) ;
   $rgb["blue"]  = hexdec ( substr ( $hex, 5, 2 ) ) ;
   return $rgb;
  }
 
 
 /*___| set properties |___*/ 
  private function setprop ( $attributes=false )
  {
   if ( $attributes ) { foreach  ( $attributes as $key => $value ) { $k = strtoupper ( $key ); $this->$k = $value; } }
  }
}

//调用 方法

代码如下	复制代码
$imgresize = new imagetransform(); $imgresize->sourcefile = $source.$file; $imgresize->targetfile = $destination.$file; $imgresize->chmodvalue = 0777;  $imgresize->resizetowidth = $tw; $imgresize->resizetoheight = $th; $imgresize->jpegoutputquality = 100; $imgresize->resizeifsmaller = false; $imgresize->resize();

?>

本文章收藏了四款关于利用php 等比例缩小图片代码函数，我们可定义图片宽度或高度对图片缩小或放大的图片宽度哦，好了看看四款实例那一款适合于你吧。

代码如下

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function imageresize2($width, $height, $targetw, $targeth) {   $percentage = 1;   if (($width > $targetw) || ($height > $targeth))   {  $width_diff = $width - $targetw;  $height_diff = $height - $targeth;    if ($width_diff >= $height_diff)  {   $percentage = ($targetw / $width);  }  else  {   $percentage = ($targeth / $height);  }   }  //gets the new value and applies the percentage, then rounds the value  $width = round($width * $percentage);  $height = round($height * $percentage);  $resize[0] = $width;  $resize[1] = $height;  return $resize; } //方法二 if (!$max_width)     $max_width = 240;   if (!$max_height)     $max_height = 200;     $size = getimagesize($image);   $width = $size[0];   $height = $size[1];     $x_ratio = $max_width / $width;   $y_ratio = $max_height / $height;     if ( ($width <= $max_width) && ($height <= $max_height) ) {     $tn_width = $width;     $tn_height = $height;   }   else if (($x_ratio * $height) < $max_height) {     $tn_height = ceil($x_ratio * $height);     $tn_width = $max_width;   }   else {     $tn_width = ceil($y_ratio * $width);     $tn_height = $max_height;   }     $src = imagecreatefrompng($image);   $dst = imagecreate($tn_width,$tn_height);   imagecopyresized($dst, $src, 0, 0, 0, 0,       $tn_width,$tn_height,$width,$height);   header("content-type: image/png");   imagepng($dst, null, -1);   imagedestroy($src);   imagedestroy($dst);   //方法三 /* 函数原型如下： 参数说明： $oldwidth:原图片宽度 $oldheight:原图片高度 $imgwidth:缩小或放大的图片宽度 $imgheight:缩小或放大的图片高度 返回：wwww.111cn.net 数组：arraysize ,其中索引为：width 和height 即：arraysize['width']、arraysize['height'] */ function getimgsize($oldwidth,$oldheight,$imgwidth,$imgheight) { //$oldwidth设置的宽度，$oldheight设置的高度，$imgwidth图片的宽度，$imgheight图片的高度； //单元格装得能装得进图片，则按图片的真实大小显示； if($imgwidth<=$oldwidth&&$imgheight<=$oldheight) { $arraysize=array('width'=>$imgwidth,'height'=>$imgheight); return $arraysize; } else { $suoxiaowidth=$imgwidth-$oldwidth; $suoxiaoheight=$imgheight-$oldheight; $suoxiaoheightper=$suoxiaoheight/$imgheight; $suoxiaowidthper=$suoxiaowidth/$imgwidth; if($suoxiaoheightper>=$suoxiaowidthper) { //单元格高度为准； $aftersuoxiaowidth=$imgwidth*(1-$suoxiaoheightper); $arraysize=array('width'=>$aftersuoxiaowidth,'height'=>$oldheight); return $arraysize; } else { //单元格宽度为准； $aftersuoxiaoheight=$imgheight*(1-$suoxiaowidthper); $arraysize=array('width'=>$oldwidth,'height'=>$aftersuoxiaoheight); return $arraysize; } } }

?>

代码如下

复制代码

//adv0.jpg就是背景图片,注意函数与图片格式对应   $im = imagecreatefromjpeg('/www/law/images/demo/adv0.jpg');    $font_color = imagecolorallocate ($im, 0, 250, 10); //这是文字颜色，绿色     $text = "张三的博客";                               //文字内容     $font_file = "/www/font/hyi_xkj.ttf";               //字体的linux绝对路径     //26：字体， 0 是角度， 10，36是坐标， $font_color是文字色， font是字体，  文本是填入的文字   imagettftext($im, 26,0, 10, 36, $font_color ,$font_file, $text);  往图片插入文字     // output image   header ('content-type: image/png');                 //即便是从jpg拷贝的图片，也能以png输出，   imagepng ($im);   // clean up   imagedestroy($im);

生成水印方法二

代码如下

复制代码

public final class imageutils { public imageutils() { } public final static string getpressimgpath(){ return applicationcontext.getrealpath("/template/data/util/shuiyin.gif"); } /** * 把图片印刷到图片上 * @param pressimg -- 水印文件 * @param targetimg -- 目标文件 * @param x * @param y */ public final static void pressimage(string pressimg, string targetimg, int x, int y) { try { file _file = new file(targetimg); image src = imageio.read(_file); int wideth = src.getwidth(null); int height = src.getheight(null); bufferedimage image = new bufferedimage(wideth, height, bufferedimage.type_int_rgb); graphics g = image.creategraphics(); g.drawimage(src, 0, 0, wideth, height, null); // 水印文件 file _filebiao = new file(pressimg); image src_biao = imageio.read(_filebiao); int wideth_biao = src_biao.getwidth(null); int height_biao = src_biao.getheight(null); g.drawimage(src_biao, wideth - wideth_biao - x, height - height_biao -y, wideth_biao, height_biao, null); // / g.dispose(); fileoutputstream out = new fileoutputstream(targetimg); jpegimageencoder encoder = jpegcodec.createjpegencoder(out); encoder.encode(image); out.close(); } catch (exception e) { e.printstacktrace(); } } /** * 打印文字水印图片 * @param presstext --文字 * @param targetimg -- 目标图片 * @param fontname -- 字体名 * @param fontstyle -- 字体样式 * @param color -- 字体颜色 * @param fontsize -- 字体大小 * @param x -- 偏移量 * @param y */ public static void presstext(string presstext, string targetimg, string fontname,int fontstyle, int color, int fontsize, int x, int y) { try { file _file = new file(targetimg); image src = imageio.read(_file); int wideth = src.getwidth(null); int height = src.getheight(null); bufferedimage image = new bufferedimage(wideth, height, bufferedimage.type_int_rgb); graphics g = image.creategraphics(); g.drawimage(src, 0, 0, wideth, height, null); // string s=www.111cn.net; g.setcolor(color.red); g.setfont(new font(fontname, fontstyle, fontsize)); g.drawstring(presstext, wideth - fontsize - x, height - fontsize/2 - y); g.dispose(); fileoutputstream out = new fileoutputstream(targetimg); jpegimageencoder encoder = jpegcodec.createjpegencoder(out); encoder.encode(image); out.close(); } catch (exception e) { system.out.println(e); } } public static void main(string[] args) { pressimage("c:/shuiyin/shuiyin.gif", "c:/shuiyin/dsc02342.jpg", 20 ,20); } }