常用的php图片处理类（水印、等比缩放、固定高宽）分享


            常用的php图片处理类（水印、等比缩放、固定高宽）分享





<?php  

//PHP 添加水印 & 比例缩略图 & 固定高度 & 固定宽度 类。 

class Image_process{ 

  public $source; //原图 

  public $source_width;  //原图宽度 

  public $source_height; //原图高度 

  public $source_type_id; 

  public $orign_name; 

  public $orign_dirname; 

    

  //传入原图路径 

  public function __construct($source){ 

    $this->typeList = array(1=>'gif',2=>'jpg',3=>'png'); 

    $ginfo = getimagesize($source); 

    $this->source_width = $ginfo[0]; 

    $this->source_height = $ginfo[1]; 

    $this->source_type_id = $ginfo[2]; 

    $this->orign_url = $source; 

    $this->orign_name = basename($source); 

    $this->orign_dirname = dirname($source); 

  } 

    

  //判断图片的文件的格式，返回PHP可识别的编码 

  public function judgeType($type,$source){ 

    if($type == 1){ 

      return imagecreatefromgif($source); //gif 

    }else if($type == 2){ 

      return imagecreatefromjpeg($source); //jpg 

    }else if($type == 3){ 

      return imagecreatefrompng($source); //png 

    }else{ 

      return false; 

    } 

  } 

    

  //生成水印图片 

  public function waterMakeImage($logo){ 

    $linfo = getimagesize($logo); 

    $logo_width = $linfo[0]; 

    $logo_height = $linfo[1]; 

    $logo_type_id = $linfo[2]; 

    $sourceHandle = $this->judgeType($this->source_type_id,$this->orign_url); 

    $logoHandle = $this->judgeType($logo_type_id,$logo); 

    if(!$sourceHandle || !$logoHandle){ 

      return false; 

    } 

    $x = ($this->source_width - $logo_width)/2; 

    $y = ($this->source_height - $logo_height)/2; 

    imagecopy($sourceHandle,$logoHandle,$x,$y,0,0,$logo_width,$logo_height); 

    $newPic = $this->orign_dirname.'\water_'.time().'.'.$this->typeList[$this->source_type_id]; 

    if($this->saveImage($sourceHandle,$newPic)){ 

      imagedestroy($sourceHandle); 

      imagedestroy($logoHandle); 

    } 

  } 

    

  //固定高度宽度 

  public function fixSizeImage($width,$height){ 

    if($width > $this->source_width) $this->source_width; 

    if($height > $this->source_height) $this->source_height; 

    if($width === false){ 

      $width = floor($this->source_width / ($this->source_height / $height)); 

    } 

    if($height === false){ 

      $height = floor($this->source_height / ($this->source_width / $width)); 

    } 

    $this->tinyImage($width,$height); 

  } 

    

  //等比例缩放图片 

  public function scaleImage($scale){ 

    $width = floor($this->source_width * $scale); 

    $height = floor($this->source_height * $scale); 

    $this->tinyImage($width, $height); 

  } 

    

  //创建缩略图 

  public function tinyImage($width,$height){ 

    $tinyImage = imagecreatetruecolor($width,$height); 

    $handle = $this->judgeType($this->source_type_id,$this->orign_url); 

    if(function_exists('imagecopyresampled')){ 

      imagecopyresampled($tinyImage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height); 

    }else{ 

      imagecopyresized($tinyImage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height); 

    } 

    $newPic = $this->orign_dirname.'\thumb_'.time().'_'.$width."_".$height.".".$this->typeList[$this->source_type_id]; 

    if($this->saveImage($tinyImage,$newPic)){ 

      imagedestroy($tinyImage); 

      imagedestroy($handle); 

    } 

  } 

  //保存图片 

  private function saveImage($image,$url){ 

    if(imagejpeg($image,$url)){ 

      return true; 

    } 

  } 

} 

$imgHandle = new Image_process('D:\AppServ\www\test\getimg\14061907445601.jpg'); 

//$imgHandle->waterMakeImage('D:\AppServ\www\test\getimg\shougongke.png');  //生成水印图片 

//$imgHandle->fixSizeImage(200,150); //固定长度图片 

$imgHandle->scaleImage(0.2); //等比例缩放 

?>





示例二：





<?php

/**

 * 

 * 图像处理类

 * @author FC_LAMP

 * @internal功能包含：水印,缩略图

 */

class Img

{

 //图片格式

 private $exts = array ('jpg', 'jpeg', 'gif', 'bmp', 'png' );



 /**

 * 

 * 

 * @throws Exception

 */

 public function __construct()

 {

 if (! function_exists ( 'gd_info' ))

 {

  throw new Exception ( '加载GD库失败！' );

 }

 }



 /**

 * 

 * 裁剪压缩

 * @param $src_img 图片

 * @param $save_img 生成后的图片

 * @param $option 参数选项，包括： $maxwidth 宽 $maxheight 高

 * array('width'=>xx,'height'=>xxx)

 * @internal

 * 我们一般的压缩图片方法，在图片过长或过宽时生成的图片

 * 都会被“压扁”，针对这个应采用先裁剪后按比例压缩的方法

 */

 public function thumb_img($src_img, $save_img = '', $option)

 {



 if (empty ( $option ['width'] ) or empty ( $option ['height'] ))

 {

  return array ('flag' => False, 'msg' => '原图长度与宽度不能小于0' );

 }

 $org_ext = $this->is_img ( $src_img );

 if (! $org_ext ['flag'])

 {

  return $org_ext;

 }



 //如果有保存路径，则确定路径是否正确

 if (! empty ( $save_img ))

 {

  $f = $this->check_dir ( $save_img );

  if (! $f ['flag'])

  {

  return $f;

  }

 }



 //获取出相应的方法

 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] );



 //获取原大小

 $source = $org_funcs ['create_func'] ( $src_img );

 $src_w = imagesx ( $source );

 $src_h = imagesy ( $source );



 //调整原始图像(保持图片原形状裁剪图像)

 $dst_scale = $option ['height'] / $option ['width']; //目标图像长宽比

 $src_scale = $src_h / $src_w; // 原图长宽比

 if ($src_scale >= $dst_scale)

 { // 过高

  $w = intval ( $src_w );

  $h = intval ( $dst_scale * $w );



  $x = 0;

  $y = ($src_h - $h) / 3;

 } else

 { // 过宽

  $h = intval ( $src_h );

  $w = intval ( $h / $dst_scale );



  $x = ($src_w - $w) / 2;

  $y = 0;

 }

 // 剪裁

 $croped = imagecreatetruecolor ( $w, $h );

 imagecopy ( $croped, $source, 0, 0, $x, $y, $src_w, $src_h );

 // 缩放

 $scale = $option ['width'] / $w;

 $target = imagecreatetruecolor ( $option ['width'], $option ['height'] );

 $final_w = intval ( $w * $scale );

 $final_h = intval ( $h * $scale );

 imagecopyresampled ( $target, $croped, 0, 0, 0, 0, $final_w, $final_h, $w, $h );

 imagedestroy ( $croped );



 //输出(保存)图片

 if (! empty ( $save_img ))

 {



  $org_funcs ['save_func'] ( $target, $save_img );

 } else

 {

  header ( $org_funcs ['header'] );

  $org_funcs ['save_func'] ( $target );

 }

 imagedestroy ( $target );

 return array ('flag' => True, 'msg' => '' );

 }



 /**

 * 

 * 等比例缩放图像

 * @param $src_img 原图片

 * @param $save_img 需要保存的地方

 * @param $option 参数设置 array('width'=>xx,'height'=>xxx)

 * 

 */

 function resize_image($src_img, $save_img = '', $option)

 {

 $org_ext = $this->is_img ( $src_img );

 if (! $org_ext ['flag'])

 {

  return $org_ext;

 }



 //如果有保存路径，则确定路径是否正确

 if (! empty ( $save_img ))

 {

  $f = $this->check_dir ( $save_img );

  if (! $f ['flag'])

  {

  return $f;

  }

 }



 //获取出相应的方法

 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] );



 //获取原大小

 $source = $org_funcs ['create_func'] ( $src_img );

 $src_w = imagesx ( $source );

 $src_h = imagesy ( $source );



 if (($option ['width'] && $src_w > $option ['width']) || ($option ['height'] && $src_h > $option ['height']))

 {

  if ($option ['width'] && $src_w > $option ['width'])

  {

  $widthratio = $option ['width'] / $src_w;

  $resizewidth_tag = true;

  }



  if ($option ['height'] && $src_h > $option ['height'])

  {

  $heightratio = $option ['height'] / $src_h;

  $resizeheight_tag = true;

  }



  if ($resizewidth_tag && $resizeheight_tag)

  {

  if ($widthratio < $heightratio)

   $ratio = $widthratio;

  else

   $ratio = $heightratio;

  }



  if ($resizewidth_tag && ! $resizeheight_tag)

  $ratio = $widthratio;

  if ($resizeheight_tag && ! $resizewidth_tag)

  $ratio = $heightratio;



  $newwidth = $src_w * $ratio;

  $newheight = $src_h * $ratio;



  if (function_exists ( "imagecopyresampled" ))

  {

  $newim = imagecreatetruecolor ( $newwidth, $newheight );

  imagecopyresampled ( $newim, $source, 0, 0, 0, 0, $newwidth, $newheight, $src_w, $src_h );

  } else

  {

  $newim = imagecreate ( $newwidth, $newheight );

  imagecopyresized ( $newim, $source, 0, 0, 0, 0, $newwidth, $newheight, $src_w, $src_h );

  }

 }

 //输出(保存)图片

 if (! empty ( $save_img ))

 {



  $org_funcs ['save_func'] ( $newim, $save_img );

 } else

 {

  header ( $org_funcs ['header'] );

  $org_funcs ['save_func'] ( $newim );

 }

 imagedestroy ( $newim );

 return array ('flag' => True, 'msg' => '' );

 }



 /**

 * 

 * 生成水印图片

 * @param $org_img 原图像

 * @param $mark_img 水印标记图像

 * @param $save_img 当其目录不存在时，会试着创建目录

 * @param array $option 为水印的一些基本设置包含：

 * x:水印的水平位置,默认为减去水印图宽度后的值

 * y:水印的垂直位置,默认为减去水印图高度后的值

 * alpha:alpha值(控制透明度),默认为50

 */

 public function water_mark($org_img, $mark_img, $save_img = '', $option = array())

 {

 //检查图片

 $org_ext = $this->is_img ( $org_img );

 if (! $org_ext ['flag'])

 {

  return $org_ext;

 }

 $mark_ext = $this->is_img ( $mark_img );

 if (! $mark_ext ['flag'])

 {

  return $mark_ext;

 }

 //如果有保存路径，则确定路径是否正确

 if (! empty ( $save_img ))

 {

  $f = $this->check_dir ( $save_img );

  if (! $f ['flag'])

  {

  return $f;

  }

 }



 //获取相应画布

 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] );

 $org_img_im = $org_funcs ['create_func'] ( $org_img );



 $mark_funcs = $this->get_img_funcs ( $mark_ext ['msg'] );

 $mark_img_im = $mark_funcs ['create_func'] ( $mark_img );



 //拷贝水印图片坐标

 $mark_img_im_x = 0;

 $mark_img_im_y = 0;

 //拷贝水印图片高宽

 $mark_img_w = imagesx ( $mark_img_im );

 $mark_img_h = imagesy ( $mark_img_im );



 $org_img_w = imagesx ( $org_img_im );

 $org_img_h = imagesx ( $org_img_im );



 //合成生成点坐标

 $x = $org_img_w - $mark_img_w;

 $org_img_im_x = isset ( $option ['x'] ) ? $option ['x'] : $x;

 $org_img_im_x = ($org_img_im_x > $org_img_w or $org_img_im_x < 0) ? $x : $org_img_im_x;

 $y = $org_img_h - $mark_img_h;

 $org_img_im_y = isset ( $option ['y'] ) ? $option ['y'] : $y;

 $org_img_im_y = ($org_img_im_y > $org_img_h or $org_img_im_y < 0) ? $y : $org_img_im_y;



 //alpha

 $alpha = isset ( $option ['alpha'] ) ? $option ['alpha'] : 50;

 $alpha = ($alpha > 100 or $alpha < 0) ? 50 : $alpha;



 //合并图片

 imagecopymerge ( $org_img_im, $mark_img_im, $org_img_im_x, $org_img_im_y, $mark_img_im_x, $mark_img_im_y, $mark_img_w, $mark_img_h, $alpha );



 //输出(保存)图片

 if (! empty ( $save_img ))

 {



  $org_funcs ['save_func'] ( $org_img_im, $save_img );

 } else

 {

  header ( $org_funcs ['header'] );

  $org_funcs ['save_func'] ( $org_img_im );

 }

 //销毁画布

 imagedestroy ( $org_img_im );

 imagedestroy ( $mark_img_im );

 return array ('flag' => True, 'msg' => '' );



 }



 /**

 * 

 * 检查图片

 * @param unknown_type $img_path

 * @return array('flag'=>true/false,'msg'=>ext/错误信息) 

 */

 private function is_img($img_path)

 {

 if (! file_exists ( $img_path ))

 {

  return array ('flag' => False, 'msg' => "加载图片 $img_path 失败！" );

 }

 $ext = explode ( '.', $img_path );

 $ext = strtolower ( end ( $ext ) );

 if (! in_array ( $ext, $this->exts ))

 {

  return array ('flag' => False, 'msg' => "图片 $img_path 格式不正确！" );

 }

 return array ('flag' => True, 'msg' => $ext );

 }



 /**

 * 

 * 返回正确的图片函数

 * @param unknown_type $ext

 */

 private function get_img_funcs($ext)

 {

 //选择

 switch ($ext)

 {

  case 'jpg' :

  $header = 'Content-Type:image/jpeg';

  $createfunc = 'imagecreatefromjpeg';

  $savefunc = 'imagejpeg';

  break;

  case 'jpeg' :

  $header = 'Content-Type:image/jpeg';

  $createfunc = 'imagecreatefromjpeg';

  $savefunc = 'imagejpeg';

  break;

  case 'gif' :

  $header = 'Content-Type:image/gif';

  $createfunc = 'imagecreatefromgif';

  $savefunc = 'imagegif';

  break;

  case 'bmp' :

  $header = 'Content-Type:image/bmp';

  $createfunc = 'imagecreatefrombmp';

  $savefunc = 'imagebmp';

  break;

  default :

  $header = 'Content-Type:image/png';

  $createfunc = 'imagecreatefrompng';

  $savefunc = 'imagepng';

 }

 return array ('save_func' => $savefunc, 'create_func' => $createfunc, 'header' => $header );

 }



 /**

 * 

 * 检查并试着创建目录

 * @param $save_img

 */

 private function check_dir($save_img)

 {

 $dir = dirname ( $save_img );

 if (! is_dir ( $dir ))

 {

  if (! mkdir ( $dir, 0777, true ))

  {

  return array ('flag' => False, 'msg' => "图片保存目录 $dir 无法创建！" );

  }

 }

 return array ('flag' => True, 'msg' => '' );

 }

}



if (! empty ( $_FILES ['test'] ['tmp_name'] ))

{

 //例子

 $img = new Img ();

 //原图

 $name = explode ( '.', $_FILES ['test'] ['name'] );

 $org_img = 'D:/test.' . end ( $name );

 move_uploaded_file ( $_FILES ['test'] ['tmp_name'], $org_img );

 $option = array ('width' => $_POST ['width'], 'height' => $_POST ['height'] );

 if ($_POST ['type'] == 1)

 {

 $s = $img->resize_image ( $org_img, '', $option );

 } else

 {

 $img->thumb_img ( $org_img, '', $option );

 }

 unlink ( $org_img );

}





以上所述就是本文的全部内容了，希望大家能够喜欢。