<?php 。

  。

define ( 'MAX_IMG_SIZE', 100000 ),

// Supported image types define ( 'THUMB_JPEG', 'image/jpeg' ); define ( 'THUMB_PNG', 'image/png' ); define ( 'THUMB_GIF', 'image/gif' ),

// Interlacing modes define ( 'INTERLACE_OFF', 0 ); define ( 'INTERLACE_ON', 1 ),

// Output modes define ( 'STDOUT', '' ),

// Empty constants define ( 'NO_LOGO', '' ); define ( 'NO_LABEL', '' ),

// Logo and label positioning define ( 'POS_LEFT', 0 ); define ( 'POS_RIGHT', 1 ); define ( 'POS_CENTER', 2 ); define ( 'POS_TOP', 3 ); define ( 'POS_BOTTOM', 4 ),

// Error messages define ( 'E_001', 'File <b>%s</b> do not exist' ); define ( 'E_002', 'Failed reading image data from <b>%s</b>' ); define ( 'E_003', 'Cannot create the copy of <b>%s</b>' ); define ( 'E_004', 'Cannot copy the logo image' ); define ( 'E_005', 'Cannot create final image' ),

// **************************************************************************** // CLASS DEFINITION // **************************************************************************** 。

class ThumbnailImage { 。

// **************************************************************************** // PUBLIC PROPERTIES // **************************************************************************** 。

  var $src_file;  // source image file   var $dest_file; // destination image file   var $dest_type;  // destination image type 。

  var $interlace; // destination image interlacing mode   var $jpeg_quality; // quality of resulting JPEG 。

  var $max_width; // maximal thumbnail width   var $max_height; // maximal thumbnail height   var $fit_to_max; // enlarge small images？

  var $logo; // array of logo parameters   var $label; // array of label parameters 。

// **************************************************************************** // CLASS CONSTRUCTOR // **************************************************************************** 。

  /*     Description:       Defines default values for properties.     Prototype:       void ThumbImg ( string src_file = '' )     Parameters:       src_file - source image filename   */   function ThumbnailImage ( $src_file = '' )   { 。

    $this->src_file = $src_file;     $this->dest_file = STDOUT;     $this->dest_type = THUMB_JPEG,

    $this->interlace = INTERLACE_OFF;     $this->jpeg_quality = -1,

    $this->max_width = 100;     $this->max_height = 90;     $this->fit_to_max = FALSE,

    $this->logo['file'] = NO_LOGO;     $this->logo['vert_pos'] = POS_TOP;     $this->logo['horz_pos'] = POS_LEFT,

    $this->label['text'] = NO_LABEL;     $this->label['vert_pos'] = POS_BOTTOM;     $this->label['horz_pos'] = POS_RIGHT;     $this->label['font'] = '';     $this->label['size'] = 20;     $this->label['color'] = '#000000';     $this->label['angle'] = 0,

  } 。

// **************************************************************************** // PRIVATE METHODS // **************************************************************************** 。

  /*     Description:       Extracts decimal color components from hex color string.     Prototype:       array ParseColor ( string hex_color )     Parameters:       hex_color - color in '#rrggbb' format     Return:       Decimal values for red, green and blue color components.   */   function ParseColor ( $hex_color )   { 。

    if ( strpos ( $hex_color, '#' ) === 0 )       $hex_color = substr ( $hex_color, 1 ),

    $r = hexdec ( substr ( $hex_color, 0, 2 ) );     $g = hexdec ( substr ( $hex_color, 2, 2 ) );     $b = hexdec ( substr ( $hex_color, 4, 2 ) ),

    return array ( $r, $g, $b ),

  } 。

  /*     Description:       Retrives image data as a string.       Thanks to Luis Larrateguy for the idea of this function.     Prototype:       string GetImageStr ( string image_file )     Parameters:       image_file - filename of image     Return:       Image file contents string.   */   function GetImageStr ( $image_file )   { 。

    if ( function_exists ( 'file_get_contents' ) )     {       $str = @file_get_contents ( $image_file );       if ( ! $str )       {         $err = sprintf( E_002, $image_file );         trigger_error( $err, E_USER_ERROR );       }       return $str;     } 。

    $f = fopen ( $image_file, 'rb' );     if ( ! $f )     {       $err = sprintf( E_002, $image_file );       trigger_error( $err, E_USER_ERROR );     }     $fsz = @filesize ( $image_file );     if ( ! $fsz )       $fsz = MAX_IMG_SIZE;     $str = fread ( $f, $fsz );     fclose ( $f ),

    return $str,

  } 。

  /*     Description:       Loads image from file.     Prototype:       resource LoadImage ( string image_file, int &image_width, int &image_height )     Parameters:       image_file - filename of image       image_width - width of loaded image       image_height - height of loaded image     Return:       Image identifier representing the image obtained from the given file.   */   function LoadImage ( $image_file, &$image_width, &$image_height )   { 。

    $image_width = 0;     $image_height = 0,

    $image_data = $this->GetImageStr( $image_file ),

    $image = imagecreatefromstring ( $image_data );     if ( ! $image )     {       $err = sprintf( E_003, $image_file );       trigger_error( $err, E_USER_ERROR );     } 。

    $image_width = imagesx ( $image );     $image_height = imagesy ( $image ),

    return $image,

  } 。

  /*     Description:       Calculates thumbnail image sizes from source image width and height.     Prototype:       array GetThumbSize ( int src_width, int src_height )     Parameters:       src_width - width of source image       src_height - height of source image     Return:       An array with 2 elements. Index 0 contains the width of thumbnail image       and index 1 contains the height.   */   function GetThumbSize ( $src_width, $src_height )   { 。

    $max_width = $this->max_width;     $max_height = $this->max_height,

    $x_ratio = $max_width / $src_width;     $y_ratio = $max_height / $src_height,

    $is_small = ( $src_width <= $max_width && $src_height <= $max_height ),

    if ( ! $this->fit_to_max && $is_small )     {       $dest_width = $src_width;       $dest_height = $src_height;     }     elseif ( $x_ratio * $src_height < $max_height )     {       $dest_width = $max_width;       $dest_height = ceil ( $x_ratio * $src_height );     }     else     {       $dest_width = ceil ( $y_ratio * $src_width );       $dest_height = $max_height;     } 。

    return array ( $dest_width, $dest_height ),

  } 。

  /*     Description:       Adds logo image to thumbnail.     Prototype:       void AddLogo ( int thumb_width, int thumb_height, resource &thumb_img )     Parameters:       thumb_width - width of thumbnail image       thumb_height - height of thumbnail image       thumb_img - thumbnail image identifier   */   function AddLogo ( $thumb_width, $thumb_height, &$thumb_img )   { 。

    extract ( $this->logo ),

    $logo_image = $this->LoadImage ( $file, $logo_width, $logo_height ),

    if ( $vert_pos == POS_CENTER )       $y_pos = ceil ( $thumb_height / 2 - $logo_height / 2 );     elseif ($vert_pos == POS_BOTTOM)       $y_pos = $thumb_height - $logo_height;     else       $y_pos = 0,

    if ( $horz_pos == POS_CENTER )       $x_pos = ceil ( $thumb_width / 2 - $logo_width / 2 );     elseif ( $horz_pos == POS_RIGHT )       $x_pos = $thumb_width - $logo_width;     else       $x_pos = 0,

    if ( ! imagecopy ( $thumb_img, $logo_image, $x_pos, $y_pos, 0, 0,       $logo_width, $logo_height ) )       trigger_error( E_004, E_USER_ERROR ),

  } 。

  /*     Description:       Adds label text to thumbnail.     Prototype:       void AddLabel ( int thumb_width, int thumb_height, resource &thumb_img )     Parameters:       thumb_width - width of thumbnail image       thumb_height - height of thumbnail image       thumb_img - thumbnail image identifier   */   function AddLabel ( $thumb_width, $thumb_height, &$thumb_img )   { 。

    extract ( $this->label ),

    list( $r, $g, $b ) = $this->ParseColor ( $color );     $color_id = imagecolorallocate ( $thumb_img, $r, $g, $b ),

    $text_box = imagettfbbox ( $size, $angle, $font, $text );     $text_width = $text_box [ 2 ] - $text_box [ 0 ];     $text_height = abs ( $text_box [ 1 ] - $text_box [ 7 ] ),

    if ( $vert_pos == POS_TOP )       $y_pos = 5 + $text_height;     elseif ( $vert_pos == POS_CENTER )       $y_pos = ceil( $thumb_height / 2 - $text_height / 2 );     elseif ( $vert_pos == POS_BOTTOM )       $y_pos = $thumb_height - $text_height,

    if ( $horz_pos == POS_LEFT )       $x_pos = 5;     elseif ( $horz_pos == POS_CENTER )       $x_pos = ceil( $thumb_width / 2 - $text_width / 2 );     elseif ( $horz_pos == POS_RIGHT )       $x_pos = $thumb_width - $text_width -5,

    imagettftext ( $thumb_img, $size, $angle, $x_pos, $y_pos,       $color_id, $font, $text ),

  } 。

  /*     Description:       Output thumbnail image into the browser.     Prototype:       void OutputThumbImage ( resource dest_image )     Parameters:       dest_img - thumbnail image identifier   */   function OutputThumbImage ( $dest_image )   { 。

    imageinterlace ( $dest_image, $this->interlace ),

    header ( 'Content-type: ' . $this->dest_type ),

    if ( $this->dest_type == THUMB_JPEG )       imagejpeg ( $dest_image, '', $this->jpeg_quality );     elseif ( $this->dest_type == THUMB_GIF )       imagegif($dest_image);     elseif ( $this->dest_type == THUMB_PNG )       imagepng ( $dest_image ),

  } 。

  /*     Description:       Save thumbnail image into the disc file.     Prototype:       void SaveThumbImage ( string image_file, resource dest_image )     Parameters:       image_file - destination file name       dest_img - thumbnail image identifier   */   function SaveThumbImage ( $image_file, $dest_image )   { 。

    imageinterlace ( $dest_image, $this->interlace ),

    if ( $this->dest_type == THUMB_JPEG )       imagejpeg ( $dest_image, $this->dest_file, $this->jpeg_quality );     elseif ( $this->dest_type == THUMB_GIF )       imagegif ( $dest_image, $this->dest_file );     elseif ( $this->dest_type == THUMB_PNG )       imagepng ( $dest_image, $this->dest_file ),

  } 。

// **************************************************************************** // PUBLIC METHODS // **************************************************************************** 。

  /*     Description:       Output thumbnail image into the browser or disc file according to the       values of parameters.     Prototype:       void Output ( )   */   function Output()   { 。

    $src_image = $this->LoadImage($this->src_file, $src_width, $src_height),

    $dest_size = $this->GetThumbSize($src_width, $src_height),

    $dest_width=$dest_size[0];     $dest_height=$dest_size[1],

    $dest_image=imagecreatetruecolor($dest_width, $dest_height);     if (!$dest_image)       trigger_error(E_005, E_USER_ERROR),

    imagecopyresampled( $dest_image, $src_image, 0, 0, 0, 0,       $dest_width, $dest_height, $src_width, $src_height ),

    if ($this->logo['file'] != NO_LOGO)       $this->AddLogo($dest_width, $dest_height, $dest_image),

    if ($this->label['text'] != NO_LABEL)       $this->AddLabel($dest_width, $dest_height, $dest_image),

    if ($this->dest_file == STDOUT)       $this->OutputThumbImage ( $dest_image );     else       $this->SaveThumbImage ( $this->dest_file, $dest_image ),

    imagedestroy ( $src_image );     imagedestroy ( $dest_image ),

  } 。

} // End of class definition 。

?> 。

 $tis = new ThumbnailImage();      $tis->src_file  = "这里写源文件的路径"      $tis->dest_type = THUMB_JPEG;//生成图片的类型是 jpg       $tis->dest_file = '这里写目标文件的路径',

  。

     $tis->max_width = 120;//自适应大小，但是最大宽度为120      $tis->max_height = 4000; //自适应大小，但是最大高度为4000      $tis->Output(),