php生成缩略图,文本转换成图形

时间：2015-01-23 来源：西部数据作者：西部数据

这是一款老外的经典的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.

php生成缩略图,文本转换成图形实例代码如下:

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; } }

  }

}

//开源代码phpfensi.com

//调用方法代码如下:

$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();