PHP 中 使用创建图片函数

先开启php.ini 中extension=php_gd2.dll类库，重启服务。

如下是根据已有图片文件，创建指定大小图片文件。

 static function ImageMakeThumb($srcFile, $dstFile, $dstW, $dstH) {
  try {
   list ( $width, $height, $type, $attr ) = getimagesize ( $srcFile );
   echo $width, $height, $type, $attr;
   //1 = GIF，2 = JPG，3 = PNG ,6 = BMP
   switch ($type) {
    case 1 :
     $im = ImageCreateFromGIF ( $srcFile );
     break;
    case 2 :
     $im = @imagecreatefromjpeg( $srcFile );
     break;
    case 3 :
     $im = @ImageCreateFromPNG ( $srcFile );
     break;
    case 6:
     $im = @imagecreatefromwbmp( $srcFile );
     break;
    default :
     return False;
   }
   
   if (! $im)
    return False;
   $srcW = ImageSX ( $im );
   $srcH = ImageSY ( $im );
   $dstX = 0;
   $dstY = 0;
   if ($srcW * $dstH > $srcH * $dstW) {
    $fdstH = round ( $srcH * $dstW / $srcW );
    $dstY = floor ( ($dstH - $fdstH) / 2 );
    $fdstW = $dstW;
   } else {
    $fdstW = round ( $srcW * $dstH / $srcH );
    $dstX = floor ( ($dstW - $fdstW) / 2 );
    $fdstH = $dstH;
   }
   $ni = ImageCreate ( $dstW, $dstH );
   $dstX = ($dstX < 0) ? 0 : $dstX;
   $dstY = ($dstX < 0) ? 0 : $dstY;
   $dstX = ($dstX > ($dstW / 2)) ? floor ( $dstW / 2 ) : $dstX;
   $dstY = ($dstY > ($dstH / 2)) ? floor ( $dstH / s ) : $dstY;
   $black = ImageColorAllocate ( $ni, 0, 0, 0 );
   imagefilledrectangle ( $ni, 0, 0, $dstW, $dstH, $black );
   ImageCopyResized ( $ni, $im, $dstX, $dstY, 0, 0, $fdstW, $fdstH, $srcW, $srcH );
   ImageJpeg ( $ni, $dstFile );
   imagedestroy ( $im );
   imagedestroy ( $ni );
   return True;
  } catch ( Exception $ef ) {
   echo $ef ;
   return false;
  }
 }