{
$dst_sh = $dst_sw/$src_w*$src_h;
$dst_sim = imagecreatetruecolor($dst_sw,$dst_sh); //新建缩略图真彩位图（等比例缩小原图尺寸）
imagecopyresampled($dst_sim,$src_im,0,0,0,0,$dst_sw,$dst_sh,$src_w,$src_h); //原图图像写入新建真彩位图中
}
switch($src_type)
{
case 1:
imagegif($dst_sim,$sall_path,$simclearly);//生成gif文件，图片清晰度0-100
break;
case 2:
imagejpeg($dst_sim,$sall_path,$simclearly);//生成jpg文件，图片清晰度0-100
break;
case 3:
imagepng($dst_sim,$sall_path,$simclearly);//生成png文件，图片清晰度0-100
break;
//case 6:
//imagewbmp($dst_sim,$sall_path);
break;
}
//释放缓存
imagedestroy($dst_sim);
}
//释放缓存
imagedestroy($src_im);
}
?>
php等比例生成缩略图函数2
function reSizeImg($imgSrc, $resize_width, $resize_height, $isCut=false) {
//图片的类型
$type = substr ( strrchr ( $imgSrc, "." ), 1 );
//初始化图象
if ($type == "jpg") {
$im = imagecreatefromjpeg ( $imgSrc );
}
if ($type == "gif") {
$im = imagecreatefromgif ( $imgSrc );
}
if ($type == "png") {
$im = imagecreatefrompng ( $imgSrc );
}
//目标图象地址
$full_length = strlen ( $imgSrc );
$type_length = strlen ( $type );
$name_length = $full_length - $type_length;
$name = substr ( $imgSrc, 0, $name_length - 1 );
$dstimg = $name . "_s." . $type;
$width = imagesx ( $im );
$height = imagesy ( $im );
//生成图象
//改变后的图象的比例
$resize_ratio = ($resize_width) / ($resize_height);
//实际图象的比例
$ratio = ($width) / ($height);
if (($isCut) == 1) //裁图
{
if ($ratio >= $resize_ratio) //高度优先
{
$newimg = imagecreatetruecolor ( $resize_width, $resize_height );
imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, (($height) * $resize_ratio), $height );
ImageJpeg ( $newimg, $dstimg );
}
if ($ratio < $resize_ratio) //宽度优先
{
$newimg = imagecreatetruecolor ( $resize_width, $resize_height );
imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, $width, (($width) / $resize_ratio) );
ImageJpeg ( $newimg, $dstimg );
}
} else //不裁图
{
if ($ratio >= $resize_ratio) {
$newimg = imagecreatetruecolor ( $resize_width, ($resize_width) / $ratio );
imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, ($resize_width) / $ratio, $width, $height );
ImageJpeg ( $newimg, $dstimg );
}
if ($ratio < $resize_ratio) {
$newimg = imagecreatetruecolor ( ($resize_height) * $ratio, $resize_height );
imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, ($resize_height) * $ratio, $resize_height, $width, $height );
ImageJpeg ( $newimg, $dstimg );
}
}
ImageDestroy ( $im );
}
