function img2thumb($src_img,$dst_img,$width = 64,$height = 64,$nocut = 0) {
if(!is_file($src_img)) return false;
if(!($width*$height)) return false;
$ext = strtolower(substr(strrchr($src_img,'.'),1));
if(!$ext) return false;
$otfunc = 'image' . ($ext == 'jpg' ? 'jpeg' : $ext);
if(!function_exists($otfunc)) return false;
$srcinfo = getimagesize($src_img);
if(!$srcinfo) return false;
$src_w = $srcinfo[0];
$src_h = $srcinfo[1];
$type = strtolower(substr(image_type_to_extension($srcinfo[2]),1));
$openfunc = 'imagecreatefrom' . ($type == 'jpg' ? 'jpeg' : $type);
if(!function_exists($openfunc)) return false;
$createfunc = 'imagecreate';
$buildfunc = 'imagecopyresized';
$x=$y=0;
$src_t = $src_w / $src_h;
if($src_t > $width / $height) {
$dst_w = $width;
$dst_h = $width / $src_t;
$nocut && $y = ($height - $dst_h)/2;
}
else {
$dst_w = $src_t * $height;
$dst_h = $height;
$nocut && $x = ($width - $dst_w)/2;
}
$src = $openfunc($src_img);
$dst = $createfunc($nocut ? $width :$dst_w,$nocut ? $height :$dst_h);
$white = imagecolorallocate($dst,255,255);
$buildfunc($dst,$src,$x,$y,$dst_w,$dst_h,$src_w,$src_h);
$otfunc($dst,$dst_img);
imagedestroy($dst);
imagedestroy($src);
return true;
}

/***   来自编程之家 jb51.cc（jb51.cc）   ***/