//创建图片水印
private function create_water_maker()
{
$_path = dirname(__FILE__);
$_path = str_ireplace('','/',$_path);
$_font = $_path.'/weibei.TTF';
//指定图片路径
$src = $this->filePath;
//获取图片信息
$info = getimagesize($src);
//获取图片扩展名
$type = image_type_to_extension($info[2],false);
//动态的把图片导入内存中
$fun = "imagecreatefrom{$type}";
$image = $fun($src);
//指定字体颜色
$col = imagecolorallocatealpha($image,0,255,255,95);
//指定字体内容
$content = 'www.lan6.net';
//给图片添加文字
//imagestring($image,5,20,30,$content,$col);
// $info['0'] width $info['1'] height
$font_size = $info['1']/5;
$font_size_w = $info['0']/7;
if($font_size_w < $font_size)
{
$font_size = $font_size_w;
}
// 魏碑体大概的所占宽和高
$_font_width = $font_size*7;
$_font_height = $font_size*5;
// 文字对应的位置 从什么地方开始
$_left_font = ($info['0']-$_font_width)/2;
$_bottom_font = $info['1'] - ($info['1']-$_font_height)/2;
imagettftext($image,$font_size,30,$_left_font,$_bottom_font,$col,$_font,$content);
$func = "image{$type}";
ob_start();
$func($image);
//销毁图片
$_data = ob_get_contents();
imagedestroy($image);
ob_end_clean();
file_put_contents($src, $_data);
}
原文链接：http://lan6.net/experience-experience_see-content-fd2dbb03231d12cd0879d9f9556c7a76.html
