009-生成水印图片+生成缩略图（PHP）

<?php

/**
 * 生成水印图片
 */
//1.获取图片资源
$big = imagecreatefromjpeg('./kaola.jpg');  //大图
$small = imagecreatefrompng('./t1.png');    //水印图

//2.获取图像大小
list($bw , $bh) = getimagesize('./kaola.jpg');
list($w , $h) = getimagesize('./t1.png');

//imagecopymerge(dst_im, src_im, dst_x, dst_y, src_x, src_y, src_w, src_h, pct)
//imagecopymerge("目标图"，"水印图"，"目标图的x坐标"，"y坐标"，"水印图的x"，"y"，"宽"，"高"，"透明度")；
imagecopymerge($big, $small, $bw-$w, $bh-$h, 0, 0, $w, $h, 40);

imagepng($big , 't4.png');

imagedestroy($big);
imagedestroy($small);


##################################################################################

/**
 * 生成缩略图
 */
$big = imagecreatefromjpeg('./kaola.jpg');
list($w , $h) = getimagesize('./kaola.jpg');

//创建小画布
$small = imagecreatetruecolor($w/2, $h/2);

//拷贝图像并修改大小
//imagecopyresampled(dst_image, src_image, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h)
imagecopyresampled($small, $big, 0, 0, 0, 0, $w/2, $h/2, $w, $h);

imagepng($small , './t6.png');

imagedestroy($big);
imagedestroy($small);

?>