header('Content-type: image/jpeg')和imagejpeg($img)可以输出图像，但没办法同时输出其他内容，比如一段,
如果用imagejpeg($img, '路径'),先保存图像再输出要刷新网页。
有什么办法可以实现：在同一个网页，用表单输入参数，用GD2制作一个图像，再输出图像在这个页面，保留html的内容，不要刷新。
本人新手，可能问题水平比较低，各位海涵。
回复讨论(解决方案)
imagejpeg($img, '路径');
echo '
';
这样试试
将你需要输出的图片单独封装,路径可以为http://www.example.com/action/method/
需要同时输出的html 中加入image标签显示,
<html><head></head><body>...<img src="/static/imghwm/default1.png" data-src="http://www.example.com/action/method/" class="lazy" alt="用header和imagejpeg配合输出图像的问题" >...</body></html>
貌似只能封装了，二楼的方法要刷新才能显示由当前页面输入数据所制成的图表。
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