常用header汇总：
header(\'Content-Type: text/html; charset=utf-8\'); //网页编码
header(\'Content-Type: text/plain\'); //纯文本格式
header(\'Content-Type: image/jpeg\'); //JPG、JPEG
header(\'Content-Type: application/zip\'); // ZIP文件
header(\'Content-Type: application/pdf\'); // PDF文件
header(\'Content-Type: audio/mpeg\'); // 音频文件
header(\'Content-type: text/css\'); //css文件
header(\'Content-type: text/javascript\'); //js文件
header(\'Content-type: application/json\'); //json
header(\'Content-type: application/pdf\'); //pdf
header(\'Content-type: text/xml\'); //xml
header(\'Content-Type: application/x-shockw**e-flash\'); //Flash动画