帮我看看为什么没error但是图片显示不出来

Question

<?php$url = 'img/sex.jpg';$content = file_get_contents($url);$filename = 'img/sex.jpg';file_put_contents($filename,$contents);$yrl = 'img/logo.jpg';file_put_contents('img/logo.jpg',file_get_contents($url));$img = imagecreatefromjpeg($filename);$logo = imagecreatefromjpeg('img/logo.jpg');$size = getimagesize('img/logo.jpg');imagecopy($img,$logo,15,15,0,0,$size[0],$size[1]);header("content-type: image/jpeg");imagejpeg($img);?>

Answer 1

要加一个头才会显示图片的

Answer 2

什么头？