Question

PHP自定义函数

function outPut($img,$filename,$newName=''){
$imginfo = getimagesize($filename);
switch($imginfo['mime']){
case 'image/jpeg':
if(empty($newName)){
$img = imagejpeg($img);
}else{
$img = imagejpeg($img,$newName);
}
break;
case 'image/gif':
if(empty($newName)){
$img = imagegif($img);
}else{
$img = imagegif($img,$newName);
}
break;
case 'image/png':
if(empty($newName)){
$img = imagepng($img);
}else{
$img = imagepng($img,$newName);
}
break;
default:
return false;
}
return $img;
}

这样写的好处是什么？为什么不直接
case 'image/jpeg':
$img = imagejpeg($img);

Answer 1

学习了，继续学习