在线服务器上的php计数与我的localhost不同

i use $count_files to loop through images and show those images bellow the main image of the post. on local server if there is 0 image count is 0 , if there is 1 image count is 1 etc.. (that's right). but on online server (linux host) even when there is no image it returns count as 1 , but for the rest it is correct for 1 is 1, for 2 is 2 etc..i use $count_files to loop through images and s