如何逐一显示PHP中的每个“回声”。相反，直到所有脚本完成为止

i have a php script that takes some moments to execute. And it does multiple "echos" as the progress is going. This script connects to ftp, deletes all contents and then upload new files. All is working fine and i'm getting the result but only when the script ends.i have a php script that takes some moments to