<?php
for ($i = 0; $i <= 50; $i++) {
printf("progress: [%-50s] %d%%/r", str_repeat('#',$i), $i * 2);
usleep(1000 * 100);
}
echo "/n";
echo "Done./n";
每次用 /r 结尾就是了。/n 是 new line，/r 是 return 。也就是回到行首。
bash 版：
b=''
for ((i=0;$i<=100;i+=2))
do
printf "progress: [%-50s] %d%%/r" $b $i
sleep 0.1
b+='#'
done
echo
