php 更新命令行输出，即进度
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Update Command-line Output, i.e. for Progress
提问by Adam
I'd like to be able to show a progress meter in a simple PHP script on the command line. Instead of seeing
我希望能够在命令行上的简单 PHP 脚本中显示进度表。而不是看到
Progress: 0%
Progress: 1%
etc...
I'd like just the number to change, and replace the previous number, much like git clone does for example Resolving deltas: 100% (8522/8522), done..
我只想更改数字，并替换以前的数字，就像 git clone 所做的那样Resolving deltas: 100% (8522/8522), done.。
While searching for this I found the same question answered in Perl, which is perfect, but I couldn't find it in PHP. Is it possible? If not, I'll resort to C.
在搜索这个时，我发现在 Perl 中回答了同样的问题，这是完美的，但我在 PHP 中找不到它。是否可以？如果没有，我会求助于C。
Thanks
谢谢
Update:If anyone's interested in the C++ version, it's here.
更新：如果有人对 C++ 版本感兴趣，请点击此处。
回答by Pascal MARTIN
This can be done using ANSI Escape Sequences-- see herefor a list.
这可以使用ANSI 转义序列来完成——请参见此处的列表。
In PHP, you'll use "\033"when it's indicated ESCon that page.
在 PHP 中，您将在该页面上"\033"指示时使用ESC。
In your case, you could use something like this :
在你的情况下，你可以使用这样的东西：
echo "Progress : "; // 5 characters of padding at the end
for ($i=0 ; $i<=100 ; $i++) {
echo "3[5D"; // Move 5 characters backward
echo str_pad($i, 3, ' ', STR_PAD_LEFT) . " %"; // Output is always 5 characters long
sleep(1); // wait for a while, so we see the animation
}
I simplified a bit, making sure I always have 5 extra characters, and always displaying the same amount of data, to always move backwards by the same number of chars...
我简化了一点，确保我总是有 5 个额外的字符，并且总是显示相同数量的数据，总是向后移动相同数量的字符......
But, of course, you should be able to do much more complicated, if needed ;-)
但是，当然，如果需要，您应该能够做更复杂的事情；-)
And there are many other interesting escape sequences : colors, for instance, can enhance your output quite a bit ;-)
还有许多其他有趣的转义序列：例如，颜色可以大大增强您的输出；-)
回答by Dom
Just for the record though an old thread: Instead of using fancy ANSI Escape sequencing to move the curser back I just move it back to the beginning of the line using "\r" instead of to the beginning of the next line "\n". Add a few spaces after your echo to overwrite anything that was there previously, like e.g. so:
只是为了记录，虽然旧线程：而不是使用花哨的 ANSI Escape 序列将光标移回我只是使用“\r”将其移回行的开头而不是下一行的开头“\n” . 在 echo 后添加几个空格以覆盖以前存在的任何内容，例如：
for ($i=0 ; $i<=100 ; $i++) {
echo "Progress: $i % \r";
sleep(1);
}
