How can I detect STDOUT redirection in PHP CLI?

问题

I've a PHP CLI script that uses shell escape sequences for bolding, but I want to be able to disable these automatically when the script's being redirected (eg to a log file).

I can find ways to detect STDOUT redirection in everything but PHP so far... so can anyone tell me how it is done in PHP?

回答1:

This should give you what you want:

if(posix_isatty(STDOUT))
    echo "No Redirection";
else
    echo "Redirection!";

来源：https://stackoverflow.com/questions/5730268/how-can-i-detect-stdout-redirection-in-php-cli