How can I detect STDOUT redirection in PHP CLI?

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 开发者_C百科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?

---

This should give you what you want:

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

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For Windows, you can use this:

$b = stream_isatty(STDIN);
if ($b) {
   echo "no redirect\n";
} else {
   echo "redirect\n";
}

https://php.net/function.stream-isatty