PHP fgets loads CPU to 100%

user_6246418 0
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I've made read key press function in PHP. The code sets non-block stream mode for STDIN and in while waits when STDIN will receive any data. It works, but I noticed that function loads CPU to 100%. How much is bad this code for CPU and is there any another way to check is STDIN contains any data?

    $stdin = fopen("php://stdin", "r");
    stream_set_blocking($stdin, false);
    system("stty cbreak -echo");

    while (true)
    {
        if ($keypress = strtoupper(fgets($stdin)))
        {
            break;
        }
    }
    stream_set_blocking($stdin, true);
stdin cpu stream php
1 Answers

My problem was resolved after I added time_nanosleep for 5 milliseconds on each loop iteration:

$stdin = fopen("php://stdin", "r");
stream_set_blocking($stdin, false);
system("stty cbreak -echo");
$t = 1000000;
while (!($keypress = strtoupper(fgets($stdin))))
{
    time_nanosleep(0, 5 * $t);
}
stream_set_blocking($stdin, true);
user_62464180
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