Can be useful to determine whether output is being piped elsewhere, for PHP shell scripts, for example;
#!/usr/local/bin/php
<?php
if ( !posix_isatty(STDOUT) ) {
fwrite(STDOUT, "Invalid TTY\n");
exit(2);
}
fwrite(STDOUT, "Enter you name\n");
$name = fgets(STDIN);
fwrite(STDOUT,"Hello $name\n");
exit(0);
?>
If this script is like:
script.php > outfile
outfile will contain "Invalid TTY"
posix_isatty(PHP 3 >= 3.0.13, PHP 4, PHP 5) posix_isatty -- Determine if a file descriptor is an interactive terminalDescriptionbool posix_isatty ( int fd )
posix_isatty
hfuecks at phppatterns dot com
07-May-2004 02:12
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posix_getuid