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                             stream_isatty(PHP 7 >= 7.2.0) stream_isatty — Check if a stream is a TTY Description
   bool stream_isatty
    ( resource  $stream)
   Determines if stream  Parameters
 Return Values
   Returns  Examples
 Example #1 stream_isatty() example This command can be used to determine if a standard output / standard error stream is redirected to a file. php -r "var_export(stream_isatty(STDERR));" The above example will output something similar to: true php -r "var_export(stream_isatty(STDERR));" 2>output.txt The above example will output something similar to: false | 
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