posix_isatty

(PHP 4, PHP 5)

posix_isattyDetermine if a file descriptor is an interactive terminal

Description

bool posix_isatty ( int $fd )

Determines if the file descriptor fd refers to a valid terminal type device.

Parameters

fd

The file descriptor.

Return Values

Returns TRUE if fd is an open descriptor connected to a terminal and FALSE otherwise.

See Also

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User Contributed Notes 1 note

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hfuecks at phppatterns dot com
9 years ago
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"
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