Php/docs/features.commandline.io-streams
Input/output streams
The CLI SAPI defines a few constants for I/O streams to make programming for the command line a bit easier.
Constant | Description |
---|---|
STDIN
|
An already opened stream to
If you want to read single line from
|
STDOUT
|
An already opened stream to
|
STDERR
|
An already opened stream to
|
Given the above, you don't need to open e.g. a stream for
stderr
yourself but simply use the constant instead of
the stream resource:
php -r 'fwrite(STDERR, "stderr\n");'
You do not need to explicitly close these streams, as they are closed automatically by PHP when your script ends.
Note:
These constants are not available if reading the PHP script from
stdin
.