Composer return codes

When you run a composer command, the command line can show an outcome return code. To find the return code, perform the following action:

On Windows Operating systems:

echo %ERRORLEVEL%

On UNIX Operating systems:

echo $?

The composer command line has the following return codes:

0

Command completed successfully.

4

Command completed with a warning.

8

Command completed with an error.

16

Command fails.

32

Command has a syntax error.