Execution of composer.phar in Windows temp folder does not work

[dargmuesli]

Composer is not installed on my Windows machine and I run this command:

composer('update', {
    'async': false
});

This command is executed: C:\Users\USERNAME\AppData\Local\Temp/gulp-composer.phar update --working-dir d:\WorkingDirectory\GitHub\randomwinpicker.de --ansi but of it doesn't work because of the missing php at the beginning of the command.
Only the Composer help dialog is printed, no task is executed.