Execute grunt task from PHP script

I want to execute a grunt task in a php script with exec('grunt')

, but I always get 127

back. Any other bash command is fine.

I even made grunt.sh with

#!/bin/bash
grunt

      

        
        
        
      

    

and tried to execute with help exec('grunt.sh')

, but it will get it as well 127

.

Any thoughts on this?