Funny thing:....

root@d8dc3dd9b155:/# which php
/opt/phpenv/shims/php
root@d8dc3dd9b155:/# more /opt/phpenv/shims/php
#!/usr/bin/env bash
set -e
[ -n "$RBENV_DEBUG" ] && set -x

program="${0##*/}"
if [ "$program" = "ruby" ]; then
  for arg; do
    case "$arg" in
    -e* | -- ) break ;;
    */* )
      if [ -f "$arg" ]; then
        export RBENV_DIR="${arg%/*}"
        break
      fi
      ;;
    esac
  done
fi

export RBENV_ROOT="/opt/phpenv"
exec "/opt/phpenv/libexec/rbenv" exec "$program" "$@"