Example Bitbucket Pipeline CI script to deploy a PHP/WordPress website using FTP.

bitbucket-pipelines.yml

# Auto deploy staging to staging
# Manual deploy master to production
image: php:7.1.29

pipelines:
  branches:
    staging:
      - step:
          name: Deploy to Staging
          script:
            - echo "Deploy to Staging"
            - apt-get update -qq && apt-get install -y -qq lftp
            - lftp -c "set ftp:ssl-allow no; open -u '$STAGING_USER','$STAGING_PASSWORD' '$STAGING_HOST'; mirror -Rnv ./ / --ignore-time --parallel=10 --exclude-glob .git* --exclude .git/"
    master:
      - step:
          script:
            - echo "Deploy to Production"
      - step:
          name: Deploy to Production
          script:
            - apt-get update -qq && apt-get install -y -qq lftp
            - lftp -c "set ftp:ssl-allow no; open -u $PRODUCTION_USER,'$PRODUCTION_PASSWORD' $PRODUCTION_HOST; mirror -Rnv ./ / --ignore-time --parallel=10 --exclude-glob .git* --exclude .git/"
          trigger: manual