PHP-ETL - Rule Engine

Legacy Array Syntax

If you’re starting a new chain, you don’t need this page — use Typed Rules instead. This is reference material for chains still using the original array-based syntax. Migrating an existing chain? See Migrating to Typed Rules.

The original syntax — plain nested arrays, each keyed by rule name — still works exactly as before, but every place that accepts rules now triggers a deprecation notice when given an array instead of a RuleConfigInterface. Existing chains keep running unchanged; migrate at your own pace to the typed classes.

Each rule below defines how a specific value is computed. Rules can be nested and composed for complex transformations.

Expression Language (expression_language)

Leverages the Symfony Expression Language to compute values dynamically.

Value Fetcher (get)

Fetches a value from the input array by key.

Implode (implode)

Concatenates multiple values into a single string using a delimiter.

String To Lower (str_lower)

Converts a string to lowercase.

String To Upper (str_upper)

Converts a string to uppercase.

Constant (constant)

Returns a constant, static value.

Example

operation: rule-engine-transformer
options:
  add: false
  columns:
    FullName:
      rules:
        - implode:
            values:
              - [{ get: { field: "FirstName" } }]
              - [{ get: { field: "LastName" } }]
            with: " "
    IsActive:
      rules:
        - expression_language:
            expression: "rowData['IsSubscribed'] == 'yes'"