callback_transformer.md

CallbackTransformer

Call a PHP callable (function or static method) with the input value. The value is inserted between configurable left and right parameters: callback(...left_parameters, $value, ...right_parameters).

Transformer reference

• Service: CleverAge\ProcessBundle\Transformer\CallbackTransformer
• Transformer code: callback

Accepted inputs

any: whatever the callback accepts.

Possible outputs

any: the return value of the callback.

Options

Code	Type	Required	Default	Description
callback	string|array	X		A valid PHP callable (e.g. strtoupper, ['App\MyClass', 'myStaticMethod']), checked with is_callable
left_parameters	array		[]	Parameters passed before the value
right_parameters	array		[]	Parameters passed after the value
additional_parameters	array		[]	Deprecated: use right_parameters instead. Only used when right_parameters is empty

Examples

• Simple PHP function

# Transformer options level
callback:
  callback: strtoupper

• Function with extra parameters: json_decode($value, true)

# Transformer options level
callback:
  callback: json_decode
  right_parameters: [true]

• Value in second position: explode(',', $value)

# Transformer options level
callback:
  callback: explode
  left_parameters: [',']