Traversable data validation

Symfony's All Constraint allows you to validate \Traversable data. For example data read from a csv or Excel provided via a yield function. The * notation marks the set as iterable and internally the All constraint will be used instead of Collection.

ArrayIterator example

Rules:
For a csv with 4 columns.

[
    '*.0' => 'required|int|min:1',
    '*.1' => 'required|string|email',
    '*.2' => 'required|float',
    '*.3' => 'required|string|max:2000'
]

Validates:

$iterator = new ArrayIterator(
    [
        ['4', 'exampleA@example.com', '2.59', 'apples'],
        ['9', 'exampleB@example.com', '3.06', 'raspberries'],
        ['3', 'exampleC@example.com', '115.99', 'pineapple'],
    ]   
);

Non empty value set

By default the * will allow the set to be empty. If you validate a set of values, you can mark the set as non-empty with the required rule.

Rules:

['*' => 'required|int']

Validates:

success: [1, 2, '3']
fails:   []
fails:   [1, 'a']