aaronbullard/php-schema

{
    "title": "Address",
    "type": "object",
    "properties": {
        "street_1": {
            "type": "string"
        },
        "street_2": {
            "oneOf": [
                {"type": "string"},
                {"type": "null"}
            ]
        },
        "city": {
            "type": "string"
        },
        "state": {
            "type": "string",
            "maxLength": 2
        },
        "zipcode": {
            "type": "string",
            "pattern": "^[0-9]{5}(?:-[0-9]{4})?$"
        }
    },
    "required": ["street_1", "city", "state", "zipcode"],
    "additionalProperties": false
}