azure-storage-table/src/Table/Models/BatchOperationParameterName.php
public static function isValid($paramName)
    {
        switch ($paramName) {
            case self::BP_TABLE:
            case self::BP_ENTITY:
            case self::BP_PARTITION_KEY:
            case self::BP_ROW_KEY:
            case self::BP_ETAG:
                return true;
            default:
                return false;
        }
    }
public static function isValid($paramName)
    {
        switch ($paramName) {
            case self::BP_TABLE:
            case self::BP_ENTITY:
            case self::BP_PARTITION_KEY:
            case self::BP_ROW_KEY:
            case self::BP_ETAG:
                return true;
            default:
                return false;
        }
    }
Validates if $paramName is already defined.

@param string $paramName The batch operation parameter name.

@internal

@return boolean