mixed filter(string $key, mixed $default = null, int $filter = FILTER_DEFAULT, mixed $options = array())
Filter key.
mixed filter(string $key, mixed $default = null, int $filter = FILTER_DEFAULT, mixed $options = array())
Filter key.
| string | $key | Key |
| mixed | $default | Default = null |
| int | $filter | FILTER_* constant |
| mixed | $options | Filter options |
| mixed |
| http://php.net/manual/en/function.filter-var.php |
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