The type and CSS class(es) of the button. Core values include 'primary', 'small', and 'large'. Default: 'primary large'
$name(string)
The HTML name of the submit button. If no id attribute is given in the $other_attributes parameter, $name will be used as the button's id. Default: 'submit'
$wrap(true|false)
True if the output button should be wrapped in a paragraph tag, false otherwise. Default: true
$other_attributes(array|string)
Other attributes that should be output with the button, mapping attributes to their values, e.g. array('id'=>'search-submit'). These key/value attribute pairs will be output as attribute="value", where attribute is the key. Attributes can also be provided as a string, e.g. id="search-submit", though the array format is generally preferred. Default: empty string