Add Bootstrap styles to Gravity Forms fields

bootstrap-gforms.php

/**
 * Adding Bootstrap Styles to Gravity Forms
 */
add_filter("gform_field_content", "bootstrap_styles_for_gravityforms_fields", 10, 5);
function bootstrap_styles_for_gravityforms_fields($content, $field, $value, $lead_id, $form_id){
	
	// Currently only applies to most common field types, but can be expanded.
	
	if($field["type"] != 'hidden' && $field["type"] != 'list' && $field["type"] != 'multiselect' && $field["type"] != 'checkbox' && $field["type"] != 'fileupload' && $field["type"] != 'date' && $field["type"] != 'html' && $field["type"] != 'address') {
		$content = str_replace('class=\'medium', 'class=\'form-control medium', $content);
	}
	
	if($field["type"] == 'name' || $field["type"] == 'address') {
		$content = str_replace('<input ', '<input class=\'form-control\' ', $content);
	}
	
	if($field["type"] == 'textarea') {
		$content = str_replace('class=\'textarea', 'class=\'form-control textarea', $content);
	}
	
	if($field["type"] == 'checkbox') {
		$content = str_replace('li class=\'', 'li class=\'checkbox ', $content);
		$content = str_replace('<input ', '<input style=\'margin-left:1px;\' ', $content);
	}
	
	if($field["type"] == 'radio') {
		$content = str_replace('li class=\'', 'li class=\'radio ', $content);
		$content = str_replace('<input ', '<input style=\'margin-left:1px;\' ', $content);
	}	

	
	return $content;
} // End bootstrap_styles_for_gravityforms_fields()	

add_filter("gform_submit_button", "bootstrap_styles_for_gravityforms_buttons", 10, 5);
function bootstrap_styles_for_gravityforms_buttons($button, $form){

		$button = str_replace('class=\'gform_button', 'class=\'gform_button btn btn-primary', $button);
   
		return $button;
 
} // End bootstrap_styles_for_gravityforms_buttons()