WP_Widget::get_field_name( string $field_name )

Constructs name attributes for use in form() fields

Description

This function should be used in form() methods to create name attributes for fields to be saved by update()

Parameters

$field_name

(string) (Required) Field name

Return

(string) Name attribute for $field_name

Source

File: wp-includes/class-wp-widget.php 

	public function get_field_name($field_name) {
		if ( false === $pos = strpos( $field_name, '[' ) ) {
			return 'widget-' . $this->id_base . '[' . $this->number . '][' . $field_name . ']';
		} else {
			return 'widget-' . $this->id_base . '[' . $this->number . '][' . substr_replace( $field_name, '][', $pos, strlen( '[' ) );
		}
	}

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Changelog

Changelog
Version Description
WP-4.4.0 Array format field names are now accepted.
WP-2.8.0 Introduced.