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/proc/self/cwd/wp-content/plugins/kirki/field/

//proc/self/cwd/wp-content/plugins/kirki/field/class-kirki-field-custom.php

 <?php
/**
 * Override field methods
 *
 * @package     Kirki
 * @subpackage  Controls
 * @copyright   Copyright (c) 2019, Ari Stathopoulos (@aristath)
 * @license     https://opensource.org/licenses/MIT
 * @since       2.2.7
 */

/**
 * Field overrides.
 */
class Kirki_Field_Custom extends Kirki_Field {

	/**
	 * Sets the control type.
	 *
	 * @access protected
	 */
	protected function set_type() {
		$this->type = 'kirki-custom';
	}

	/**
	 * Sets the $sanitize_callback
	 *
	 * @access protected
	 */
	protected function set_sanitize_callback() {

		// If a custom sanitize_callback has been defined,
		// then we don't need to proceed any further.
		if ( ! empty( $this->sanitize_callback ) ) {
			return;
		}

		// Custom fields don't actually save any value.
		// just use __return_true.
		$this->sanitize_callback = '__return_true';
	}
}