<?php
/**
 * The Forminator_Calculator_Symbol_Function_Years_Between class.
 *
 * @package Forminator
 */

/**
 * Always positive (abs)
 * Always round up (ceil)
 * Arguments already in unix timestamp
 *
 * @see http://php.net/manual/en/function.abs.php
 * @see http://php.net/manual/en/function.ceil.php
 */
class Forminator_Calculator_Symbol_Function_Years_Between extends Forminator_Calculator_Symbol_Function_Abstract {

	/**
	 * Identifiers
	 *
	 * @var array
	 */
	protected $identifiers = array( 'yearsBetween' );

	/**
	 * Execute
	 *
	 * @inheritdoc
	 * @param mixed $arguments Arguments.
	 * @throws Forminator_Calculator_Exception When there is an Calculator error.
	 */
	public function execute( $arguments ) {
		if ( count( $arguments ) !== 2 ) {
			throw new Forminator_Calculator_Exception( 'Error: Expected two argument, got ' . count( $arguments ) );
		}

		$between = $arguments[0] - $arguments[1];
		$between = abs( $between );

		$years_between = $between / YEAR_IN_SECONDS;

		return ceil( $years_between );
	}
}
