<?php
/**
 * Sanitize a string destined to be a tooltip.
 *
 * @since  1.4.1 Tooltips are encoded with htmlspecialchars to prevent XSS. Should not be used in conjunction with esc_attr()
 * @param  string $var Data to sanitize.
 * @return string
 */
function amp_wp_sanitize_tooltip( $var ) {
	return htmlspecialchars(
		wp_kses(
			html_entity_decode( $var ), array(
				'br'     => array(),
				'em'     => array(),
				'strong' => array(),
				'small'  => array(),
				'span'   => array(),
				'ul'     => array(),
				'li'     => array(),
				'ol'     => array(),
				'p'      => array(),
			)
		)
	);
}

/**
 * Notation to numbers.
 *
 * This function transforms the php.ini notation for numbers (like '2M') to an integer.
 *
 * @param  string $size Size value.
 * @return int
 */
function amp_wp_let_to_num( $size ) {
	$l = substr( $size, -1 );
	$ret = substr( $size, 0, -1 );
	$byte = 1024;

	switch( strtoupper( $l ) ) {
		case 'P':
			$ret *= 1024;
			// No break.
		case 'T':
			$ret *= 1024;
			// No break.
		case 'G':
			$ret *= 1024;
			// No break.
		case 'M':
			$ret *= 1024;
			// No break.
		case 'K':
			$ret *= 1024;
			// No break.
	}
	return $ret;
}

/**
 * Clean variables using sanitize_text_field. Arrays are cleaned recursively.
 * Non-scalar values are ignored.
 *
 * @param string|array $var Data to sanitize.
 * @return string|array
 */
function amp_wp_clean( $var ) {
	if ( is_array( $var ) ) {
		return array_map( 'amp_wp_clean', $var );
	} else {
		return is_scalar( $var ) ? sanitize_text_field( $var ) : $var;
	}
}