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Editing File: /home/eticmes/www/wp-content/plugins/meta-box/inc/fields/key-value.php

<?php
defined( 'ABSPATH' ) || die;

/**
 * The key-value field which allows users to add pairs of keys and values.
 */
class RWMB_Key_Value_Field extends RWMB_Input_Field {
	public static function admin_enqueue_scripts() {
		wp_enqueue_style( 'rwmb-key-value', RWMB_CSS_URL . 'key-value.css', [], RWMB_VER );
		wp_style_add_data( 'rwmb-key-value', 'path', RWMB_CSS_DIR . 'key-value.css' );
	}

/**
	 * Get field HTML.
	 *
	 * @param mixed $meta  Meta value.
	 * @param array $field Field parameters.
	 *
	 * @return string
	 */
	public static function html( $meta, $field ) {
		// Key.
		$key                       = isset( $meta[0] ) ? $meta[0] : '';
		$attributes                = self::get_attributes( $field, $key );
		$attributes['placeholder'] = $field['placeholder']['key'];
		$html                      = sprintf( '<input %s>', self::render_attributes( $attributes ) );

// Value.
		$val                       = isset( $meta[1] ) ? $meta[1] : '';
		$attributes                = self::get_attributes( $field, $val );
		$attributes['placeholder'] = $field['placeholder']['value'];
		$html                     .= sprintf( '<input %s>', self::render_attributes( $attributes ) );

return $html;
	}

protected static function begin_html( array $field ) : string {
		return parent::begin_html( $field ) . parent::input_description( $field );
	}

protected static function input_description( array $field ) : string {
		return '';
	}

/**
	 * Sanitize field value.
	 *
	 * @param mixed $new     The submitted meta value.
	 * @param mixed $old     The existing meta value.
	 * @param int   $post_id The post ID.
	 * @param array $field   The field parameters.
	 *
	 * @return array
	 */
	public static function value( $new, $old, $post_id, $field ) {
		foreach ( $new as &$arr ) {
			if ( empty( $arr[0] ) && empty( $arr[1] ) ) {
				$arr = false;
			}
		}
		$new = array_filter( $new );
		return $new;
	}

/**
	 * Normalize parameters for field.
	 *
	 * @param array $field Field parameters.
	 *
	 * @return array
	 */
	public static function normalize( $field ) {
		$field['clone']    = true;
		$field['multiple'] = true;
		$field             = parent::normalize( $field );

$field['attributes']['type'] = 'text';
		$field['placeholder']        = wp_parse_args( (array) $field['placeholder'], [
			'key'   => __( 'Key', 'meta-box' ),
			'value' => __( 'Value', 'meta-box' ),
		] );
		return $field;
	}

/**
	 * Format value for the helper functions.
	 *
	 * @param array        $field   Field parameters.
	 * @param string|array $value   The field meta value.
	 * @param array        $args    Additional arguments. Rarely used. See specific fields for details.
	 * @param int|null     $post_id Post ID. null for current post. Optional.
	 *
	 * @return string
	 */
	public static function format_clone_value( $field, $value, $args, $post_id ) {
		return sprintf( '<label>%s:</label> %s', $value[0], $value[1] );
	}
}

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