File Content: validate.php <?php if ( ! defined( 'ABSPATH' ) ) { die; } // Cannot access directly. /** * * Email validate * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_validate_email' ) ) { function ulf_validate_email( $value ) { if ( ! filter_var( $value, FILTER_VALIDATE_EMAIL ) ) { return esc_html__( 'Please enter a valid email address.', 'ulf' ); } } } /** * * Numeric validate * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_validate_numeric' ) ) { function ulf_validate_numeric( $value ) { if ( ! is_numeric( $value ) ) { return esc_html__( 'Please enter a valid number.', 'ulf' ); } } } /** * * Required validate * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_validate_required' ) ) { function ulf_validate_required( $value ) { if ( empty( $value ) ) { return esc_html__( 'This field is required.', 'ulf' ); } } } /** * * URL validate * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_validate_url' ) ) { function ulf_validate_url( $value ) { if ( ! filter_var( $value, FILTER_VALIDATE_URL ) ) { return esc_html__( 'Please enter a valid URL.', 'ulf' ); } } } /** * * Email validate for Customizer * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_customize_validate_email' ) ) { function ulf_customize_validate_email( $validity, $value, $wp_customize ) { if ( ! sanitize_email( $value ) ) { $validity->add( 'required', esc_html__( 'Please enter a valid email address.', 'ulf' ) ); } return $validity; } } /** * * Numeric validate for Customizer * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_customize_validate_numeric' ) ) { function ulf_customize_validate_numeric( $validity, $value, $wp_customize ) { if ( ! is_numeric( $value ) ) { $validity->add( 'required', esc_html__( 'Please enter a valid number.', 'ulf' ) ); } return $validity; } } /** * * Required validate for Customizer * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_customize_validate_required' ) ) { function ulf_customize_validate_required( $validity, $value, $wp_customize ) { if ( empty( $value ) ) { $validity->add( 'required', esc_html__( 'This field is required.', 'ulf' ) ); } return $validity; } } /** * * URL validate for Customizer * * @since 1.0.0 * @version 1.0.0 * */ if ( ! function_exists( 'ulf_customize_validate_url' ) ) { function ulf_customize_validate_url( $validity, $value, $wp_customize ) { if ( ! filter_var( $value, FILTER_VALIDATE_URL ) ) { $validity->add( 'required', esc_html__( 'Please enter a valid URL.', 'ulf' ) ); } return $validity; } } Submit