Project: Coaching Centre Website

<?php
/**
 * Plugin Name: Bright Coaching
 * Description: Courses, course levels and an enquiry form for Bright Future Coaching.
 * Version: 1.0.0
 * Requires at least: 6.6
 * Requires PHP: 8.0
 * Text Domain: bright-coaching
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

const BF_COURSE_FIELDS = [
    'course_fee'      => 'Fee (example: ₹18,000 per year)',
    'course_duration' => 'Duration (example: 10 months)',
    'course_timing'   => 'Batch timing (example: Mon to Fri, 4 to 6 pm)',
];

function bf_register_types() {
    register_post_type( 'course', [
        'labels'       => [ 'name' => 'Courses', 'singular_name' => 'Course', 'add_new_item' => 'Add New Course' ],
        'public'       => true,
        'has_archive'  => true,
        'rewrite'      => [ 'slug' => 'courses' ],
        'menu_icon'    => 'dashicons-welcome-learn-more',
        'supports'     => [ 'title', 'editor', 'thumbnail', 'excerpt' ],
        'show_in_rest' => true,
    ] );

    register_taxonomy( 'course_level', 'course', [
        'labels'            => [ 'name' => 'Levels', 'singular_name' => 'Level' ],
        'hierarchical'      => true,
        'show_admin_column' => true,
        'rewrite'           => [ 'slug' => 'level' ],
        'show_in_rest'      => true,
    ] );

    foreach ( array_keys( BF_COURSE_FIELDS ) as $key ) {
        register_post_meta( 'course', $key, [
            'type'              => 'string',
            'single'            => true,
            'show_in_rest'      => true,
            'sanitize_callback' => 'sanitize_text_field',
        ] );
    }

    register_post_type( 'bf_enquiry', [
        'labels'       => [ 'name' => 'Enquiries', 'singular_name' => 'Enquiry' ],
        'public'       => false,
        'show_ui'      => true,
        'menu_icon'    => 'dashicons-email-alt',
        'supports'     => [ 'title' ],
        'capabilities' => [ 'create_posts' => 'do_not_allow' ],
        'map_meta_cap' => true,
    ] );
}
add_action( 'init', 'bf_register_types' );

register_activation_hook( __FILE__, function () {
    bf_register_types();
    flush_rewrite_rules();
} );
register_deactivation_hook( __FILE__, 'flush_rewrite_rules' );

add_action( 'add_meta_boxes_course', function () {
    add_meta_box( 'bf_course_details', 'Course details', 'bf_course_box', 'course', 'side' );
} );

function bf_course_box( $post ) {
    wp_nonce_field( 'bf_save_course', 'bf_course_nonce' );
    foreach ( BF_COURSE_FIELDS as $key => $label ) {
        printf(
            '<p><label for="%1$s">%2$s</label><br><input type="text" class="widefat" id="%1$s" name="%1$s" value="%3$s"></p>',
            esc_attr( $key ),
            esc_html( $label ),
            esc_attr( get_post_meta( $post->ID, $key, true ) )
        );
    }
}

add_action( 'save_post_course', function ( $post_id ) {
    $nonce = isset( $_POST['bf_course_nonce'] ) ? sanitize_text_field( wp_unslash( $_POST['bf_course_nonce'] ) ) : '';
    if ( ! wp_verify_nonce( $nonce, 'bf_save_course' ) ) {
        return;
    }
    if ( wp_is_post_autosave( $post_id ) || ! current_user_can( 'edit_post', $post_id ) ) {
        return;
    }
    foreach ( array_keys( BF_COURSE_FIELDS ) as $key ) {
        if ( isset( $_POST[ $key ] ) ) {
            update_post_meta( $post_id, $key, sanitize_text_field( wp_unslash( $_POST[ $key ] ) ) );
        }
    }
} );

<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
<main class="wp-block-group">
  <!-- wp:post-title {"level":1} /-->
  <!-- wp:post-terms {"term":"course_level"} /-->
  <!-- wp:post-featured-image /-->

  <!-- wp:group {"layout":{"type":"flex","flexWrap":"nowrap"}} -->
  <div class="wp-block-group">
    <!-- wp:paragraph --><p><strong>Fee:</strong></p><!-- /wp:paragraph -->
    <!-- wp:paragraph {"metadata":{"bindings":{"content":{"source":"core/post-meta","args":{"key":"course_fee"}}}}} --><p></p><!-- /wp:paragraph -->
  </div>
  <!-- /wp:group -->

  <!-- wp:post-content /-->

  <!-- wp:buttons -->
  <div class="wp-block-buttons"><!-- wp:button -->
  <div class="wp-block-button"><a class="wp-block-button__link wp-element-button" href="/contact/">Enquire about this course</a></div>
  <!-- /wp:button --></div>
  <!-- /wp:buttons -->
</main>
<!-- /wp:group -->
<!-- wp:template-part {"slug":"footer","tagName":"footer"} /-->

add_shortcode( 'bf_enquiry_form', function () {
    if ( isset( $_GET['enquiry'] ) && 'sent' === $_GET['enquiry'] ) {
        return '<p class="bf-thanks">Thank you! Our office will call you within one working day.</p>';
    }

    $courses = get_posts( [ 'post_type' => 'course', 'numberposts' => 50, 'orderby' => 'title', 'order' => 'ASC' ] );

    ob_start();
    ?>
    <form class="bf-enquiry" method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>">
        <input type="hidden" name="action" value="bf_enquiry">
        <?php wp_nonce_field( 'bf_enquiry', 'bf_nonce' ); ?>
        <p><label>Student name<br><input type="text" name="bf_name" maxlength="80" required></label></p>
        <p><label>Parent's mobile number<br><input type="tel" name="bf_phone" pattern="[0-9 ]{10,12}" required></label></p>
        <p><label>Course<br>
            <select name="bf_course">
                <option value="0">Not sure yet</option>
                <?php foreach ( $courses as $course ) : ?>
                    <option value="<?php echo esc_attr( $course->ID ); ?>"><?php echo esc_html( $course->post_title ); ?></option>
                <?php endforeach; ?>
            </select>
        </label></p>
        <p hidden><label>Leave this empty <input type="text" name="bf_website" tabindex="-1" autocomplete="off"></label></p>
        <p><small>We use these details only to call you about admissions. See our Privacy Policy.</small></p>
        <p><button type="submit">Request a call back</button></p>
    </form>
    <?php
    return ob_get_clean();
} );

function bf_handle_enquiry() {
    $nonce = isset( $_POST['bf_nonce'] ) ? sanitize_text_field( wp_unslash( $_POST['bf_nonce'] ) ) : '';
    if ( ! wp_verify_nonce( $nonce, 'bf_enquiry' ) ) {
        wp_die( 'This form has expired. Please go back, reload the page and try again.' );
    }
    if ( ! empty( $_POST['bf_website'] ) ) {
        wp_die( 'Spam detected.' );
    }

    $name      = sanitize_text_field( wp_unslash( $_POST['bf_name'] ?? '' ) );
    $phone     = preg_replace( '/\D/', '', wp_unslash( $_POST['bf_phone'] ?? '' ) );
    $course_id = absint( $_POST['bf_course'] ?? 0 );

    if ( '' === $name || 10 !== strlen( $phone ) ) {
        wp_die( 'Please enter the student name and a 10-digit mobile number.' );
    }

    $course = 'Not sure yet';
    if ( $course_id && 'course' === get_post_type( $course_id ) && 'publish' === get_post_status( $course_id ) ) {
        $course = get_the_title( $course_id );
    }

    $enquiry_id = wp_insert_post( [
        'post_type'   => 'bf_enquiry',
        'post_status' => 'private',
        'post_title'  => $name,
        'meta_input'  => [ 'bf_phone' => $phone, 'bf_course' => $course ],
    ] );

    wp_mail(
        get_option( 'admin_email' ),
        'New enquiry: ' . $name,
        "Student: $name\nMobile: $phone\nCourse: $course\nEnquiry ID: $enquiry_id"
    );

    $back = wp_get_referer() ?: home_url( '/' );
    wp_safe_redirect( add_query_arg( 'enquiry', 'sent', $back ) );
    exit;
}
add_action( 'admin_post_nopriv_bf_enquiry', 'bf_handle_enquiry' );
add_action( 'admin_post_bf_enquiry', 'bf_handle_enquiry' );

add_filter( 'manage_bf_enquiry_posts_columns', function ( $columns ) {
    return [
        'cb'        => $columns['cb'],
        'title'     => 'Student',
        'bf_phone'  => 'Mobile',
        'bf_course' => 'Course',
        'date'      => 'Received',
    ];
} );

add_action( 'manage_bf_enquiry_posts_custom_column', function ( $column, $post_id ) {
    if ( in_array( $column, [ 'bf_phone', 'bf_course' ], true ) ) {
        echo esc_html( get_post_meta( $post_id, $column, true ) );
    }
}, 10, 2 );

wp post list --post_type=bf_enquiry --post_status=private --fields=ID,post_title,post_date