// ────────────────────────────────────────────────────────────────────────
// OCR Labels Report + “Clear All” button
// ────────────────────────────────────────────────────────────────────────

// 1) Add submenu under “Images”
add_action( 'admin_menu', function(){
    add_submenu_page(
        'edit.php?post_type=image',  // parent slug
        'OCR Labels',                // page title
        'OCR Labels',                // menu title
        'manage_options',            // capability
        'image-ocr-labels',          // menu slug
        'stoxo_render_ocr_report'    // callback
    );
}, 20 );

// 2) Render the OCR report table
function stoxo_render_ocr_report() {
    // Handle “Clear All” form submission
    if ( isset( $_POST['stoxo_clear_ocr'] ) && check_admin_referer( 'stoxo_clear_ocr_action', 'stoxo_clear_ocr_nonce' ) ) {
        delete_post_meta_by_key( '_ocr_labels' );
        echo '<div class="notice notice-success is-dismissible"><p>All OCR labels cleared.</p></div>';
    }

    // Fetch only ‘image’ posts whose _ocr_labels meta exists and is not empty
    $ocrged = get_posts([
        'post_type'      => 'image',
        'posts_per_page' => -1,
        'meta_query'     => [
            [
                'key'     => '_ocr_labels',
                'compare' => 'EXISTS',
            ],
            [
                'key'     => '_ocr_labels',
                'value'   => '',
                'compare' => '!=',
            ],
        ],
    ]);

    // Header / Clear Form
    echo '<div class="wrap">';
    echo '<h1>OCR Labels (' . count( $ocrged ) . ')</h1>';
    echo '<form method="post" style="margin-bottom:1em;">';
      wp_nonce_field( 'stoxo_clear_ocr_action', 'stoxo_clear_ocr_nonce' );
      echo '<input type="submit" name="stoxo_clear_ocr" class="button button-secondary" value="Clear All OCR Labels" onclick="return confirm(\'Are you sure you want to delete all OCR labels?\')" />';
    echo '</form>';

    // Table start
    echo '<table class="widefat fixed striped">';
    echo '<thead><tr>';
      echo '<th width="160">Thumbnail</th>';
      echo '<th width="60">ID</th>';
      echo '<th>Title</th>';
      echo '<th>OCR Text</th>';
      echo '<th width="120">Actions</th>';
    echo '</tr></thead><tbody>';

    if ( empty( $ocrged ) ) {
        echo '<tr><td colspan="5" style="text-align:center;">No OCR labels found.</td></tr>';
    } else {
        foreach ( $ocrged as $p ) {
            $thumb = has_post_thumbnail( $p->ID )
                ? get_the_post_thumbnail( $p->ID, [150,150], [
                      'style' => 'width:100px;height:100px;object-fit:cover;border:1px solid #ccc;',
                  ] )
                : '<div style="width:100px;height:100px;line-height:100px;text-align:center;border:1px solid #ccc;color:#999;font-size:12px;">No Image</div>';

            $text = get_post_meta( $p->ID, '_ocr_labels', true );
            $edit_link  = esc_url( admin_url( 'post.php?post=' . $p->ID . '&action=edit' ) );
            $trash_link = esc_url( get_delete_post_link( $p->ID ) );

            echo '<tr>';
              echo '<td>' . $thumb . '</td>';
              echo '<td>' . intval( $p->ID ) . '</td>';
              echo '<td>' . esc_html( get_the_title( $p->ID ) ) . '</td>';
              echo '<td><pre style="white-space:pre-wrap;word-break:break-word;">' . esc_html( $text ) . '</pre></td>';
              echo '<td>';
                echo '<a class="button button-small" href="' . $edit_link  . '">Edit</a> ';
                echo '<a class="button button-small" href="' . $trash_link . '" onclick="return confirm(\'Move this OCR entry’s image to Trash?\')">Trash</a>';
              echo '</td>';
            echo '</tr>';
        }
    }

    echo '</tbody></table>';
    echo '</div>';
}
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wp-content/mu-plugins/ocr-scan.php:1) in <b>/var/www/html/wp-includes/pluggable.php</b> on line <b>1450</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wp-content/mu-plugins/ocr-scan.php:1) in <b>/var/www/html/wp-includes/pluggable.php</b> on line <b>1453</b><br />