在插入帖子之前裁剪图像

我有一个前端帖子表单，我一直在使用这个PHP代码来允许上传一个图像并将其插入帖子。

    // image upload and attatching to post
    if ( ! empty( $_FILES ) && ! empty( $_FILES[\'upload-image\'][\'name\'] ) ) {

        // upload image to server
        $upload = wp_upload_bits( $_FILES[\'upload-image\'][\'name\'], null, file_get_contents( $_FILES[\'upload-image\'][\'tmp_name\'] ) );

        // insert new image to the just created post ================================
        $wp_filetype = wp_check_filetype( basename( $upload[\'file\'] ), null );
        $wp_upload_dir = wp_upload_dir();

        $attachment = array(
            \'guid\'           => $wp_upload_dir[\'baseurl\'] . _wp_relative_upload_path( $upload[\'file\'] ),
            \'post_mime_type\' => $wp_filetype[\'type\'],
            \'post_title\'     => preg_replace(\'/\\.[^.]+$/\', \'\', basename( $upload[\'file\'] )),
            \'post_content\'   => \'\',
            \'post_status\'    => \'inherit\'
        );
        $attach_id = wp_insert_attachment( $attachment, $upload[\'file\'], $post_id );

        require_once(ABSPATH . \'wp-admin/includes/image.php\');

        $attach_data = wp_generate_attachment_metadata( $attach_id, $upload[\'file\'] );      
        wp_update_attachment_metadata( $attach_id, $attach_data );
        update_post_meta( $post_id, \'_thumbnail_id\', $attach_id );
        // end insert ==============================================

    }

如何确保在将所有图像插入帖子之前，将其裁剪为16:9的纵横比？因此，如果图像的高度太高，它会将顶部和底部裁剪成16:9的比例，如果图像的宽度太宽，它会将侧面裁剪成16:9的比例。

我在这里找到了一个函数，它总是将图像裁剪成16:9的比例，我可以根据这个比例进行计算：https://stackoverflow.com/questions/29063094/php-fit-any-size-image-to-169-aspect-ratio （未测试）。但我不知道如何在我上面的代码中使用它-16:9的比例图像需要在插入帖子之前准备好。

感谢您的帮助。

File: wp-includes/media.php 256: /** 257: * Register a new image size. 258: * 259: * Cropping behavior for the image size is dependent on the value of $crop: 260: * 1. If false (default), images will be scaled, not cropped. 261: * 2. If an array in the form of array( x_crop_position, y_crop_position ): 262: * - x_crop_position accepts \'left\' \'center\', or \'right\'. 263: * - y_crop_position accepts \'top\', \'center\', or \'bottom\'. 264: * Images will be cropped to the specified dimensions within the defined crop area. 265: * 3. If true, images will be cropped to the specified dimensions using center positions. 266: * 267: * @since 2.9.0 268: * 269: * @global array $_wp_additional_image_sizes Associative array of additional image sizes. 270: * 271: * @param string $name Image size identifier. 272: * @param int $width Image width in pixels. 273: * @param int $height Image height in pixels. 274: * @param bool|array $crop Optional. Whether to crop images to specified width and height or resize. 275: * An array can specify positioning of the crop area. Default false. 276: */ 277: function add_image_size( $name, $width = 0, $height = 0, $crop = false ) { 278: global $_wp_additional_image_sizes; 279: 280: $_wp_additional_image_sizes[ $name ] = array( 281: \'width\' => absint( $width ), 282: \'height\' => absint( $height ), 283: \'crop\' => $crop, 284: ); 285: }

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