过了一段时间，我发现了如何解决我的问题。

简而言之，我必须使用Javascript打开WP媒体上传程序。在我的选项中，我只保存附件ID。

这是我的代码：

HTML/PHP：

<?php 
    $options        = get_option( \'mysettings\' );
    $image_id       = esc_attr__( $options[\'image_id\']);
?>
<div id="logo"> 
<?php
    $hasImage       = false;
    $image          = wp_get_attachment_image_src( $image_id, \'medium\' );
    $image_url      = $image[0];
    if (!is_null($image_id) && $image_id !== "" && $image_id > 0) {
        $hasImage   = true;
    }
?>
    <div>
        <label for="image_url">Image</label>
        <input type="hidden" name="mysettings[image_id]" id="option_image_id" class="regular-text">
        <input id="upload_img-btn" type="button" name="upload-btn" class="button-secondary" value="Upload Image">
    </div>
    <div id="logo_container">
        <?php if ($hasImage) { ?>
        <img class="logo" src="<?php echo $image_url; ?>" />
        <?php } ?>
    </div>
    <input id="delete_img-btn" type="button" name="delete-btn" class="button-secondary" value="Remove Image" <?php if (!$hasImage) echo \'style="display: none;"\'; ?>>
</div>

jQuery(document).ready(function($) {

$("#delete_img-btn").on("click", function(e) {
    e.preventDefault();

    $(\'#logo_container\').html("");
    $("#delete_img-btn").hide();
});

$(\'#upload_img-btn\').on("click", function(e) {
    e.preventDefault();
    var $el = jQuery( this );
    var optionImageFrame = wp.media({ 
        title: $el.data( \'choose\' ),
        button: {
            text: $el.data( \'update\' )
        },
        states: [
            new wp.media.controller.Library({
                title: $el.data( \'choose\' ),
                filterable: \'all\',
                // mutiple: true if you want to upload multiple files at once
                multiple: false
            })
        ]           
    });

    optionImageFrame.on(\'select\', function(e){
        // This will return the selected image from the Media Uploader, the result is an object
        var uploaded_image = optionImageFrame.state().get(\'selection\').first();
        // We convert uploaded_image to a JSON object to make accessing it easier
        // Output to the console uploaded_image
        var attachment = uploaded_image.toJSON();
        var image_url = attachment.url;
        var image_id  = attachment.id;

        $(\'#option_image_id\').val(image_id);

        $(\'#logo_container\').append(\'<img class="logo" src="\' + image_url + \'" />\');
        $("#delete_img-btn").show();
    });
    optionImageFrame.open();
});
});