使用以下代码，我试图使用WordPress媒体API仅允许上载/选择某些图像类型。所以我在upload\\u mimes上使用add\\u filter来限制允许的mime类型。使用get\\u allowed\\u mime\\u types（）可以得到一个仅包含所需mime类型的数组。但是，当我单击“更改图像”按钮时，我仍然可以上载以前未列出的mime类型的文件（如PDF）。我做错了什么？

public static function file_uploader( $element_id = null, $multiple = true )
{
    add_filter( \'upload_mimes\', array( \'JBLAB_Utils\', \'images_upload_mimes\' ) );
    var_dump( get_allowed_mime_types() );
    /**
     * outputs:
     *  array(3) {
     *      ["jpg|jpeg|jpe"]=>
     *          string(10) "image/jpeg"
     *      ["gif"]=>
     *          string(9) "image/gif"
     *      ["png"]=>
     *          string(9) "image/png"
     *  }
     */

    $multiple = ( $multiple === true ) ? \'true\' : \'false\';
    wp_enqueue_script(\'jquery\');
    wp_enqueue_media();     
    ?>
    <div>
    <?php
    if ( empty( $element_id ) )
    {
        $element_id = "jblab_uploaded_file_url";
        ?>
        <label for="jblab_uploaded_file_url"><?php _e( \'Image\', \'jblab-radionomy\' ); ?></label>
        <input type="text" name="jblab_uploaded_file_url" id="jblab_uploaded_file_url" class="regular-text">
        <?php
    }
    ?>
        <input type="button" name="jblab_upload_file_upload_btn" id="jblab_upload_upload_btn" class="button-secondary" value="<?php _e( \'Change Image\', \'jblab-radionomy\' ); ?>">
    </div>
    <script type="text/javascript">
        jQuery(document).ready(function($){
            $(\'#jblab_upload_upload_btn\').click(function(e) {
                e.preventDefault();
                var image = wp.media({ 
                    title: \'<?php echo str_replace( "\'", "\\\'", __( \'Change Image\', \'jblab-radionomy\' ) ); ?>\',
                    multiple: <?php echo $multiple; ?>
                }).open()
                .on(\'select\', function(e){
                    var uploaded_image = image.state().get(\'selection\').first();
                    var image_url = uploaded_image.toJSON().url;
                    <?php
                    echo "
                    if ($(\'#$element_id\').is(\'img\')) {
                        $(\'#$element_id\').attr(\'src\',image_url);
                    } else {
                        $(\'#$element_id\').val(image_url);
                    }
                    ";
                    ?>
                });
            });
        });
    </script>
    <?php
}   
public static function images_upload_mimes ( $mimes = array() )
{
    //unset( $mimes );
    $mimes = array(
        \'jpg|jpeg|jpe\' => \'image/jpeg\',
        \'gif\' => \'image/gif\',
        \'png\' => \'image/png\',
    );
    return $mimes;
}