方法#1

如果可用，我将使用：

shortcode_atts_{$shortcode}

筛选以收集给定短代码的属性。

Example:

$text = \'
    [gallery]
    [gallery ids="1,2" link="file"]
    [gallery ids="3"]
    [caption id="attachment_6" align="alignright" width="300"]
\';

if( class_exists( \'WPSE_CollectShortcodeAttributes\' ) )
{
    $o = new WPSE_CollectShortcodeAttributes;
    $out = $o->init( $shortcode = \'gallery\', $text )->get_attributes();
    print_r( $out );
}

其中，我们的助手类定义为：

class WPSE_CollectShortcodeAttributes
{
    private $text      = \'\';
    private $shortcode = \'\';
    private $atts      = array();

    public function init( $shortcode = \'\', $text = \'\' )
    {
        $this->shortcode = esc_attr( $shortcode );
        if( shortcode_exists( $this->shortcode ) 
            && has_shortcode( $text, $this->shortcode ) 
        )
        {
            add_filter( "shortcode_atts_{$this->shortcode}", 
                array( $this, \'collect\' ), 10, 3 );
            $this->text = do_shortcode( $text );
            remove_filter( "shortcode_atts_{$this->shortcode}", 
                array( $this, \'collect\' ), 10 );
        }
        return $this;
    }

    public function collect( $out, $pair, $atts )
    {
        $this->atts[] = $atts;
        return $out;
    }

    public function get_attributes()
    {
        return $this->atts;
    }
}

我们示例的输出是：

Array
(
    [0] => Array
        (
            [0] => 
        )

    [1] => Array
        (
            [ids] => 1,2
            [link] => file
            [orderby] => post__in
            [include] => 1,2
        )

    [2] => Array
        (
            [ids] => 3
            [orderby] => post__in
            [include] => 3
        )

)

所以对于gallery shortcode，我们还获得了一些额外的属性。

方法#2

但并非所有短代码都支持上述过滤器。在这种情况下，您可以尝试以下操作：

/**
 * Grab all attributes for a given shortcode in a text
 *
 * @uses get_shortcode_regex()
 * @uses shortcode_parse_atts()
 * @param  string $tag   Shortcode tag
 * @param  string $text  Text containing shortcodes
 * @return array  $out   Array of attributes
 */

function wpse172275_get_all_attributes( $tag, $text )
{
    preg_match_all( \'/\' . get_shortcode_regex() . \'/s\', $text, $matches );
    $out = array();
    if( isset( $matches[2] ) )
    {
        foreach( (array) $matches[2] as $key => $value )
        {
            if( $tag === $value )
                $out[] = shortcode_parse_atts( $matches[3][$key] );  
        }
    }
    return $out;
}

Example:

$text = \'
    [gallery]
    [gallery ids="1,2" link="file"]
    [gallery ids="3"]
    [caption id="attachment_6" align="alignright" width="300"][/caption]
\';
$out = wpse172275_get_all_attributes( \'gallery\', $text );
print_r( $out );

输出：

Array
(
    [0] => 
    [1] => Array
        (
            [ids] => 1,2
            [link] => file
        )

    [2] => Array
        (
            [ids] => 3
        )

)

我希望你能根据自己的需要修改这个。