Count the number of times a WordPress shortcode is used in a post

问题

I have the following WordPress shortcode function:

function wp_shortcode() {
 static $i=1;
 $return = '['.$i.']';
 $i++;
 return $return;
}
add_shortcode('shortcode', 'wp_shortcode');

This works fine. The $i variable gets incremented each time the function is called in the article. So for

[shortcode][shortcode][shortcode][shortcode]

the output is as expected

[1][2][3][4]

but

if the article has more than one page, than the counter resets on the next article page. So for:

[shortcode][shortcode][shortcode][shortcode]
<!--nextpage-->
[shortcode][shortcode][shortcode][shortcode]

the output is

[1][2][3][4]
<!--nextpage-->
[1][2][3][4]

instead of the wanted output of:

[1][2][3][4]
<!--nextpage-->
[5][6][7][8]

Anyway to change this?

回答1:

So after researching a bit more @diggy's idea with pre processing the_content and adding the $atts to the shorcodes before the shortcodes are rendered, I came up with this:

function my_shortcode_content( $content ) {
 //check to see if the post has your shortcode, skip do nothing if not found
 if( has_shortcode( $content, 'shortcode' ) ):

  //replace any shortcodes to the basic form ([shortcode 1] back to [shortcode])
  //usefull when the post is edited and more shortcodes are added
  $content = preg_replace('/shortcode .]/', 'shortcode]', $content);

  //loop the content and replace the basic shortcodes with the incremented value
  $content = preg_replace_callback('/shortocode]/', 'rep_count', $content);

 endif;

return $content;
}
add_filter( 'content_save_pre' , 'my_shortcode_content' , 10, 1);

function rep_count($matches) {
 static $i = 1;
return 'shortcode ' . $i++ .']';
}

回答2:

Nice question. A possible solution below, however not exactly elegant because it requires you to have a fixed number of shortcodes on each page, e.g. 4:

add_shortcode( 'shortcode', 'wp_shortcode' );
function wp_shortcode() {
    global $page;
    $spp = 4;
    static $i = 1;
    $ii = $i + ( ( $page - 1 ) * $spp );
    $return = '<a href="#f'.$ii.'" name="r'.$ii.'">['.$ii.']</a>';
    $i++;
    return $return;
}

回答3:

It is happens, because on every page load you redefined your function, so static $i=1; will executed always.

Maybe you want to use a $_SESSION variable. But do not forget the session_start() somewhere in init callback.

function wp_shortcode() {
    if (empty($_SESSION["myCounter"])) {
        $_SESSION["myCounter"] = 1;
    }
    $return = '<a href="#f' . $_SESSION["myCounter"] . '" name="r' 
        . $_SESSION["myCounter"] . '">[' 
        . $_SESSION["myCounter"] . ']</a>';
    $_SESSION["myCounter"]++;
    return $return;
}
add_shortcode('shortcode', 'wp_shortcode');

Setting the session, put it into the functions.php

add_action('init', 'my_init');
function my_init() {
    if (!session_id()) {
        session_start();
    }
    //Other init here
}

回答4:

If you need to just count the total tags in a page/post you can use this:

function count_shortcodes( $content, $tag ) {
    if ( false === strpos( $content, '[' ) ) {
        return 0;
    }

    if ( shortcode_exists( $tag ) ) {
        preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
        if ( empty( $matches ) )
            return 0;

        $count = 0;
        foreach ( $matches as $shortcode ) {
            if ( $tag === $shortcode[2] ) {
                $count++;
            } elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
                $count++;
            }
        }

        return $count;
    }
    return 0;
}

来源：https://stackoverflow.com/questions/27507320/count-the-number-of-times-a-wordpress-shortcode-is-used-in-a-post

标签

php

wordpress

shortcode