Append USER ID to an outbound link?

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Please bear with me as I am a newbie. Is there a way to append a USER ID aka a logged-in user's ID to any external link. For example, a logged-in user clicks a link, the link then appends that user's ID. I've tried WP current user, but have had issues getting that USER ID to get on my report.

Please bear with me as I am a newbie. Is there a way to append a USER ID aka a logged-in user's ID to any external link. For example, a logged-in user clicks a link, the link then appends that user's ID. I've tried WP current user, but have had issues getting that USER ID to get on my report.

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Share Improve this question asked Jan 9, 2020 at 16:11 Todd LTodd L 11 3

• We don't see any little piece of code you've used to append the user ID. We can't figure out the problem with the code since all our mediums are on holidays now. – Max Yudin Commented Jan 9, 2020 at 17:23
• 1 Welcome to WPSE! Can you add some context? It would be good to know the problem this solves, are you using this for analytics purposes? – Tom J Nowell ♦ Commented Jan 9, 2020 at 17:26
• So i added the link manually on a wordpress page like this <a href="welcomehome.com&aff_sub=?user_id=<?php echo get_current_user_id(); ?"> ... the result ended on the reporting side: "?php echo get_current_user_id(); ?" so at least it read the brackets but it's intended use was not there. (a test user ID) – Todd L Commented Jan 9, 2020 at 18:06

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1 Answer 1

Sorted by: Reset to default 0

You should be able to use get_current_user_id(). Note that it will return '0' if the user isn't logged in.

<a href="https://example.com/?user_id=<?php echo get_current_user_id(); ?>">Link</a>

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Update 2: Got bored, made a plugin: https://github.com/AndyMardell/append-user-id/releases/tag/v1.0.0-alpha

Download the zip and install :) Submitted to WordPress but it's still under review.

Installation and Usage: https://github.com/AndyMardell/append-user-id#installation

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Update: you won't be able to do this without PHP. But hear me out...

1) Add the following PHP to your theme's functions.php file:

function prefix_get_current_user_id( $atts, $content, $tag ) {
    $atts        = array_change_key_case( (array) $atts, CASE_LOWER );
    $prefix_atts = shortcode_atts(
        array( 'url' => '' ),
        $atts,
        $tag
    );

    if ( is_user_logged_in() ) {
        $a_open = sprintf(
            '<a href="%s?user_id=%s">',
            esc_url( $prefix_atts['url'] ),
            get_current_user_id()
        );
        return $a_open . esc_html( $content ) . '</a>';
    }

    $a_open = sprintf(
        '<a href="%s">',
        esc_url( $prefix_atts['url'] )
    );

    return $a_open . esc_html( $content ) . '</a>';
}

function prefix_add_shortcodes() {
    add_shortcode( 'link_with_id', 'prefix_get_current_user_id' );
}
add_action( 'init', 'prefix_add_shortcodes' );

2) Edit your post/page content and add the following shortcode:

[link_with_id url="https://domain.com/link"]A link to a page[/link_with_id]

This will output the following html:

<a href="https://domain.com/link?user_id=1">A link to a page</a>

or if the user isn't logged in, it will output:

<a href="https://domain.com/link">A link to a page</a>

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