I modified a little script I found inside a plugin named “bbp signature” https://wordpress.org/plugins/bbp-signature/
That plugin actually does not work with Buddypress, it is a bbpress plugin
[modified by moderator]

But the code wasn’t too terrible. even though I only kept a few line of it.

So here’s the solution;

make sure you have buddypress with xprofile enabled *(extended profiles)

1. Create a new text box field in Xprofile and name it “Signature”. *(caps is important, no quotation mark.)

Then add that code to the function.php of your child theme.

//Add Signature

function bbp_reply_content_append_user_signature( $content = '', $reply_id = 0, $args = array() ) {
	// Default arguments
	$defaults = array(
		'separator' => '<hr />',
		'before'    => '<div class="bbp-signature">',
		'after'     => '</div>'
	);
	$r = wp_parse_args( $args, $defaults );
	extract( $r );

	// Verify topic id, get author id, and potential signature
	$reply_id  = bbp_get_reply_id       ( $reply_id );
	$user_id   = bbp_get_reply_author_id( $reply_id );
	$signature = xprofile_get_field_data( 'Signature', $user_id );

	// If signature exists, adjust the content accordingly
	if ( !empty( $signature ))
		$content = $content . $separator . $before . $signature . $after;

	return apply_filters( 'bbp_reply_content_append_signature', $content, $reply_id, $separator );
}

add_filter( 'bbp_get_reply_content', 'bbp_reply_content_append_user_signature', 1, 2 );

That’s it !

PS. If you want to enable HTML in xprofile there is a way but it’s risky.
you can read about it here : https://buddypress.org/support/topic/html-in-profile-field-again/

[@patrix87 Participant 9 years, 6 months ago]

Safer way to allow img tag :

simply add that to your function.php

// Add img tag to filter

function gawd_allowed_tags() {
	global $allowedtags;
	$allowedtags['img'] = array( 'src' => array () );
}

add_action('init', 'gawd_allowed_tags', 10);

[@robkk Moderator 9 years, 6 months ago]

I think that plugin works best without BuddyPress installed.

Thanks for sharing though.

[@patrix87 Participant 9 years, 6 months ago]

I think it was made to work with buddypress groups whitout xprofiles yes. A simple update could fix that.

[@fabwintle Participant 9 years, 6 months ago]

@patri87

THANK YOU! I have been struggling with this plugin and just did a bit more googling and bam, here ws your post. I really appreciate you posting this fix.

[@rajkumarsam786 Participant 9 years, 6 months ago]

Thank you for solution

[@robin-w Moderator 9 years, 6 months ago]

The bbp-signature plugin is designed to work with bbpress not with buddypress, so it works fine – I’ve amended your original post to reflect that for future users in the first post to save them needing to read the whole thread.

But the code wasn't too terrible

General open software etiquette is not to insult other software authors, we are all at different levels and any software that works is useful 🙂

The original author of this software is unable to continue supporting it, so I have access to it so that it can continue.

I think it was made to work with buddypress groups whitout xprofiles yes. A simple update could fix that.

If you’d care to suggest code that would make it work for users with and without buddypress, please contact me via my website, as I’d love to include it in the plugin

http://www.rewweb.co.uk

[@patrix87 Participant 9 years, 6 months ago]

Sorry about that, I did not intend to insult anyone, French is my first language and maybe that sound worst that I intended it to be.

For the update you could add a line to check for buddypress xprofiles and check this field instead of the bbpress one :

xprofile_get_field_data( 'Signature', $user_id );

sorry again about that.

[@robin-w Moderator 9 years, 6 months ago]

hey no problem !

[@fabwintle Participant 8 years, 6 months ago]

Thanks very much for this @patrix87.

I would like to add <br/> or at least customise that signature a little bit. I don’t need an html editor in there, but just be able to add elements on different lines. What do you recommend I use?

[@ghoush Participant 5 years, 2 months ago]

Just a note to everyone who might find this. It’s been more than 4 years, and this code still works great.

For anyone looking to add signatures on BuddyBoss Platform instead of bbPress/BuddyPress, this works too.

[@robin-w Moderator 5 years, 2 months ago]

great! thanks for posting