wp_pluging

<?php
/*
    Plugin Name:    MyBBCode
    Version:    1.0.0
    Description:    Implements du bbCode Personnel
    Author:     VILLERS Mickael
 */
class MyBBCode {
    function __construct() {
        if ( !function_exists('add_shortcode') ) return;

        add_shortcode( 'b' , array(&$this, 'shortcode_bold') );
        add_shortcode( 'i' , array(&$this, 'shortcode_italics') );
        add_shortcode( 'u' , array(&$this, 'shortcode_underline') );
        add_shortcode( 'infobulle' , array(&$this, 'shortcode_url') );
    }

    function shortcode_bold( $atts = array(), $content = NULL ) {
        return '<strong>' . do_shortcode( $content ) . '</strong>';
    }

    function shortcode_italics( $atts = array(), $content = NULL ) {
        return '<em>' . do_shortcode( $content ) . '</em>';
    }

    function shortcode_underline( $atts = array(), $content = NULL ) {
        return '<span style="text-decoration:underline">' . do_shortcode( $content ) . '</span>';
    }

    function shortcode_url( $atts = array(), $content = NULL ) {
        $attribut = substr($atts[0], 1);
            $array = explode("|", $content);
            $content = (isset($array[1])) ? $array[1] : $attribut;

            return '<a href="'.$attribut.'" title="'.$array[0].'">'.do_shortcode($content).'</a>';
    }

}
add_action( 'plugins_loaded', create_function( '', 'global $BBCode; $BBCode = new MyBBCode();' ) );

?>