http://boiteaweb.fr/plugin_row_meta-hook-semaine-7589.html

plugin_multi_authors.php

add_filter( 'plugin_row_meta', 'pastacode_plugin_row_meta', 10, 2 );
function pastacode_plugin_row_meta( $plugin_meta, $plugin_file )
{
    if( plugin_basename( __FILE__ ) == $plugin_file ){
        $last = end( $plugin_meta );
        $plugin_meta = array_slice( $plugin_meta, 0, -2 );
        $a = array();
        $authors = array(
            array(  'name'=>'Willy Bahaud', 'url'=>'http://www.wabeo.fr' ),
            array(  'name'=>'Julio Potier', 'url'=>'http://www.boiteaweb.fr' ),
        );
        foreach( $authors as $author )
            $a[] = '<a href="' . $author['url'] . '" title="' . esc_attr__( 'Visit author homepage' ) . '">' . $author['name'] . '</a>';
        $a = sprintf( __( 'By %s' ), wp_sprintf( '%l', $a ) );
        $plugin_meta[] = $a;
        $plugin_meta[] = $last;
    }
    return $plugin_meta;
}