Uninitialized string offset notice
<p>The following function is giving the notice:</p>

<p>This gives the notice on the <code>list</code> line:</p>

<pre><code>Notice: Uninitialized string offset: 0
</code></pre>

<p>What is causing that notice?</p>

<pre><code>function hex2rgb( $colour ) {
        if ( $colour[0] == '#' ) {
                $colour = substr( $colour, 1 );
        }
        if ( strlen( $colour ) == 6 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[1], $colour[2] . $colour[3], $colour[4] . $colour[5] );
        } elseif ( strlen( $colour ) == 3 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[0], $colour[1] . $colour[1], $colour[2] . $colour[2] );
        } else {
                return false;
        }
        $r = hexdec( $r );
        $g = hexdec( $g );
        $b = hexdec( $b );
        return array( 'red' =&gt; $r, 'green' =&gt; $g, 'blue' =&gt; $b );
}
</code></pre>
