I'm almost finished the re-skin and development of a customer site, and one of the final items I need to build support for is the audio shortcode they're using. The problem I'm having is that the audio shortcode does not use an attribute, but has an attribute value:


How do I render this on the page?

I would use the following function, but there is no attribute in the above shortcode:

function audio_shortcode($atts) {
    $a = shortcode_atts( array(
        'uri' => ''
    ), $atts);

    return '<audio controls><source src="' . $a['uri'] . '" type="audio/mpeg"></audio>';
add_shortcode('mp3audio', 'audio_shortcode');

I reviewed the documentation here: https://codex.wordpress.org/Shortcode_API but it doesn't have any examples here [scode="value"].

Any suggestions on how to proceed?


When no attribute is used but a value is provided, the value is added to $atts[0]. Using $atts[0], I'm now able to get the value output doing the following:

function audio_shortcode($atts) {
    if($atts[0] != '') {
        return '
            <div class="audiofile">
                <audio controls>
                    <source src="' . $atts[0] . '" type="audio/mpeg">
add_shortcode('audio', 'audio_shortcode');

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