Question

I have the following code in PHP:

<?php if (function_exists("insert_audio_player")) {insert_audio_player("[audio:|titles=]"} ?>

Which renders an audio player to my page in WordPress. I need to call a custom field inside this code. My custom field code is also coded in PHP:

<?php print_custom_field('tc_filename'); ?>

Something like:

<?php if (function_exists("insert_audio_player")) {insert_audio_player("[audio:<?php print_custom_field('tc_filename'); ?>|titles=<?php print_custom_field('tc_title'); ?>]"} ?>

How can I use or integrate the second block of code with the first?

Answer 1

<?php 
if (function_exists("insert_audio_player")) {
    insert_audio_player("[audio:".print_custom_field('tc_filename')."|titles=".print_custom_field('tc_title')."]"
} ?>

You can make this easier to read using sprintf()

<?php 
if (function_exists("insert_audio_player")) {
    insert_audio_player(sprintf(
        '[audio:%s|titles=%s]', 
        print_custom_field('tc_filename'), 
        print_custom_field('tc_title')
    ));
} 
?>    

Edit: based on your comment, the print_custom_field actually echo’s the field, and doesn’t return it, if there is no return function you can use, you need to use Output Buffering.

You can use a new function, which calls the print function but returns it instead of printing it to the screen:

function get_custom_field($field) {
    ob_start();
    print_custom_field($field);
    return ob_get_clean();
}

And use

<?php 
if (function_exists("insert_audio_player")) {
    insert_audio_player(sprintf(
        '[audio:%s|titles=%s]', 
        get_custom_field('tc_filename'), 
        get_custom_field('tc_title')
    ));
} 
?>