Sends CF7 Output to the error log - wherever that is

Debug Contact Form 7 Output

<?php 
// include in functions.php or in a plugin.  
// Use var_export, print_r, var_dump, whatever 

add_action( 'wpcf7_before_send_mail', 'he_debug_cf7_output'); 
function he_debug_cf7_output( $contact_form ) {
    $submission = WPCF7_Submission::get_instance();
    if ( $submission ) {
        $posted_data = $submission->get_posted_data();
        // Dump output to error log
        ob_start();
        var_export($posted_data);
        error_log(ob_get_clean());
    }
    return;
}