add_action to wp_head is added, but not called

Question

I'm using the CiviCRM plugin for WordPress, and in the plugin's main file, civicrm.php, it calls add_action() to add a function to wp_head() in order to merge CiviCRM's header with my theme's header:

add_action( 'wp_head', array( $this, 'wp_head' ) );

The actual function within civicrm.php is found below:

public function wp_head() {
  echo "calling wp_head"; //added by me to test if the code gets called
  // CRM-11823 - If Civi bootstrapped, then merge its HTML header with the CMS's header
  global $civicrm_root;
  if ( empty( $civicrm_root ) ) {
    return;
  }

  $region = CRM_Core_Region::instance('html-header', FALSE);
  if ( $region ) {
    echo '<!-- CiviCRM html header -->';
    echo $region->render( '' );
  }

}

I have confirmed that the code gets called when I switch to the twentyfifteen theme, but on my custom theme (which is based on an old version of Roots), this code does not get called. I have also confirmed that my custom theme is actually calling the main WordPress wp_head() function.

Any ideas on what could be going wrong in my custom theme that would cause this custom wp_head hook to not get called or otherwise error out in some way?

Answer 1

Can we think litter bit different way:

add_action('wp_head','new_wp_head');
function new_wp_head() {
  echo "calling wp_head"; 
  global $civicrm_root;
  if ( empty( $civicrm_root ) ) {
    return;
  }
  $region = CRM_Core_Region::instance('html-header', FALSE);
  if ( $region ) {
    echo '<!-- CiviCRM html header -->';
    echo $region->render( '' );
  }
}

Make sure in which file you put this and it's hook with your theme or plugins.

Answer 2

I figured out the issue:

When CiviCRM was applying the template in civicrm.basepage.php, $page_template was coming back as page.php, but my base template was actually named base.php.

I added the following code in my theme's initialization and it resolved the issue:

add_filter( 'civicrm_basepage_template', 'psca_civicrm_basepage_template' );
function psca_civicrm_basepage_template( $template ) {
  return 'base.php';
}