Wordpress - ACF - Adds all the fields with default values to the Post Meta for Advanced Custom Fields

acf_set_default.php

/**
 * Sets the ACF Fields for the specified post
 * @param int $post_id
 * @param string $post_type
 */
function set_post_defaults_acf($post_id=0,$post_type='') {
	if ($post_id &&
		   $post_type &&
		   function_exists('update_field')
	) {

		// Get field groups for this post type and id.
		$field_groups = acf_get_field_groups(array(
			'post_id'	=> $post_id,
			'post_type'	=> $post_type
		));

		// Loop through the field groups
		foreach ($field_groups as $field_group) {

			// Get all fields associated wiht this group
			$fields = acf_get_fields($field_group);
			if ($fields) {

				// loop through each field
				foreach ($fields as $field) {

					// Grab our needed values
					$key_id = $field['key'] ?? false;
					$name = $field['name'] ?? false;
					$default = $field['default_value'] ?? false;

					// Only apply to fields that have a name value (skips tabs etc)
					if ($key_id && $name) {
						// Save the field to the post with the default value
						update_field($name,$default,$post_id);
					}
				}
			}
		}
	}
}